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薇薇 发布了文章 · 7月22日

position:fixed基于父元素定位

position: fixed
是基于浏览器进行定位的
想设置基于父元素定位,需要给父元素设置样式
transform:translate(0)
也可以给父元素上级,上上级....在该元素上层就可以,亲测有效。

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薇薇 发布了文章 · 7月21日

vue项目拖动实现修改左右宽度

需求:拖动实现改变左右宽度
实现效果:
9p3z0-kt94e.gif

实现步骤:
1.代码

 <div class="box" ref="box">
    <div class='left'>左侧</div>
    <div class="resize" title="收缩侧边栏">
        ⋮
    </div>
    <div class='right'>右侧</div>
</div>

2.样式

.left {
    width: 49.2%;
    height:100%;
    overflow-y:auto;
    overflow-x:hidden;
    float: left;
}
.resize {
    cursor: col-resize;
    float: left;
    position: relative;
    top: 45%;
    background-color: #d6d6d6;
    border-radius: 5px;
    width: 0.6%;
    height: 50px;
    line-height: 50px;
    text-align: center;
    background-size: cover;
    background-position: center;
    font-size: 0.32rem;
    color: white;
}
/*拖拽区鼠标悬停样式*/
.resize:hover {
    color: #444444;
}
.right {
    height:7.8rem;
    float: left;
    width:50%;
}
.box {
    width: 100%;
    height: 7.8rem;
}

3.方法

dragControllerDiv: function () {
    var resize = document.getElementsByClassName('resize');
    var left = document.getElementsByClassName('left');
    var mid = document.getElementsByClassName('right');
    var box = document.getElementsByClassName('box');
    for (let i = 0; i < resize.length; i++) {
        // 鼠标按下事件
        resize[i].onmousedown = function (e) {
            //颜色改变提醒
            resize[i].style.background = '#818181';
            var startX = e.clientX;
            // 鼠标拖动事件
            document.onmousemove = function (e) {
                resize[i].left = startX;
                var endX = e.clientX;
                var moveLen = resize[i].left + (endX - startX); // (endx-startx)=移动的距离。resize[i].left+移动的距离=左边区域最后的宽度
                var maxT = box[i].clientWidth - resize[i].offsetWidth; // 容器宽度 - 左边区域的宽度 = 右边区域的宽度
                if (moveLen < 32) moveLen = 32; // 左边区域的最小宽度为32px
                if (moveLen > maxT - 150) moveLen = maxT - 150; //右边区域最小宽度为150px
                resize[i].style.left = moveLen; // 设置左侧区域的宽度
                for (let j = 0; j < left.length; j++) {
                    left[j].style.width = (moveLen/document.body.clientWidth)*100 + '%';
                    mid[j].style.width = ((box[i].clientWidth - moveLen)/document.body.clientWidth - 0.008)*100 + '%';
                }
            };
            // 鼠标松开事件
            document.onmouseup = function (evt) {
                //颜色恢复
                resize[i].style.background = '#d6d6d6';
                document.onmousemove = null;
                document.onmouseup = null;
                resize[i].releaseCapture && resize[i].releaseCapture(); //当你不在需要继续获得鼠标消息就要应该调用ReleaseCapture()释放掉
            };
            resize[i].setCapture && resize[i].setCapture(); //该函数在属于当前线程的指定窗口里设置鼠标捕获
            return false;
        };
    }
},

4.实现

mounted: function () {
    let me=this;
    me.dragControllerDiv();
}

参考文章:https://www.cnblogs.com/ingri...
将不断更新完善,期待您的批评指正!

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薇薇 发布了文章 · 6月22日

全国经纬度json文件

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薇薇 发布了文章 · 5月21日

vue项目干货,继续完善

总有一个功能,你会用的到!
接上篇文章:vue项目干货
源码地址

15.关于echarts图表及随区域大小变化resize

创建lineChart组件,折线图表
image.png
代码如下:

<template>
    <div :id="srcData.id" class="warnCount"></div>
</template>
<script>
    import echarts from 'echarts';
    import resize from '../resize' //用于可视区域改变时resize
    export default {
        name: "chart",
        mixins: [resize],
        data() {
            return {
                chartColumn: null,
                scale: 1,
            }
        },
        props: {
            srcData: Object, //数据
            isGetData: Boolean  //获取好数据 可以开始绘制标记
        },
        watch: {
            isGetData(val) {
                this.drawChart();
            }
        },
        methods: {
            drawChart() {
                let me=this;
                setTimeout(() => {
                    let me = this;
                    this.chartColumn.clear();
                    this.chartColumn.setOption({
                        tooltip: {
                            trigger: 'axis',
                            confine: true
                        },
                        yAxis: {
                            name: '得分',
                            type: 'value',
                            axisLine: {
                                lineStyle: {
                                    color: '#72aafa'
                                },
                            },
                            splitLine: {
                                show:false,
                                lineStyle: {
                                    color: '#154d5a',
                                    width: 0.5
                                }
                            },
                        },
                        xAxis :{
                            type: 'time',
                            splitLine: {
                                show: false,
                                lineStyle: {
                                    color: '#72aafa',
                                    
                                }
                            },
                            axisLine: {
                                lineStyle: {
                                    color: '#72aafa'
                                }
                            },
                            
                        },
                        grid:{
                            top:'15%',
                            right:'10%',
                            left:'10%',
                            bottom:'15%'
                        },
                        series:this.srcData.sData
                    })
                }, 0);
            }
        },
        created() {
            var me = this;
        },
        updated() {
        },
        mounted() {
            let charDom = document.getElementById(this.srcData.id), me = this;
            charDom.style.height = this.srcData.height + "px";
            this.scale = window.innerWidth / 1920;
            this.chartColumn = echarts.init(charDom);
            this.chartColumn.on('click', function (params) {
                me.$emit('click', params);
            })
        },
        beforeDestroy() {
            if (this.chartColumn) {
                this.chartColumn.clear()
            }
        },
        destroy() {
            if (this.chartColumn) {
                this.chartColumn.dispose()
                this.chartColumn = null;
            }
        },
        components: {}
    }
</script>
<style scoped lang="scss">
    .warnCount {
        width: 100%;
        height: 350px;
    }
</style>

接下来开始使用该组件:
image.png
传值:

warnCountTrendData: {
    id: 'warnCountTrend',
    height: 350,
    sData:[
        {
            name:'竞逐对',
            symbol:'circle',
            symbolSize:6,
            type:'line',
            lineStyle:{
                width:1
            },
            data:[
                {value:["2020-01-01 00:00:00",0]},
                {value:["2020-01-02 00:00:00",0]},
                {value:["2020-01-04 01:01:01",200]},
                {value:["2020-01-07 01:01:01",200]}

            ]
        },
        {
            name:'竞逐对1',
            symbol:'circle',
            symbolSize:6,
            type:'line',
            lineStyle:{
                width:1
            },
            data:[
                {value:["2020-01-02 00:00:00",0]},
                {value:["2020-01-06 04:01:00",100]},
                {value:["2020-01-07 01:01:01",200]}
            ]
        }
    ]
}

当窗口改变时window.onresize可以被监听到,但当导航栏收起时监听不到,此项目的解决方案是安装:element-resize-detector
resize.js文件:

import {debounce} from '../common/util';
import elementResizeDetectorMaker from 'element-resize-detector'
export default {
    data() {
        return {
            $_sidebarElm: null
        }
    },
    mounted() {
        let me=this;
        this.__resizeHandler = debounce(() => {
            if (this.chartColumn) {
                this.chartColumn.resize()
            }
        }, 100)
        window.addEventListener('resize', this.__resizeHandler);
        const erd = elementResizeDetectorMaker()
        erd.listenTo(document.getElementsByClassName("contentBox"),(element)=>{
           me.$nextTick(()=>{
                me.resize()
            })
        })
    },
    beforeDestroy() {
        window.removeEventListener('resize', this.__resizeHandler);
    },
    methods: {
        resize() {
            this.__resizeHandler()
        }
    }
}

debounce为函数防抖方法:

export const debounce = (func, wait, immediate) => {
    let timeout, args, context, timestamp, result

    const later = function () {
        // 据上一次触发时间间隔
        const last = +new Date() - timestamp

        // 上次被包装函数被调用时间间隔 last 小于设定时间间隔 wait
        if (last < wait && last > 0) {
            timeout = setTimeout(later, wait - last)
        } else {
            timeout = null
            // 如果设定为immediate===true,因为开始边界已经调用过了此处无需调用
            if (!immediate) {
                result = func.apply(context, args)
                if (!timeout) context = args = null
            }
        }
    }

    return function (...args) {
        context = this
        timestamp = +new Date()
        const callNow = immediate && !timeout
        // 如果延时不存在,重新设定延时
        if (!timeout) timeout = setTimeout(later, wait)
        if (callNow) {
            result = func.apply(context, args)
            context = args = null
        }

        return result
    }
}

实现效果:

16.抽屉

通过drawer控制抽屉展示隐藏
image.png

<el-button @click="showDrawer" type="primary" class='showBtn' :style='sty'>
        <i class='iconfont iconshezhi' v-if='!drawer'></i>
        <i class='iconfont iconguanbi' v-else></i>
    </el-button>
    <el-drawer  :visible.sync="drawer" direction="rtl" style='position:absolute' @close='onClose'>
    <span class='drawTitle'>设置</span>
    <div style='margin:0 auto;width:100%;'>
        <el-form ref="form" label-width="80px">
            <el-form-item label="选择主题">
                <el-select v-model="value" placeholder="请选择" @change='changeColor'>
                    <el-option
                    v-for="item in options"
                    :key="item.value"
                    :label="item.label"
                    :value="item.value">
                    </el-option>
                </el-select>
            </el-form-item>
        </el-form>
    </div>
</el-drawer>

再来控制控制按钮的样式:

.showBtn {
    position:absolute;
    top:50%;
    transform :translateY(-50%);
    z-index:100000;
    transition: right .3s;
    padding:10px!important;
    i {
        font-size:20px;
    }
}
.drawTitle {
    position: absolute;
    top: 4%;
    left: 5%;
    font-weight: 700;
    color: #666;
    font-size: 17px;
}

方法逻辑:

showDrawer:function(){
    let me=this;
    me.drawer = !me.drawer;
    me.value=sessionStorage.getItem('theme');
    me.sty.right=me.drawer?'30%':'0' //按钮位置
},
onClose:function(){
    let me=this;
    me.sty.right='0'
}

实现效果:
image.png

17.换肤功能

增加如下两个文件(需安装sass)
image.png
mixin.scss

@mixin get-theme-value($type, $value, $css-key, $css-value) {
    @each $themename , $theme in $themes {
        [data-theme = '#{$themename}'] & {
            $_type: map-get($theme, $type);
            #{$css-key}: #{$css-value} map-get($_type , $value );
        }
    }
}

@mixin get-color-value($type, $value) {
    @each $themename , $theme in $themes {
        [data-theme = '#{$themename}'] & {
            $_type: map-get($theme, $type);
            #{$type}-color: map-get($_type , $value );
        }
    }
}

@mixin background($color){
    @include get-theme-value('background', $color, 'background', '');
}
@mixin background-color($color){
    @include get-color-value('background', $color);
}

@mixin font-color($color) {
    @include get-theme-value('font', $color, 'color', '');
}

@mixin border-color($color) {
    @include get-color-value('border', $color);
}
@mixin border($color, $css-key:'border', $css-value:'1px solid') {
    @include get-theme-value('border', $color,  $css-key , $css-value)
}

@mixin box-shadow($color, $css-value) {
    @include get-theme-value('boxShadow', $color, 'box-shadow', $css-value)
}
@mixin common-link-font($size: 1.2) {
    font-size: #{$size}rem; font-weight: 600;
    &:hover,
    &.selected{
        @include font-color('color4');
    }
    @include font-color('color1');
}
@mixin common-font($size: 1.2, $font-weight: 400) {
    font-size: #{$size}rem; font-weight: $font-weight;
    @include font-color('color1');
}

@mixin flex($justify: flex-start, $align-items: center, $dir: row, $wrap: nowrap, $align-content: stretch) {
  display: flex;
  flex-flow: $dir $wrap;
  justify-content: $justify;
  align-items: $align-items;
  align-content: $align-content;
}

theme.css 定义两套主题

@import './mixin.scss';
// default theme

$default-theme : (
  font: (
    color1: #16284c,
  ),
  border: (
    color1: #16284c,
  ),
  background: (
    color1: #16284c,
  ),
  boxShadow: (
    color1: rgba(0,0,0,.3)
  )
);

//红色主题
$red-theme : (
  font: (
    color1: red
  ),
  border: (
    color1: red
  ),
  background: (
    color1: red
  ),
  boxShadow: (
    color1: rgba(0,0,0,.3)
  )
);

$themes: (
  default-theme: $default-theme,
  red-theme: $red-theme
);

App.vue

<template>
    <div id="app">
        <transition name="fade" mode="out-in">
            <router-view></router-view>
        </transition>
    </div>
</template>
<script>
    export default {
        name: 'app',
        data(){
          return {
              getNowThemeInfo:'' //初始主题
          }
        },
        mounted() {
          let me=this;  
          me.getNowThemeInfo=sessionStorage.getItem('theme');
          me.setBodyTheme();
          
        },
        methods: {
            setBodyTheme() {
                document.body.dataset.theme = this.getNowThemeInfo;
            }
        },
        components: {}
    }

</script>

<style lang="scss">
    body {
        margin: 0px;
        padding: 0px;
        /*background: url(assets/bg1.jpg) center !important;
            background-size: cover;*/
        // background: #1F2D3D;
        font-family: Helvetica Neue, Helvetica, PingFang SC, Hiragino Sans GB, Microsoft YaHei, SimSun, sans-serif;
        font-size: 14px;
        -webkit-font-smoothing: antialiased;
    }

    #app {
        position: absolute;
        top: 0px;
        bottom: 0px;
        width: 100%;
    }

    .el-submenu [class^=fa] {
        vertical-align: baseline;
        margin-right: 10px;
    }

    .el-menu-item [class^=fa] {
        vertical-align: baseline;
        margin-right: 10px;
    }

    .toolbar {
        background: #f2f2f2;
        padding: 10px;
        //border:1px solid #dfe6ec;
        margin: 10px 0px;
        .el-form-item {
            margin-bottom: 10px;
        }
    }

    .fade-enter-active,
    .fade-leave-active {
        transition: all .2s ease;
    }

    .fade-enter,
    .fade-leave-active {
        opacity: 0;
    }
</style>

当某个元素的颜色信息需要随主题改变时,需要这样定义颜色信息
image.png
你会发现浏览器中样式使这样写的
image.png
基本换肤功能就实现了,下面介绍下如何切换(此项目将主题信息存储在session中)
main.js中增加如下方法,监听session

Vue.prototype.resetSetItem = function (key, newVal) {
  if (key =='theme') {
      // 创建一个StorageEvent事件
      var newStorageEvent = document.createEvent('StorageEvent');
      const storage = {
          setItem: function (k, val) {
              sessionStorage.setItem(k, val);
              // 初始化创建的事件
              newStorageEvent.initStorageEvent('setItem', false, false, k, null, val, null, null);
              // 派发对象
              window.dispatchEvent(newStorageEvent)
          }
      }
      return storage.setItem(key, newVal);
  }
}

在app.vue中监听变化

window.addEventListener('setItem', ()=> {
    var val = sessionStorage.getItem('theme');
    console.log(val);
    this.getNowThemeInfo=sessionStorage.getItem('theme');
    this.setBodyTheme();
})

在改变主题信息时记得存session里theme
录屏工具打不开了...效果先看项目吧

将不断更新完善,期待您的批评指正!

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薇薇 发布了文章 · 5月15日

高德地图实现(附案例)

需求:基于高德地图实现地图展示
实现步骤:
1.首先注册登录并创建一个应用
image.png

2.创建应用后添加key,获取key值。此案例为web端(JS)
image.png

3.引入

<script type="text/javascript" data-original="https://webapi.amap.com/maps?v=1.4.15&key=您申请的key值"></script>

4.添加div标签作为地图容器,同时为该div指定id属性;
并通过css定义宽高。

<div id="container"></div>
#container {
    width:300px; height: 180px; 
}

5.创建地图

window.onLoad  = function(){
    var map = new AMap.Map('container', {
        zoom:6,//级别
        center: [116.397428, 39.90923],//中心点坐标
        pitch:45,//视角
        viewMode: '3D',//开启3D视图,默认为关闭
        resizeEnable: true, //是否监控地图容器尺寸变化
        features: ["bg", "road", "point"], //隐藏默认楼块
        mapStyle: "amap://styles/3484ce5283d8486fa3df43a67cecb8e0", //设置地图的显示样式
    });          
}
var url = 'https://webapi.amap.com/maps?v=1.4.15&key=你得key&callback=onLoad';
var jsapi = document.createElement('script');
jsapi.charset = 'utf-8';
jsapi.src = url;
document.head.appendChild(jsapi);

6.mapStyle为在线上定义好的样式
https://lbs.amap.com/dev/maps...
定义好后上传,然后把地址写上就可以啦

7.地图标点
image.png
数据:

location_data: [  // 地图标点
    {
      "name": "应用企业1",  // 企业名称
      "alert_num": 5555,  // 告警数量
      "info": {
          "location": "xxx",  // 企业地址
          "coord": [118.88, 28.97],
          "contact": {
              "name": "xx",  // 联系人
              "phone": "15022222222"  // 手机号
          }
      }
    },
    {
      "name": "应用企业1",
      "alert_num": 555,
      "info": {
          "location": "xxx",
          "coord": [116.7, 39.53],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    },
    {
      "name": "应用企业1",
      "alert_num": 55,
      "info": {
          "location": "xxx",
          "coord": [115.480656, 35.23375],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    },
    {
      "name": "应用企业1",
      "alert_num": 112,
      "info": {
          "location": "xxx",
          "coord": [117.27, 31.86],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    },
    {
      "name": "武汉钢铁(集团)公司",
      "alert_num": 332,
      "info": {
          "location": "xxx",
          "coord": [86.06,41.68],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    },
   {
      "name": "鞍山钢铁集团有限公司",
      "alert_num": 222,
      "info": {
          "location": "xxx",
          "coord": [125.03, 46.58],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    },
    {
      "name": "唐山钢铁有限公司",
      "alert_num": 444,
      "info": {
          "location": "xxx",
          "coord": [111.65,40.82],
          "contact": {
              "name": "xx",
              "phone": "15022222222"
          }
      }
    }
]

实现效果:
image.png

8.点击展示弹框
image.png

marker.on('click', function (ev) {
    // 信息窗体的内容
    this.infoWin = new AMap.InfoWindow({
        autoMove: false,
        isCustom: true,  //使用自定义窗体
        offset: new AMap.Pixel(10, -10),
        content:'<div class="name">'+me.location_data[i].name+'</div>'
    });
    var x = ev.pixel.x;
    var y = ev.pixel.y;
    var lngLat = map.containerToLngLat(new AMap.Pixel(x, y));
    this.infoWin.open(map, lngLat);
});

实现效果:
image.png
源码地址:https://github.com/myweiwei/vue-
此项目其他功能可参考:https://segmentfault.com/a/11...

将不断更新完善,期待您的批评指正!

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薇薇 回答了问题 · 5月11日

element-ui el-menu 折叠时 子菜单弹框点两次才会隐藏

https://segmentfault.com/a/11... 这篇文章有详细使用说明及源码,可供参考

关注 5 回答 4

薇薇 发布了文章 · 5月9日

纯js实现图片滑块验证

需求:js实现滑块验证
思路:设置position:absolute,通过left值控制滑动

再来说几个js事件:
onmousedown
事件会在鼠标按键被按下时发生
onmousemove
事件会在鼠标指针移动时发生
onmouseup
事件会在鼠标松开时发生

实现:

//完成图片及滑块的摆放
<div class='box'>
    <img data-original="./timg.jpg" alt="" class='img'>
    <img data-original="./nose.png" alt="" class='inner'>
</div>
<div class="drag">
    <div class="bg"></div>
    <div class="text" onselectstart="return false;">请拖动滑块解锁</div>
    <div class="btn">&gt;&gt;</div>
</div>

及样式:

        .box {
            width: 311px;
            height:155px;
            margin:0 auto;
            position:relative;
        }
        .inner {
            position:absolute;
            left:0;
        }
        .drag{
            width: 311px;
            height: 40px;
            line-height: 40px;
            background-color: #e8e8e8;
            position: relative;
            margin:0 auto;
        }
        .bg{
            width:40px;
            height: 100%;
            position: absolute;
            background-color: #75CDF9;
        }
        .text{
            position: absolute;
            width: 100%;
            height: 100%;
            text-align: center;
            user-select: none;
        }
        .btn{
            width:40px;
            height: 38px;
            position: absolute;
            border:1px solid #ccc;
            cursor: move;
            font-family: "宋体";
            text-align: center;
            background-color: #fff;
            user-select: none;
            color:#666;
        }

写完后是这样滴:
image.png

接下来写事件:
首先获取滑动键被点了

btn.onmousedown = function(e){
    var e = e || window.event;
    //鼠标点的位置
    var downX = e.clientX;
}

监听移动事件(写在点击方法里面,这里为了方便介绍,可下载源码):

document.onmousemove = function(e){
    var e = e || window.event;
    //获取鼠标移动后的水平位置
    var moveX = e.clientX;
    //获取移动了多少
    offsetX = moveX - downX;
    //防止越界
    if( offsetX > distance){
        offsetX = distance;//如果滑过了终点,就将它停留在终点位置
    }else if( offsetX < 0){
        offsetX = 0;//如果滑到了起点的左侧,就将它重置为起点位置
    }
    //根据移动距离让按钮,小图片及背景色动起来
    按钮.style.left = offsetX + "px";
    背景.style.width = offsetX + "px";
    小图.style.left=offsetX + "px";
}

然后通过移动距离和需要的距离做对比,获取状态。

if( offsetX == "目标"){
    //1.设置滑动成功后的样式
    text.innerHTML = "";
    text.style.color = "#fff";
    btn.innerHTML = "&radic;";
    btn.style.color = "green";
    bg.style.backgroundColor = "lightgreen";
    success=true;
    //2.成功后,清除掉鼠标按下事件和移动事件(因为移动时并不会涉及到鼠标松开事件)
    btn.onmousedown = null;
    document.onmousemove = null;
    //3.成功解锁后的回调函数
    setTimeout(function(){
        alert('解锁成功!');
    },100);
}

当鼠标松开时:

       document.onmouseup = function(e){
        //如果鼠标的水平移动距离 = 滑动成功的宽度
        if( success){
           return;
        }else{
            //反之,则将滑块复位(设置了1s的属性过渡效果)
            btn.style.left = 0;
            bg.style.width = 0;
            inner.style.left=0;
            btn.style.transition = "left 1s ease";
            inner.style.transition = "left 1s ease";
            bg.style.transition = "width 1s ease";
        }
        //只要鼠标松开了,说明此时不需要拖动滑块了,那么就清除鼠标移动和松开事件。
        document.onmousemove = null;
        document.onmouseup = null;
    }

image.png
大体实现思路就这些啦!
源码地址:https://github.com/myweiwei/S...
将不断更新完善,期待您的批评指正!

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薇薇 赞了文章 · 5月3日

JavaScript+Canvas实现自定义画板

最近研究了HTML5一些新的元素属性,发现确实好用,特别是里面的Canvas这个新的标签元素。官方介绍:Canvas API(画布)是在HTML5中新增的标签用于在网页实时生成图像,并且可以操作图像内容,基本上它是一个可以用JavaScript操作的位图(bitmap)。以下使用JavaScript结合Canvas实现一个画板功能

效果演示图:

代码部分(直接复制便可使用)

<!DOCTYPE HTML>  
<html>  
<head>  
<meta charset="utf-8" >  
<title>JavaScript+Canvas实现自定义画板</title>  
</head>  
<body>  
<canvas id="canvas"  width="600" height="300"></canvas>  
<script type="text/javascript">  
   var canvas = document.getElementById("canvas");  
   var ctx = canvas.getContext("2d");  
   //画一个黑色矩形  
   ctx.fillStyle="black";  
   ctx.fillRect(0,0,600,300);  
   //按下标记  
   var onoff = false;  
   //变量oldx跟oldy代表鼠标移动前的坐标  
   var oldx = -10;  
   var oldy = -10;  
   //设置颜色  
   var linecolor = "white";  
   //设置线宽  
   var linw = 4;  
   //添加鼠标移动事件  
   canvas.addEventListener("mousemove",draw,true);  //第三个参数主要跟捕获或者冒泡有关  
   //添加鼠标按下事件  
   canvas.addEventListener("mousedown",down,false);  
   //添加鼠标弹起事件  
   canvas.addEventListener("mouseup",up,false);  
   function down(event){  
     onoff = true;  
     oldx = event.pageX-10;   
     oldy = event.pageY-10;  
  //console.log(event.pageX+'..............000.............'+event.pageY);  
//event.pageX跟event.pageY相对于整个页面鼠标的位置 包括溢出的部分(就是滚动条)  
  
   }  
  
   function up(){  
     onoff = false;  
   }  
  
   function draw(event){  
     if(onoff == true){   
       var newx = event.pageX-10;   
       var newy = event.pageY-10;   
       ctx.beginPath();//beginPath() 丢弃任何当前定义的路径并且开始一条新的路径。它把当前的点设置为 (0,0)。  
       ctx.moveTo(oldx,oldy);   //移动到点击时候的坐标,以那个坐标为原点  
       ctx.lineTo(newx,newy);   //绘制新的路径  
       ctx.strokeStyle=linecolor;  
       ctx.lineWidth=linw;  
       ctx.lineCap="round";  
       ctx.stroke();//stroke() 方法会实际地绘制出通过 moveTo() 和 lineTo() 方法定义的路径。默认颜色是黑色。  
    //将新的鼠标位置赋给下一次开始绘制的起始坐标  
       oldx = newx;  
       oldy = newy;  
    };  
 };  
</script>  
</body>  
</html>

最后

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薇薇 发布了文章 · 5月2日

微信小程序animation实现列表滑动展示效果

需求:
实现如下效果
20200502_233357.gif

实现:
定义参数

option:{
    duration: 100, // 动画执行时间
    timingFunction: 'ease-in'  // 动画执行效果
}

定义animation
image.png

设置初始不展示:

.commonInner {
    height:0;
    overflow:  hidden;
}

展开方法:

open:function(){
    let me=this;
    var box = wx.createAnimation(me.data.option);//初始化animation
    let hei=40*4;//可设置动态获取高度
    box.height(hei).step();//设置动画效果
    me.setData({
        inner: box.export(),
        openFlag:true//判断当前状态(展开/收起)
    })
}

收起方法:

close: function () {
    let me = this;
    var box = wx.createAnimation(me.data.option);
    box.height(0).step();
    me.setData({
        inner: box.export(),
        openFlag: false
    })
}

代码地址: https://github.com/myweiwei/s...
将不断更新完善,期待您的批评指正!

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薇薇 赞了文章 · 5月2日

「面试题」20+Vue面试题整理

6841583658006_.pic.jpg

从镜片的厚度和黄黑相见的格子衬衫我察觉到,面前坐着的这位面试官应该是来者不善。

我像以往一样,准备花3分钟的时间进行自我介绍。在此期间,为了避免尴尬,我盯着面试官的眉毛中间,不过面试官明显对我的经历不是很感兴趣。他在1分半的时候打断了我。

你觉得自己最擅长的技术栈是什么?

Vue吧,我很喜欢尤大,最近刚发布了Vue的首部纪录片,真的很好看。

0.那你能讲一讲MVVM吗?

MVVM是Model-View-ViewModel缩写,也就是把MVC中的Controller演变成ViewModel。Model层代表数据模型,View代表UI组件,ViewModel是View和Model层的桥梁,数据会绑定到viewModel层并自动将数据渲染到页面中,视图变化的时候会通知viewModel层更新数据。

1.简单说一下Vue2.x响应式数据原理

Vue在初始化数据时,会使用Object.defineProperty重新定义data中的所有属性,当页面使用对应属性时,首先会进行依赖收集(收集当前组件的watcher)如果属性发生变化会通知相关依赖进行更新操作(发布订阅)。

2.那你知道Vue3.x响应式数据原理吗?

(还好我有看,这个难不倒我)

Vue3.x改用Proxy替代Object.defineProperty。因为Proxy可以直接监听对象和数组的变化,并且有多达13种拦截方法。并且作为新标准将受到浏览器厂商重点持续的性能优化。

Proxy只会代理对象的第一层,那么Vue3又是怎样处理这个问题的呢?

(很简单啊)

判断当前Reflect.get的返回值是否为Object,如果是则再通过reactive方法做代理,
这样就实现了深度观测。

监测数组的时候可能触发多次get/set,那么如何防止触发多次呢?

我们可以判断key是否为当前被代理对象target自身属性,也可以判断旧值与新值是否相等,只有满足以上两个条件之一时,才有可能执行trigger。

面试官抬起了头。心里暗想

(这小子还行,比上两个强,应该是多多少少看过Vue3的源码了)

3.再说一下vue2.x中如何监测数组变化

使用了函数劫持的方式,重写了数组的方法,Vue将data中的数组进行了原型链重写,指向了自己定义的数组原型方法。这样当调用数组api时,可以通知依赖更新。如果数组中包含着引用类型,会对数组中的引用类型再次递归遍历进行监控。这样就实现了监测数组变化。

(能问到这的面试官都比较注重深度,这些常规操作要记牢)

(原型链的细节可以参考我的另一篇专栏)

一文带你彻底搞懂JavaScript原型链

4.nextTick知道吗,实现原理是什么?

在下次 DOM 更新循环结束之后执行延迟回调。nextTick主要使用了宏任务和微任务。根据执行环境分别尝试采用

  • Promise
  • MutationObserver
  • setImmediate
  • 如果以上都不行则采用setTimeout

定义了一个异步方法,多次调用nextTick会将方法存入队列中,通过这个异步方法清空当前队列。

(关于宏任务和微任务以及事件循环可以参考我的另两篇专栏)

(看到这你就会发现,其实问框架最终还是考验你的原生JavaScript功底)

浏览器中JavaScript的事件循环

Node.js事件循环

5.说一下Vue的生命周期

beforeCreate是new Vue()之后触发的第一个钩子,在当前阶段data、methods、computed以及watch上的数据和方法都不能被访问。

created在实例创建完成后发生,当前阶段已经完成了数据观测,也就是可以使用数据,更改数据,在这里更改数据不会触发updated函数。可以做一些初始数据的获取,在当前阶段无法与Dom进行交互,如果非要想,可以通过vm.$nextTick来访问Dom。

beforeMount发生在挂载之前,在这之前template模板已导入渲染函数编译。而当前阶段虚拟Dom已经创建完成,即将开始渲染。在此时也可以对数据进行更改,不会触发updated。

mounted在挂载完成后发生,在当前阶段,真实的Dom挂载完毕,数据完成双向绑定,可以访问到Dom节点,使用$refs属性对Dom进行操作。

beforeUpdate发生在更新之前,也就是响应式数据发生更新,虚拟dom重新渲染之前被触发,你可以在当前阶段进行更改数据,不会造成重渲染。

updated发生在更新完成之后,当前阶段组件Dom已完成更新。要注意的是避免在此期间更改数据,因为这可能会导致无限循环的更新。

beforeDestroy发生在实例销毁之前,在当前阶段实例完全可以被使用,我们可以在这时进行善后收尾工作,比如清除计时器。

destroyed发生在实例销毁之后,这个时候只剩下了dom空壳。组件已被拆解,数据绑定被卸除,监听被移出,子实例也统统被销毁。

(关于Vue的生命周期详解感兴趣的也请移步我的另一篇专栏)

从源码解读Vue生命周期,让面试官对你刮目相看

6.你的接口请求一般放在哪个生命周期中?

接口请求一般放在mounted中,但需要注意的是服务端渲染时不支持mounted,需要放到created中。

7.再说一下Computed和Watch

Computed本质是一个具备缓存的watcher,依赖的属性发生变化就会更新视图。
适用于计算比较消耗性能的计算场景。当表达式过于复杂时,在模板中放入过多逻辑会让模板难以维护,可以将复杂的逻辑放入计算属性中处理。

Watch没有缓存性,更多的是观察的作用,可以监听某些数据执行回调。当我们需要深度监听对象中的属性时,可以打开deep:true选项,这样便会对对象中的每一项进行监听。这样会带来性能问题,优化的话可以使用字符串形式监听,如果没有写到组件中,不要忘记使用unWatch手动注销哦。

8.说一下v-if和v-show的区别

当条件不成立时,v-if不会渲染DOM元素,v-show操作的是样式(display),切换当前DOM的显示和隐藏。

9.组件中的data为什么是一个函数?

一个组件被复用多次的话,也就会创建多个实例。本质上,这些实例用的都是同一个构造函数。如果data是对象的话,对象属于引用类型,会影响到所有的实例。所以为了保证组件不同的实例之间data不冲突,data必须是一个函数。

10.说一下v-model的原理

v-model本质就是一个语法糖,可以看成是value + input方法的语法糖。
可以通过model属性的propevent属性来进行自定义。原生的v-model,会根据标签的不同生成不同的事件和属性。

11.Vue事件绑定原理说一下

原生事件绑定是通过addEventListener绑定给真实元素的,组件事件绑定是通过Vue自定义的$on实现的。

面试官:(这小子基础还可以,接下来我得上上难度了)

12.Vue模版编译原理知道吗,能简单说一下吗?

简单说,Vue的编译过程就是将template转化为render函数的过程。会经历以下阶段:

  • 生成AST树
  • 优化
  • codegen

首先解析模版,生成AST语法树(一种用JavaScript对象的形式来描述整个模板)。
使用大量的正则表达式对模板进行解析,遇到标签、文本的时候都会执行对应的钩子进行相关处理。

Vue的数据是响应式的,但其实模板中并不是所有的数据都是响应式的。有一些数据首次渲染后就不会再变化,对应的DOM也不会变化。那么优化过程就是深度遍历AST树,按照相关条件对树节点进行标记。这些被标记的节点(静态节点)我们就可以跳过对它们的比对,对运行时的模板起到很大的优化作用。

编译的最后一步是将优化后的AST树转换为可执行的代码

面试官:(精神小伙啊,有点东西,难度提升,不信难不倒你)

13.Vue2.x和Vue3.x渲染器的diff算法分别说一下

简单来说,diff算法有以下过程

  • 同级比较,再比较子节点
  • 先判断一方有子节点一方没有子节点的情况(如果新的children没有子节点,将旧的子节点移除)
  • 比较都有子节点的情况(核心diff)
  • 递归比较子节点

正常Diff两个树的时间复杂度是O(n^3),但实际情况下我们很少会进行跨层级的移动DOM,所以Vue将Diff进行了优化,从O(n^3) -> O(n),只有当新旧children都为多个子节点时才需要用核心的Diff算法进行同层级比较。

Vue2的核心Diff算法采用了双端比较的算法,同时从新旧children的两端开始进行比较,借助key值找到可复用的节点,再进行相关操作。相比React的Diff算法,同样情况下可以减少移动节点次数,减少不必要的性能损耗,更加的优雅。

Vue3.x借鉴了
ivi算法和 inferno算法

在创建VNode时就确定其类型,以及在 mount/patch 的过程中采用位运算来判断一个VNode的类型,在这个基础之上再配合核心的Diff算法,使得性能上较Vue2.x有了提升。(实际的实现可以结合Vue3.x源码看。)

该算法中还运用了动态规划的思想求解最长递归子序列。

(看到这你还会发现,框架内无处不蕴藏着数据结构和算法的魅力)

面试官:(可以可以,看来是个苗子,不过自我介绍属实有些无聊,下一题)

(基操,勿6)

14.再说一下虚拟Dom以及key属性的作用

由于在浏览器中操作DOM是很昂贵的。频繁的操作DOM,会产生一定的性能问题。这就是虚拟Dom的产生原因

Vue2的Virtual DOM借鉴了开源库snabbdom的实现。

Virtual DOM本质就是用一个原生的JS对象去描述一个DOM节点。是对真实DOM的一层抽象。(也就是源码中的VNode类,它定义在src/core/vdom/vnode.js中。)

VirtualDOM映射到真实DOM要经历VNode的create、diff、patch等阶段。

key的作用是尽可能的复用 DOM 元素。

新旧 children 中的节点只有顺序是不同的时候,最佳的操作应该是通过移动元素的位置来达到更新的目的。

需要在新旧 children 的节点中保存映射关系,以便能够在旧 children 的节点中找到可复用的节点。key也就是children中节点的唯一标识。

15.keep-alive了解吗

keep-alive可以实现组件缓存,当组件切换时不会对当前组件进行卸载。

常用的两个属性include/exclude,允许组件有条件的进行缓存。

两个生命周期activated/deactivated,用来得知当前组件是否处于活跃状态。

keep-alive的中还运用了LRU(Least Recently Used)算法。

(又是数据结构与算法,原来算法在前端也有这么多的应用)

16.Vue中组件生命周期调用顺序说一下

组件的调用顺序都是先父后子,渲染完成的顺序是先子后父

组件的销毁操作是先父后子,销毁完成的顺序是先子后父

加载渲染过程

父beforeCreate->父created->父beforeMount->子beforeCreate->子created->子beforeMount- >子mounted->父mounted

子组件更新过程

父beforeUpdate->子beforeUpdate->子updated->父updated

父组件更新过程

父 beforeUpdate -> 父 updated

销毁过程

父beforeDestroy->子beforeDestroy->子destroyed->父destroyed

17.Vue2.x组件通信有哪些方式?

  • 父子组件通信

    父->子props,子->父 $on、$emit

    获取父子组件实例 $parent、$children

    Ref 获取实例的方式调用组件的属性或者方法

    Provide、inject 官方不推荐使用,但是写组件库时很常用

  • 兄弟组件通信

    Event Bus 实现跨组件通信 Vue.prototype.$bus = new Vue

    Vuex

  • 跨级组件通信

    Vuex

    $attrs、$listeners

    Provide、inject

18.SSR了解吗?

SSR也就是服务端渲染,也就是将Vue在客户端把标签渲染成HTML的工作放在服务端完成,然后再把html直接返回给客户端

SSR有着更好的SEO、并且首屏加载速度更快等优点。不过它也有一些缺点,比如我们的开发条件会受到限制,服务器端渲染只支持beforeCreatecreated两个钩子,当我们需要一些外部扩展库时需要特殊处理,服务端渲染应用程序也需要处于Node.js的运行环境。还有就是服务器会有更大的负载需求。

19.你都做过哪些Vue的性能优化?

编码阶段

  • 尽量减少data中的数据,data中的数据都会增加getter和setter,会收集对应的watcher
  • v-if和v-for不能连用
  • 如果需要使用v-for给每项元素绑定事件时使用事件代理
  • SPA 页面采用keep-alive缓存组件
  • 在更多的情况下,使用v-if替代v-show
  • key保证唯一
  • 使用路由懒加载、异步组件
  • 防抖、节流
  • 第三方模块按需导入
  • 长列表滚动到可视区域动态加载
  • 图片懒加载

SEO优化

  • 预渲染
  • 服务端渲染SSR

打包优化

  • 压缩代码
  • Tree Shaking/Scope Hoisting
  • 使用cdn加载第三方模块
  • 多线程打包happypack
  • splitChunks抽离公共文件
  • sourceMap优化

用户体验

  • 骨架屏
  • PWA

还可以使用缓存(客户端缓存、服务端缓存)优化、服务端开启gzip压缩等。

(优化是个大工程,会涉及很多方面,这里申请另开一个专栏)

20.hash路由和history路由实现原理说一下

location.hash的值实际就是URL中#后面的东西。

history实际采用了HTML5中提供的API来实现,主要有history.pushState()history.replaceState()

面试官拿起旁边已经凉透的咖啡,喝了一口。

(我难道问不倒这小子了么)

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