javascript - 开发拾遗 - 技术分享

python unicode字符串转成中文

s = 'u6d4bu8bd5u957fu5ea6' 
s = s.replace('u', '\u') 
print s.decode('unicode-escape')

php 二进制直接量

$bin = bindec('110011');  
$bin = 0b110011;

php foreach list

$arr = [
    [1, 2],
    [3, 4],
];
foreach ($arr as list($a, $b)) {
    echo $a.$b\n";
}

PHP ==和隐式转换

var_dump(md5('240610708') == md5('QNKCDZO'));// true  两个字符串恰好以0e 的科学记数法开头，字符串被隐式转换为浮点数，也就等效于0×10^0
var_dump(sha1('aaroZmOk') == sha1('aaK1STfY'));// true
var_dump('0x1234Ab' == '1193131');// true 0x1234Ab转为16进制，php7无此bug
var_dump( 0 == "a" );// true
var_dump( "0" == "a" );// true

== 、switch、in_array 的松比较

// 如果 $name 值为 0，那么它会满足任何一条 case
switch ($name) {// 使用switch (strval($name)) {
    case "danny":
        break;
    case "eve":
        break;
}
$needle = '1abc'; 
$haystack = array(1,2,3); 
var_dump(in_array($needle, $haystack);// true

javascript Date对象的浏览器兼容性问题

// chrome同时支持'-'和'/'分割日期的时间字符串；safari不支持'-'分割日期的时间字符串

var arr = "2010-03-15 10:30:00".split(/[- / :]/),
    date = new Date(arr[0], arr[1]-1, arr[2], arr[3], arr[4], arr[5]);

javascript 模拟Object.keys()

function keys(obj){
  var a = [];
  for(a[a.length] in obj);
  return a;
}

javascript数组去重

function dedupe(array){
    return Array.from(new Set(array));
}

dedupe([1,1,2,3]) //[1,2,3]

工具

// 命令行提示tldr npm install -g tldr

octotree 是一款可为 GitHub 和 GitLab 添加侧边栏文件导航的 Chrome 和 Opera 插件
python下载视频工具

Sublime Text3 汉化

// Package Control：Install Package，输入Chinese，选择ChineseLocalization

javascript reduce

arr = [1,2,3,4,5] 
arr.reduce(function(a,b){ 
return a*10+b; 
});//12345
var result = [1, 2, 3, 4, 5].reduce(function(prev, curr, index, array){
debugger;
    prev.push(curr * 2);
    return prev;
}, []);
console.log(result);//[2, 4, 6, 8, 10]
//求最大值
var max = arr.reduce(function(pre,cur,inde,arr){return pre>cur?pre:cur;});
var arr = [ {name: 'brick1'}, {name: 'brick2'}, {name: 'brick3'} ]
function carryBricks(arr){
  return arr.reduce(function(prev, current, index, array){
    if (index === 0){
      return current.name;
    }
    else if (index === array.length - 1){
      return prev + ' & ' + current.name;
    }
    else {
      return prev + ', ' + current.name;
    }
  }, '');
 }//brick11, brick12 & brick13
//去重
var arr = [1, 3, 1, 'x', 'zz', 'x', false, false];
var result = arr.reduce(function(prev, curr, i, array) {
    var flag = prev.every(function(value) {
        return value !== curr;
    });
    flag && prev.push(curr);
    return prev;
}, []);
console.log(result);

jquery插件

输入提示自动完成插件tokeninput
tablesorter 表格排序
Date.js执行日期/时间的计算
图片裁剪
 日期选择插件pickadate.js
javascript刻度条插件

0.1+0.2

Math.round( (.1+.2)*100)/100; //0.3

mysql分解联合查询

select * from teacher 
join school on teacher.id = school.id
join course on teacher.id = course.id
where course.name= 'english'  

分解后 
select * from course where name = 'english'
select * from  school where course_id = 1
select * from teacher where school_id in (1,2,3)

字符串中每个字母重复出现的次数

 var temp = {};
   'abcdaabc'.replace(/(\w{1})/g,function($1){
        temp[$1] ? temp[$1]+=1 : temp[$1] = 1;
    })
    console.log(temp) // {a: 3, b: 2, c: 2, d: 1}

composer

PHP HTTP请求套件
 实现 Laravel 模型的无限极分类

php一维数组转多维数组

$arr = ['a', 'b', 'c', 'd'];
$child = array();
$res = [];
while($v = array_pop($arr)) {
    $res = [$v => $child];
    $child = $res;
}

python中字符串的按位或

a = "1000111000"
b = "1000000001"

c = int(a, 2) | int(b, 2)

print('{0:b}'.format(c))#1000111001

python生成斐波拉契数列

def fib(max):
    n, a, b = 0, 0, 1
    while n < max:
        print(b)
        a, b = b, a + b
        n = n + 1
    return 'done'

php正则匹配

$str="{a:1,b:2,c:3}"; 
preg_match_all('/(\w+):(\d+)/', $str, $matches); 
$arr = array_combine($matches[1], $matches[2]);#['a'=>1,'b'=>2,'c'=>3]

php max/min

max(ceil(-0.5), 0) # -0.0
max(0, ceil(-0.5)) # 0

NaN

_.isNaN = function(obj){
    return _.isNumber(obj) && obj !==+obj;
};

Mysql 用一张表中的数据更新另一张表的数据

update tableA as ca inner join tableB as cb set ca.thumbs=cb.thumbs where cb.courseid=1;
24.php后期静态绑定

class A {   
public static function get_self() {     
return new self();   
}      
public static function get_static() {     
return new static();   
} 
}   
 class B extends A {} 
get_class(B::get_self());//A 
get_class(B::get_static()) //B 
get_class(A::get_static());//A

json_encode输出动态javascript

$images = array(  'myself.png' , 'friends.png' , 'colleagues.png' ); 
$js_code = 'var images = ' . json_encode($images);  
echo $js_code; // var images = ["myself.png","friends.png","colleagues.png"]

String.fromCharCode

var regex_num_set = /&#(\d+);/g;
var str = "Here is some text: &#27599;&#26085;&#19968;&#33394;|&#34013;&#30333;~"

str2 = str.replace(regex_num_set, function(_, $1) {
  return String.fromCharCode($1);
});//"Here is some text: 每日一色|蓝白~"

日期格式补0

"2015-5-2".replace(/(?=\b\d\b)/g, '0')#"2015-05-02"
"2015-5-2".replace(/-(\d)(?=-|$)/g, '-0$1')#"2015-05-02"

array_merge如果传的参数中有一个不是数组；则返回null

$arr = [1,2,3];
$new = '';
array_merge($arr, $new);//null
array_merge($arr, (array)$new);

php switch使用的是==比较；而不是===

switch (0) {//switch (strval(0))
    case 'test1':
        echo 1;
    case 'test2':
        echo 2;
    case 'test3':
        echo 3;
        break;
}

javascript数组的map方法对一个数组中的空位置(没有设置过值或值被删除)不会调用提供的callback回调函数

var arr=[1,,3];//第2个位置为空位置
 
var result=arr.map(function(x){
     console.log(x);
     return x + 1;//2,undefined,4
});
arr[1]=undefined;//第2个位置为非空位置，有值undefined
result=arr.map(function(x){
     console.log(x);
     return x + 1;//2,NaN,4
});

setTimeout传入参数

for(var i = 0; i<data.length; i++){
    (function(i){
    setTimeout(function (){
        console.log(data[i])
    },2000);
    })(i)
}
//es6
for(let i = 0; i<data.length; i++){
    setTimeout(function (){
        console.log(data[i])
    },2000);
}

循环中promise

var userIds = ['aaa', 'bbb', 'ccc'];

//这里getUserById返回的是Promise
var promises = arr.map(userIds => getUserById(userId));

Promise
    .all(promises)
    .then(function(users) {
        console.log(users); //这里就是users的列表了
    });

hasClass

function hasClass(element, cName) {
  return (' ' + element.className + ' ').indexOf(' ' + cName + ' ') > -1;
}

补零

"2016-1-9 12：12:20".replace(/-(\d)(?=-|\s)/g, '-0$1')
var str = '2016-1-9 12:12:20';
var ss = str.replace(/-([0-9]+)/g, function(match, p) {
    return p.length !== 1 ? match : '-0' + p;
});

getUrlParameter

var getUrlParameter = function getUrlParameter(sParam) {
    var sPageURL = decodeURIComponent(window.location.search.substring(1)),
        sURLVariables = sPageURL.split('&'),
        sParameterName,
        i;

    for (i = 0; i < sURLVariables.length; i++) {
        sParameterName = sURLVariables[i].split('=');

        if (sParameterName[0] === sParam) {
            return sParameterName[1] === undefined ? true : sParameterName[1];
        }
    }
};

随机数

Math.round(Math.random() * 1000)//生成0~1000之间的随机整数
((Math.random() * 10 + 5).toFixed(1) - 0)//产生一个5到15之间，包含一位小数的随机数Math.floor((Math.random() * 10 + 5) * 10) / 10

显示隐藏元素

window.onload=function(){  
    var li=document.getElementsByTagName("li");    
      for(var j=0;j<li.length;j++){ 
       li[j].onclick=function (){        
        for(var i=0;i<li.length;i++){     
           li[i].className='';       
        }         
        this.className='a';       
      }
   }
};

判断一个json对象中是否含有某个key

function find (obj, key) {
    if (! typeof obj === 'object') return false;
    if (key in obj) return true;
    for (var k in obj) if find(obj[k], key) return true;
    return false;
}

数组合并

array = [[1,2,3],[4,5,6],[7,8,9]];
array=array.reduce(function(a,b){return a.concat(b)})//[1,2,3,4,5,6,7,8,9]
array.concat.apply([], array);

区间索引

function getRangeIndex(scrollTop) {
    var i=0;
    ranges = [2,3,6,22,88];
    for (;i<ranges.length;i++) 
        if (scrollTop<ranges[i]) break;
    return i-1;
}

快速生成一个数组，数组的元素是前N个自然数

let f = length => Array.from({length}).map((v,k) => k);
let f = length => [...Array.from({length}).keys()]
let fn = len => Object.keys(new Array(len + 1).join(','))

每取10行放到一个新的文件中

with open('file.txt') as reader, open('newfile.txt', 'w') as writer:
    for index, line in enumerate(reader):
        if index % 10 == 0:
            writer.write(line)

按首字母排序

var arr = [9,8,7,6,5,1,'在', '我', '里', '阿','z','a','h','m'];
arr.sort(function(a,b){return a.toString().localeCompare(b)}) //[1, 5, 6, 7, 8, 9, "阿", "里", "我", "在", "a", "h", "m", "z"]

删除字符串的空格

$str='                            Controllable Eu valence for photoluminescence tuning in apatite-typed';
//pC:所有的unicode“other” pZ:所有的unicode“separator” ,所有空格和不可见字符
echo $str = preg_replace('/^[\pZ\pC]+|[\pZ\pC]+$/u','',$str);//Controllable Eu valence for photoluminescence tuning in apatite-typed

PHP解析JSON得到科学计数法后的int

$json = '{"number": 12345678901234567890}';
var_dump(json_decode($json,1));//[ "number" => 1.2345678901235e+19]
var_dump(json_decode($json,1, 512, JSON_BIGINT_AS_STRING));//["number" => "12345678901234567890"]
//http://cn2.php.net/manual/zh/function.json-decode.php

MySQL中所有数据库的数据大小

SELECT table_schema, (
(
SUM( DATA_LENGTH ) + SUM( INDEX_LENGTH )
) /1024 /1024
) AS datasize
FROM  `TABLES`
GROUP BY table_schema
LIMIT 0 , 30

合并数组

//一般会用Array.prototype.concat()函数，但不适合来合并两个大型数组，会消耗大量内存来存储新创建的数组。可用Array.prototype.push来替代创建一个新数组，可减少内存的使用。
var array1 = [1,2,3];
var array2 = [4,5,6];
console.log(array1.push.apply(array1, array2)); // [1,2,3,4,5,6];
console.log(array1.push.call(array1, array2)); // [1,2,3,[4,5,6]];

php上传文件

$tmp_name='test.jpg';
    if(version_compare(phpversion(),'5.5.0') >= 0 && class_exists('CURLFile')){
        $fields['file'] = new CURLFile(realpath($tmp_name));
    }else{
        $fields['file'] = '@'.$tmp_name;//加@符号curl就会把它当成是文件上传处理
    }

php stdclass

$tanteng = new stdClass();
$tanteng->name = 'tanteng';
$tanteng->email = 'xxx@qq.com';
 //把定义的对象『转换』成数组
$info = get_object_vars($tanteng);
$user = new stdClass();
$user->name = 'gouki';
$user->hehe = 'hehe';
$myUser = $user;
$myUser->name = 'flypig';
 //$myUser的属性确实改变了$user声明的stdClass属性。而如果$user是一个数组，赋值给$myUser，那就拷贝了一个副本给$myUser，这样增大系统开销
print_r($user);
 
print_r($myUser);
 
print_r($user);

PHP浮点数运算精度

$a = 69.1;
 
$b = $a*100;
 
$c = $b-6910;//-9.0949470177293E-13

$c = round($b)-6910;
$x = 8 - 6.4;  // which is equal to 1.6
$y = 1.6;
var_dump($x == $y); // is not true
var_dump(round($x, 2) == round($y, 2)); // this is true
$a = intval( 0.58*100 );//57
 
$b = 0.58*100;
$a = intval( (0.58*1000)/10 );//58
intval( round(0.58*100 ));//58

防止浏览器屏蔽window.open

<button onclick=“test()”>点击</button>
<script>
    function test(){
        var frame=window.open(“about:blank”,“_blank”);
        $.get(“/”,function(){
            frame.location=“http://www.baidu.com”;
        });
    }
</script>

修改session_id的保存位置

session_set_cookie_params(0,‘/’,‘testdomain’);
session_start();//开启session
echo ‘Old Session id:’.session_id().‘<br>’;
session_regenerate_id(true);//重置session_id，并使原session无效
echo ‘New Session id:’.session_id().‘<br>’;
//echo session_id()失效
setcookie(session_name(),session_id(),0,‘/’,‘testdomain’);//手动更新session_id

CRUL命令简单分析请求细节所占用的时间

curl -o /dev/null -s -w %{http_code}:%{time_namelookup}:%{time_redirect}:%{time_pretransfer}:%{time_connect}:%{time_starttransfer}:%{time_total}:%{speed_download} www.baidu.com
//这个例子是分析一次百度的请求各个参数：http状态码、DNS解析时间、重定向时间、从开始到准备传输的时间、TCP连接时间、开始传输时间、总时间、下载速度CURL文档：https://curl.haxx.se/docs/manpage.html

php上周时间

echo '<br>上周起始时间:<br>';
echo date("Y-m-d H:i:s",mktime(0, 0 , 0,date("m"),date("d")-date("w")+1-7,date("Y"))),"\n";
echo date("Y-m-d H:i:s",mktime(23,59,59,date("m"),date("d")-date("w")+7-7,date("Y"))),"\n";

echo date("Y-m-d",strtotime('-1 week last monday'))." 00:00:00";
echo date("Y-m-d",strtotime('last sunday'))." 23:59:59";
//当前时间的上一周时间  每周时间固定为7天
date('Y-m-d', strtotime('-1 week'))
//如果当前日期为2016-5-31, 用date('Y-m-d', strtotime('-1 month'))会产生错误。因为这里把 -1 month按照-30 days来算
date('Y-m-d', strtotime('2016-05-31 -1 month')) = 2016-05-01
date('Y-m-d', strtotime('2016-01-31 +1 month')) = 2016-03-02
//如果需要取当前月的前后月份的话，需要小心，正确做法可以改为
date('m', strtotime(date('Y-m-1').' -1 month'))
date('m', strtotime(date('Y-m-1').' +1 month'))

{ "a":"1","b":"2"} 变成 "a:1;b:2"

var obj = {"a":"1","b":"2","c":"3"};
var str = $.map(obj,function(n,index){return ''+index+':'+n;}).join(';');//"a:1;b:2;c:3"
var str = JSON.stringify(obj).replace(/"|{|}/g, "").replace(/,/g, ";")
Object.keys({"a":"1","b":"2"}).map(function(key){return key+':'+info[key]}).join(';');

python格式化

ips = (
    (1, '10.121.1.1:4730'),
    (2, '127.0.0.1:4730'),
    (3, '127.0.0.1:4730')
)

dic = {}
for v, k in ips:
    dic.setdefault(k, []).append((v, k))

print dic
{
    '10.121.1.1:4730':
        [(1, '10.121.1.1:4730')], 
    '127.0.0.1:4730':
        [(2, '127.0.0.1:4730'), (3, '127.0.0.1:4730')]
}

PHP生成连续数据

$numbers = array(0, 1, 3, 5, 6, 8, 10);
sort($numbers);
$new = range(array_shift($numbers),end($numbers));//[0 1 2 3 4 5 6 7 8 9 10]
$a = [0,1,3,5,6,8,10];//原始数据
sort($a);
range(array_shift($a),array_pop($a));

javascript对象复制

function clone(e) {
    var t = {};
    for (var n in e) e.hasOwnProperty(n) && (t[n] = e[n]);
    return t;
}

过滤掉emoji表情

function filterEmoji($str)
{
    $str = preg_replace_callback(
            '/./u',
            function (array $match) {
                return strlen($match[0]) >= 4 ? '' : $match[0];
            },
            $str);

     return $str;
 }

javascript选择器

function $(selector, context) {
        context = context || document;
        var elements = context.querySelectorAll(selector);
        return Array.prototype.slice.call(elements);
    };

jquery对象对比,开发中要尽量先保存创建的jQuery对象，然后多次使用

var elem1 = $("#navList li");
var elem2 = $("#navList li");
elem1 ==elem2;//false
//应该比较dom本身不是 jQuery对象
$('div') === $('div') //false
$('div')[0] === $('div')[0]//true

for 循环和异步调用的问题

for (var i = 0; i < 6; i++) {
    // do 同步执行，里面的 i 是 0 
    do(i).then(function() {
       // another 异步执行，此时 i 已经是循环后的6
        another(i)
    })
}
//使用闭包保存变量的方式来解决
for (var i = 0; i < 6; i++) {
    // 立即执行函数作闭包，保存变量i为index
    (function(index) {
        do(index).then(function() {
            another(index);
        })
    })(i)
}

按照字母和数字的顺序进行排序

var arr = ['A1','A2','A100','A7','B2','A10','A14','B12','C1','C10','C5']
arr.sort(function(a, b) {
  var ret = a.charCodeAt(0) - b.charCodeAt(0); // 首字母处理
  if (ret == 0) {
    ret = +a.slice(1) - +b.slice(1); // 数字处理
  }
  return ret;//["A1", "A2", "A7", "A10", "A14", "A100", "B2", "B12", "C1", "C5", "C10"]
});

JSON.parse转换报错

var getValue = function (objStr) {
    return new Function("return " + objStr)()
}
// 调用
var res1 = getValue('{"foo" : 1, }')//Object {foo: 1}
JSON.parse(res1);

javascript正则替换

var str = 'abc{xdf}efg{dfg}ijk{232}';
var arr = ['d', 'h', 'l'];
var result = str.match(/\{.*?\}/g);
for (var i = 0; i < result.length; i++) {
    str = str.replace(result[i], arr[i])
}
console.log(str);
//abcdefghijkl

javascript闭包

function Score(){
    this.scores = [];
}
Score.prototype.add = function(score){
    this.scores.push(score);
};
Score.prototype.showAverage = function(){
    let sum = this.scores.reduce(function(pre,cur){
        return pre+cur;
    });
    console.log(sum*1.0/this.scores.length);
};
let scores = [90,80,70];
let score1 = new Score();
scores.forEach(score1.add);//scores.forEach(score1.add.bind(score1));
scores.forEach(function(score) {
    score1.add(score);
});
score1.showAverage();

javascript array reduce()

arr.reduce(function (pre, cur, index) {
    if (index >= 3) {
        return pre;
    }
    return pre + cur;
}, initVal);

javascript 汉字占2字节

function getLength(str) {
    return str.replace(/[^ -~]/g, 'AA').length;
}

function limitMaxLength(str, maxLength) {
    var result = [];
    for (var i = 0; i < maxLength; i++) {
        var char = str[i]
        if (/[^ -~]/.test(char))
            maxLength--;
        result.push(char);
    }
    return result.join('');
}

隐藏手机号

echo substr_replace ('13412343312','****',3,4) ;//134**3312

javascript数组降维

var flatten = function(array) {
    return array.reduce(function(previous, i) {
        if (Object.prototype.toString.call(i) !== '[object Array]') {
            return (previous.push(i), previous);
        }
        return (Array.prototype.push.apply(previous, flatten(i)), previous);
    }, []);
};
undefined
flatten([[1, 2],[3, 4, 5], [6, 7, 8, 9,[11,12,[12,13,[14]]]],10]);
//[1, 2, 3, 4, 5, 6, 7, 8, 9, 11, 12, 12, 13, 14, 10]
[[0, 1], [2, 3], [4, 5]].reduce(function(a, b) {
    return a.concat(b);
});

获取content-type

//获取content-type
function getContentType($url)
{
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_HEADER, 1);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
    curl_setopt($ch, CURLOPT_NOBODY, 1);
    curl_exec($ch);
    $contentType = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
    return $contentType;
}
 
//获取url后缀
function getUrlExtension($url)
{
    $parseurl = parse_url($url);
    $extension = pathinfo($parseurl['path'], PATHINFO_EXTENSION);
    return $extension;
}

PHP随机合并数组并保持原排序

//随机合并两个数组元素，保持原有数据的排序不变（即各个数组的元素在合并后的数组中排序与自身原来一致）
function shuffleMergeArray() {
    $mergeArray = array();
    $sum = count($array1) + count($array2);
    for ($k = $sum; $k > 0; $k--) {
        $number = mt_rand(1, 2);
        if ($number == 1) {
            $mergeArray[] = $array2 ? array_shift($array2) : array_shift($array1);
        } else {
            $mergeArray[] = $array1 ? array_shift($array1) : array_shift($array2);
        }
    }


    return $mergeArray;
//合并前的数组：
$array1 = array(1, 2, 3, 4);
$array2 = array('a', 'b', 'c', 'd', 'e');

//合并后的数据：
$mergeArray = array (
  0 => 'a',
  1 => 1,
  2 => 'b',
  3 => 2,
  4 => 'c',
  5 => 'd',
  6 => 3,
  7 => 4,
  8 => 'e',
)

仿知乎复制文本自带版权声明

document.body.addEventListener('copy', function (e) {
    if (window.getSelection().toString() && window.getSelection().toString().length > 42) {
        setClipboardText(e);
        alert('商业转载请联系作者获得授权，非商业转载请注明出处，谢谢合作。');
    }
});
 
function setClipboardText(event) {
    var clipboardData = event.clipboardData || window.clipboardData;
    if (clipboardData) {
        event.preventDefault();
 
        var htmlData = ''
            + '著作权归作者所有。<br>'
            + '商业转载请联系作者获得授权，非商业转载请注明出处。<br>'
            + '作者：DIYgod<br>'
            + '链接：' + window.location.href + '<br>'
            + '来源：Anotherhome<br><br>'
            + window.getSelection().toString();
        var textData = ''
            + '著作权归作者所有。\n'
            + '商业转载请联系作者获得授权，非商业转载请注明出处。\n'
            + '作者：DIYgod\n'
            + '链接：' + window.location.href + '\n'
            + '来源：Anotherhome\n\n'
            + window.getSelection().toString();
 
        clipboardData.setData('text/html', htmlData);
        clipboardData.setData('text/plain',textData);
    }
}

根据用户积分判断等级

//lv1:1~50
//lv2:51~110
//lv3:111~180
//lv4:181~260
function getLevel($point) {
    $level = 0;
    while($point >= 0) {
        $point -= 50 + $level++ * 10;
    }
    return $level;
}

0000000序列递增

for ($i = 0; $i < 100; $i++) { 
    $zero = '';
    $k = 7-strlen($i);
    for ($j = $k; $j >0; $j--) { 
        $zero .= 0;
    }
    echo $zero.$i.'<br>';
}
for (var i = 0 ; i <= 100; i ++){
  var zero = "";
  for (var j = 7-i.toString().length; j > 0; j--) {
    zero += "0";
  }
  console.log(zero + i);
}
for ($i=0;$i<=9999999;$i++) echo str_pad($i,7,"0",STR_PAD_LEFT);
//Array.from(Array(1000000).keys()).map(function(x){ return "0".repeat(8 - ("" + (x + 1)).length) + (x+1)})

判断远程图片是否存在

function exist_file($url){ 
$opts=array( 
'http'=>array( 
'method'=>'HEAD', 
'timeout'=>2 
)); 
@file_get_contents($url,false,stream_context_create($opts)); 
if ($http_response_header[0] == 'HTTP/1.1 200 OK') { 
return true; 
} else { 
return false; 
} 
}

检测函数类型


function getType(value){  //基本上可以返回所有的类型，不论你是自定义还是原生
    return Object.prototype.toString.call(value).match(/\s{1}(\w+)/)[1];
}
let obj = new Object();
console.log(getType(obj)); //"Object"

moment.js时间处理

var a = moment([2016, 0, 15]);
var b = moment([2016, 7, 31]);
var diff = b.diff(a, 'months');

var diffMonths = Array
        .apply([], new Array(diff + 1))
        .map(function(item, index) {
            return a.clone().add(index, 'month').format('YYYY-MM');
        });

console.log(diffMonths);//["2016-01", "2016-02", "2016-03", "2016-04", "2016-05", "2016-06", "2016-07"]

php中文正则匹配

php中文正则匹配$str = "one中国你好two";
$preg = "/\P{Han}+/u";
$result = preg_replace($preg, '', $str);
var_dump($result); //string(12) "中国你好" p小写是匹配汉字，P大写是匹配非汉字

生成6位的数字验证码

console.log(('000000' + Math.floor(Math.random() * 999999)).slice(-6));
console.log(Math.random().toString().slice(-6));
console.log(/\d{6}/.exec(Math.random())[0])
console.log('' + Math.floor(Math.random() * 999999));

16进制颜色代码生成


(function(){
return '#'+('00000'+(Math.random()*0x1000000<<0).toString(16)).slice(-6);
})()

php 模拟 tail -f

$handle = popen("tail -f /var/log/nginx/access.log 2>&1", 'r');
     while(!feof($handle)) {
     $buffer = fgets($handle);
     echo "$buffer\n";
     flush();
}
pclose($handle);

mysql distinct

test表的结构
id test1 test2
1 a 1
2 a 2
3 a 3
4 a 1
5 b 1
6 b 2
7 b 3
8 b 2
select distinct test1 from test
test1
a
b
select distinct test1, id from test
test1 id
a 1
a 2
a 3
a 4
b 5
b 6
b 7
b 8
SELECT id, group_concat( DISTINCT test1 ) t FROM test GROUP BY test1
id t
1 a
5 b

php下载文件

try {
    $client = new \GuzzleHttp\Client($url,[
    'curl.options' => [
        CURLOPT_SSL_VERIFYPEER=>2,
        CURLOPT_SSL_VERIFYHOST=true,
    ]
]);
    $data = $client->request('get','http://xxxx')->getBody()->getContents();
    Storage::disk('local')->put('filename', $data);
} catch (\GuzzleHttp\RequestException $e) {
    echo 'fetch fail';
}

javascript sort 排序

var  arr=[3,4,6,21,2,3,4,1,2,9,6,3,4,5,6,7,2,3];
arr.sort(function(a,b){
        return  a>b;
});
console.log(arr);//[9, 3, 2, 3, 2, 3, 2, 1, 3, 4, 4, 4, 5, 6, 6, 6, 7, 21]

var  arr=[3,4,6,21,2,3,4,1,2,9,6,3,4,5,6,7,2,3];
arr.sort(function(a,b){
        return  a-b;
});
console.log(arr);//[1, 2, 2, 2, 3, 3, 3, 3, 4, 4, 4, 5, 6, 6, 6, 7, 9, 21]
var  arr=[
        {name:"one",age:10},
        {name:"two",age:40},
        {name:"three",age:30},
        {name:"four",age:90},
        {name:"five",age:60}
];
arr.sort(function(a,b)  {
        return  a.age-b.age;
});
console.log(arr);

javascript date

new Date(2016,1,31) > new Date(2016, 2, 1)//true
//month 从 0 开始算 new Date(2016,1,31) == 2016 年 2 月 31 日 然而 2 月只有 29 天 so 
new Date(2016,1,31) == 2016 年 3 月 2 日
new Date(2016,1,30) > new Date(2016, 2, 1)//false

javascript lastIndex

function filtrate() { 
var newArr = [], reg = /^\s*$/g, 
str = "baidu,google, , ,baidu,google,bg"; 
arr = str.split(','); 
for (var i = 0; i < arr.length; i++) { 
//var reg = /^\s*$/g; 
if (!reg.test(arr[i])) { 
newArr.push(arr[i]); 
} 
} 
return newArr;//["baidu", "google", " ", "baidu", "google", "bg"] 
} 

function filtrate2() { 
var newArr = [], reg = /^\s*$/g, 
str = "baidu,google, , ,baidu,google,bg"; 
arr = str.split(','); 
for (var i = 0; i < arr.length; i++) { 
var reg = /^\s*$/g; 
if (!reg.test(arr[i])) { 
newArr.push(arr[i]); 
} 
} 
return newArr; //["baidu", "google", "baidu", "google", "bg"]
}

微信浏览器禁止页面下拉查看网址

var overscroll = function(el) {
  el.addEventListener('touchstart', function() {
    var top = el.scrollTop
      , totalScroll = el.scrollHeight
      , currentScroll = top + el.offsetHeight;
    //If we're at the top or the bottom of the containers
    //scroll, push up or down one pixel.
    //
    //this prevents the scroll from "passing through" to
    //the body.
    if(top === 0) {
      el.scrollTop = 1;
    } else if(currentScroll === totalScroll) {
      el.scrollTop = top - 1;
    }
  });
  el.addEventListener('touchmove', function(evt) {
    //if the content is actually scrollable, i.e. the content is long enough
    //that scrolling can occur
    if(el.offsetHeight < el.scrollHeight)
      evt._isScroller = true;
  });
}
overscroll(document.querySelector('.scroll'));
document.body.addEventListener('touchmove', function(evt) {
  //In this case, the default behavior is scrolling the body, which
  //would result in an overflow.  Since we don't want that, we preventDefault.
  if(!evt._isScroller) {
    evt.preventDefault();
  }
});

laravel 为 VerifyCsrfToken 添加过滤条件

//修改 app/Http/Middleware/VerifyCsrfToken.php
<?php

namespace App\Http\Middleware;

use Illuminate\Foundation\Http\Middleware\VerifyCsrfToken as BaseVerifier;
use Closure;

class VerifyCsrfToken extends BaseVerifier
{
    /**
     * The URIs that should be excluded from CSRF verification.
     *
     * @var array
     */
    protected $except = [
        //
    ];

    public function handle($request, Closure $next)
    {
        // 如果是来自 api 域名，就跳过检查
        if ($_SERVER['SERVER_NAME'] != config('api.domain'))
        {
            return parent::handle($request, $next);
        }

        return $next($request);
    }
}

switch 字符串和数字会隐式转换比较


$string="2string";

switch($string)
{
    case (string) 1:
        echo "this is 1";
        break;
    case (string) 2:
        echo "this is 2";
        break;
    case '2string':
        echo "this is a string";
        break;
}

输出调试信息


function log(msg){
    var $body = document.querySelector('body');
    
    if( !$body.querySelector('.info_wz_852') ){
        $body.innerHTML += '<div class="info_wz_852" style="position:fixed;top:0;left:0;z-index:99999; background:#000;color:#f00;"></div>';
    }
        
    var $info = $body.querySelector('.info_wz_852');
    var date = new Date(),
        minute = ('00'+date.getMinutes()).slice(-2),
        second = ('00'+date.getSeconds()).slice(-2);
    
    try{
        throw new Error();
    }catch(e){
        var loc = (e.stack.replace(/Error\n/).split(/\n/)[1]).replace(/^(\s|\u00A0)+/,'').replace(/(\s|\u00A0)+$/,'');
            
        // var arr = loc.split(':'),
        //     col = parseInt(arr.pop()),
        //     line = parseInt(arr.pop());
    
        $info.innerHTML += '<p>['+minute+':'+second+'] '+loc+'</p><p>'+msg+'</p><br/>';
    }
}

对象数组互转方法

/**
     * 数组转换对象
     *
     * @param $arr 数组
     * @return object|void
     */
    public function arrayToObject($arr)
    {

        if (gettype($arr) != 'array') return;
        foreach ($arr as $k => $v) {
            if (gettype($v) == 'array' || getType($v) == 'object')
                $e[$k] = (object)$this->arrayToObject($v);
        }
        return (object)$e;
    }

    /**
     * 对象转换数组
     *
     * @param $e StdClass对象实例
     * @return array|void
     */
    public function objectToArray($s)
    {
        $s = (array)$s;
        foreach ($s as $k => $v) {
            if (gettype($v) == 'resource') return;
            if (gettype($v) == 'object' || gettype($v) == 'array')
                $e[$k] = (array)$this->objectToArray($v);
        }
        return $e;
    }

javascript数组随机

Array.prototype.shuffle = function(n) {
  var len = this.length , num = n?Math.min(n,len):len,arr = this.slice(0)
  arr.sort(function(a,b){
     return Math.random()-0.5
  })
  return arr.slice(0,num-1)
}

php生成不重复字符串

echo sprintf('%x',crc32(microtime()));

PHP 随机用户名账号

//循环创建1万个随机账号，0碰撞，10万大约0-3个碰撞，足够应付未来数十亿级PV
function genUserNumber()
{
    $chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    $username = "";
    for ( $i = 0; $i < 6; $i++ )
    {
        $username .= $chars[mt_rand(0, strlen($chars))];
    }
    return strtoupper(base_convert(time() - 1420070400, 10, 36)).$username;
}

一个操作中对 Redis 服务器执行多个命令

Redis::pipeline(function ($pipe) {
  for ($i = 0; $i < 1000; $i++) {
    $pipe->set("key:$i", $i);
  } 
});

中文拼音排序

from pypinyin import lazy_pinyin

chars = ['鑫','鹭','榕','柘','珈','骅','孚','迦','瀚','濮','浔','沱','泸','恺','怡','岷','萃','兖']

chars.sort(key=lambda char: lazy_pinyin(char)[0][0])

print([lazy_pinyin(char) for char in chars])
print(chars)
[['cui'], ['fu'], ['hua'], ['han'], ['jia'], ['jia'], ['kai'], ['lu'], ['lu'], ['min'], ['pu'], ['rong'], ['tuo'], ['xin'], ['xun'], ['yi'], ['yan'], ['zhe']]
['萃', '孚', '骅', '瀚', '珈', '迦', '恺', '鹭', '泸', '岷', '濮', '榕', '沱', '鑫', '浔', '怡', '兖', '柘']

php 金额每三位加逗号分隔

//money_format
>>> strrev(implode(',', str_split(strrev('434353222323443'), 3)) )
=> "434,353,222,323,443"

php时间格式化


function getDiffTime($timestamp) 
{
    $datetime = new DateTime(date('Y-m-d H:i:s', $timestamp));
    $datetime_now = new DateTime();
    $interval = $datetime_now->diff($datetime);
    list($y, $m, $d, $h, $i, $s) = explode('-', $interval->format('%y-%m-%d-%h-%i-%s'));
    if ((($result = $y) && ($suffix = '年前')) ||
        (($result = $m) && ($suffix = '月前')) ||
        (($result = $d) && ($suffix = '天前')) ||
        (($result = $h) && ($suffix = '小时前')) ||
        (($result = $i) && ($suffix = '分钟前')) ||
        (($result = $s) && ($suffix = '刚刚'))) {
        return $suffix != '刚刚' ? $result . $suffix : $suffix;
    }
}

html写入word

function word($data,$fileName=''){ 
if(empty($data)) return ''; 
$data='<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns="http://www.w3.org/TR/REC-html40">'.$data.'</html>'; 
if(empty($fileName)) $fileName=date('YmdHis').'.doc'; 
$fp=fopen($fileName,'wb'); 
fwrite($fp,$data); 
fclose($fp); 
} 
$str = '<h2>hello daye</h2>'; 
word($str);

一行代码可以看到所有页面元素

[].forEach.call($$("*"),function(a){a.style.outline="1px solid #"+(~~(Math.random()*(1<<24))).toString(16)})
https://segmentfault.com/a/11...
http://blog.tanteng.me/2015/1...
http://joebon.cc/date-cross-b...
https://segmentfault.com/a/11...
https://segmentfault.com/q/10...
https://www.zhihu.com/questio...
http://t.cn/RqgIMWa
http://t.cn/h4tDfg
http://div.io/topic/1610
https://www.talkingcoder.com/...
http://www.w3cfuns.com/notes/...
http://www.cnblogs.com/shocke...

开发拾遗