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vue-cropper的安装

npm install vue-cropper
或
yarn add vue-cropper

只需要一个图片地址和一个导出截取后图片的方法,vue-cropper在截取图片后会返回一个图片的base64数据。

<template>
  <div class="cropper-content">
    <div class="cropper-box">
      <div class="cropper">
        <vue-cropper
          ref="cropper"
          :img="option.img"
          :outputSize="option.outputSize"
          :outputType="option.outputType"
          :info="option.info"
          :canScale="option.canScale"
          :autoCrop="option.autoCrop"
          :autoCropWidth="option.autoCropWidth"
          :autoCropHeight="option.autoCropHeight"
          :fixed="option.fixed"
          :fixedNumber="option.fixedNumber"
          :full="option.full"
          :fixedBox="option.fixedBox"
          :canMove="option.canMove"
          :canMoveBox="option.canMoveBox"
          :original="option.original"
          :centerBox="option.centerBox"
          :height="option.height"
          :infoTrue="option.infoTrue"
          :maxImgSize="option.maxImgSize"
          :enlarge="option.enlarge"
          :mode="option.mode"
          @realTime="realTime"
          @imgLoad="imgLoad"
        >
        </vue-cropper>
      </div>
      <!--底部操作工具按钮-->
      <div class="footer-btn">
        <div class="scope-btn">
          <label class="btn" for="uploads">选择封面</label>
          <input
            type="file"
            id="uploads"
            style="position: absolute; clip: rect(0 0 0 0)"
            accept="image/png, image/jpeg, image/gif, image/jpg"
            @change="selectImg($event)"
          />
          <el-button
            size="mini"
            type="danger"
            plain
            icon="el-icon-zoom-in"
            @click="changeScale(1)"
            >放大</el-button
          >
          <el-button
            size="mini"
            type="danger"
            plain
            icon="el-icon-zoom-out"
            @click="changeScale(-1)"
            >缩小</el-button
          >
          <el-button size="mini" type="danger" plain @click="rotateLeft"
            >左旋转</el-button
          >
          <el-button size="mini" type="danger" plain @click="rotateRight"
            >右旋转</el-button
          >
        </div>
        <div class="upload-btn">
          <el-button size="mini" type="success" @click="uploadImg('blob')"
            >上传封面 <i class="el-icon-upload"></i
          ></el-button>
        </div>
      </div>
    </div>
    <!--预览效果图-->
    <div class="show-preview">
      <div :style="previews.div" class="preview">
        <img :src="previews.url" :style="previews.img" />
      </div>
    </div>
  </div>
</template>

<script>
import { VueCropper } from 'vue-cropper';
export default {
  name: 'CropperImage',
  components: {
    VueCropper
  },
  props: ['Name'],
  data() {
    return {
      name: this.Name,
      previews: {},
      option: {
        img: '', //裁剪图片的地址
        outputSize: 1, //裁剪生成图片的质量(可选0.1 - 1)
        outputType: 'jpeg', //裁剪生成图片的格式(jpeg || png || webp)
        info: true, //图片大小信息
        canScale: true, //图片是否允许滚轮缩放
        autoCrop: true, //是否默认生成截图框
        autoCropWidth: 230, //默认生成截图框宽度
        autoCropHeight: 150, //默认生成截图框高度
        fixed: true, //是否开启截图框宽高固定比例
        fixedNumber: [1.53, 1], //截图框的宽高比例
        full: false, //false按原比例裁切图片,不失真
        fixedBox: true, //固定截图框大小,不允许改变
        canMove: false, //上传图片是否可以移动
        canMoveBox: true, //截图框能否拖动
        original: false, //上传图片按照原始比例渲染
        centerBox: false, //截图框是否被限制在图片里面
        height: true, //是否按照设备的dpr 输出等比例图片
        infoTrue: false, //true为展示真实输出图片宽高,false展示看到的截图框宽高
        maxImgSize: 3000, //限制图片最大宽度和高度
        enlarge: 1, //图片根据截图框输出比例倍数
        mode: '230px 150px' //图片默认渲染方式
      }
    };
  },
  methods: {
    //初始化函数
    imgLoad(msg) {
      console.log('工具初始化函数=====' + msg);
    },
    //图片缩放
    changeScale(num) {
      num = num || 1;
      this.$refs.cropper.changeScale(num);
    },
    //向左旋转
    rotateLeft() {
      this.$refs.cropper.rotateLeft();
    },
    //向右旋转
    rotateRight() {
      this.$refs.cropper.rotateRight();
    },
    //实时预览函数
    realTime(data) {
      this.previews = data;
    },
    //选择图片
    selectImg(e) {
      let file = e.target.files[0];
      if (!/\.(jpg|jpeg|png|JPG|PNG)$/.test(e.target.value)) {
        this.$message({
          message: '图片类型要求:jpeg、jpg、png',
          type: 'error'
        });
        return false;
      }
      //转化为blob
      let reader = new FileReader();
      reader.onload = (e) => {
        let data;
        if (typeof e.target.result === 'object') {
          data = window.URL.createObjectURL(new Blob([e.target.result]));
        } else {
          data = e.target.result;
        }
        // 赋值选择图片的地址
        this.option.img = data;
      };
      //转化为base64
      reader.readAsDataURL(file);
    },
    //上传图片
    uploadImg(type) {
      let _this = this;
      if (type === 'blob') {
        //获取截图的blob数据
        this.$refs.cropper.getCropBlob(async (data) => {
          let formData = new FormData();
        });
      }
    }
  }
};
</script>

<style scoped lang="scss">
.cropper-content {
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .cropper-box {
    flex: 1;
    width: 100%;
    .cropper {
      width: auto;
      height: 300px;
    }
  }

  .show-preview {
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
    .preview {
      overflow: hidden;
      border: 1px solid #67c23a;
      background: #cccccc;
    }
  }
}
.footer-btn {
  margin-top: 30px;
  display: flex;
  display: -webkit-flex;
  justify-content: flex-end;
  .scope-btn {
    display: flex;
    display: -webkit-flex;
    justify-content: space-between;
    padding-right: 10px;
  }
  .upload-btn {
    flex: 1;
    -webkit-flex: 1;
    display: flex;
    display: -webkit-flex;
    justify-content: center;
  }
  .btn {
    outline: none;
    display: inline-block;
    line-height: 1;
    white-space: nowrap;
    cursor: pointer;
    -webkit-appearance: none;
    text-align: center;
    -webkit-box-sizing: border-box;
    box-sizing: border-box;
    outline: 0;
    -webkit-transition: 0.1s;
    transition: 0.1s;
    font-weight: 500;
    padding: 8px 15px;
    font-size: 12px;
    border-radius: 3px;
    color: #fff;
    background-color: #409eff;
    border-color: #409eff;
    margin-right: 10px;
  }
}
</style>

预览效果图:
image.png

常用api属性描述:

    img: '', //裁剪图片的地址
    outputSize: 1, //裁剪生成图片的质量(可选0.1 - 1)
    outputType: 'jpeg', //裁剪生成图片的格式(jpeg || png || webp)
    info: true, //图片大小信息
    canScale: true, //图片是否允许滚轮缩放
    autoCrop: true, //是否默认生成截图框
    autoCropWidth: 230, //默认生成截图框宽度
    autoCropHeight: 150, //默认生成截图框高度
    fixed: true, //是否开启截图框宽高固定比例
    fixedNumber: [1.53, 1], //截图框的宽高比例
    full: false, //false按原比例裁切图片,不失真
    fixedBox: true, //固定截图框大小,不允许改变
    canMove: false, //上传图片是否可以移动
    canMoveBox: true, //截图框能否拖动
    original: false, //上传图片按照原始比例渲染
    centerBox: false, //截图框是否被限制在图片里面
    height: true, //是否按照设备的dpr 输出等比例图片
    infoTrue: false, //true为展示真实输出图片宽高,false展示看到的截图框宽高
    maxImgSize: 3000, //限制图片最大宽度和高度
    enlarge: 1, //图片根据截图框输出比例倍数
    mode: '230px 150px' //图片默认渲染方式

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