vue项目使用cropperjs制作图片剪裁，压缩组件

项目中裁剪图片效果

代码部分：（将上传部分 封装成一个组件直接调用当前组件） 

<template>
  <div id="demo">
    <!-- 遮罩层 -->
    <div class="father" v-show="panel">
    <div class="container">
      <div id="cropper" style="margin-top:1%;margin-left: 1%;margin-right: 1%;height: 85%;margin-bottom: 1%">
        <img id="image" :src="url" alt="Picture">
      </div>
      <div>
        <div style="float: right;margin-right: 1%">
          <el-button icon="el-icon-zoom-out" @click="zoom(-1)" size="mini" circle></el-button>
          <el-button icon="el-icon-zoom-in" @click="zoom(1)" size="mini" circle></el-button>
          <el-button icon="el-icon-refresh" @click="rotate" size="mini" circle></el-button>
          <el-button type="success" icon="el-icon-check" @click="crop" size="mini" circle></el-button>
          <el-button type="danger" icon="el-icon-close" @click="panel=false" size="mini" circle></el-button>
        </div>
      </div>
    </div>
  </div>
    <div >
      <div >
        <input type="file" id="change" accept="image" @change="change" style="display:none;">
        <div  class="show"
              v-on:mouseover="addClassload"
              v-on:mouseout="removeClassload"
              @click="upload"
              :style="'backgroundImage:url(http://d.fumaqi.com'+params.logo+');border: 1px dashed '+color">
          <i class="el-icon-plus i" :style="'color: '+color"></i>
        </div>
      </div>
    </div>
  </div>
 
</template>
 
 
<script>
  // import {test} from '@/api/psych'
  import { uploadImg } from '@/api/index'
  import Cropper from 'cropperjs'
  export default {
    components: {
 
    },
    props:["params"],
    data () {
      return {
        headerImage: '',
        picValue:'',
        cropper:'',
        croppable:false,
        panel:false,
        url:'',
        color:"#d9d9d9",
        current:0,
 
      }
    },
    mounted () {
      //初始化这个裁剪框
      var self = this;
      var image = document.getElementById('image');
      this.cropper = new Cropper(image, {
        aspectRatio: 1,
        viewMode: 1,
        zoomOnWheel:false,//是否允许通过鼠标滚轮来缩放图片
        background:true,//是否在容器上显示网格背景
        rotatable:true,//是否允许旋转图片
        ready: function () {
          self.croppable = true;
        }
      });
      console.log(133)
      console.log(this.params.logo)
      this.headerImage = this.params.logo
    },
    methods: {
      addClassload(){
        this. color="#1b95e0"
      },
      removeClassload(){
        this. color="#d9d9d9"
      },
      //点击按钮自动执行选择文件事件
      upload(){
        this.url='',
        this.current=0;
        document.getElementById("change").value=null;
        document.getElementById("change").click();
      },
      //旋转
      rotate(){
        //alert(this.cropper.image)
        this.current = (this.current+90)%360;
        this.cropper.rotate(this.current);
      },
      //缩放
      zoom(num){
        num = num || 1;
        this.cropper.zoom(num);
      },
 
      getObjectURL (file) {
        var url = null ;
        if (window.createObjectURL!=undefined) { // basic
          url = window.createObjectURL(file) ;
        } else if (window.URL!=undefined) { // mozilla(firefox)
          url = window.URL.createObjectURL(file) ;
        } else if (window.webkitURL!=undefined) { // webkit or chrome
          url = window.webkitURL.createObjectURL(file) ;
        }
        return url ;
      },
      change (e) {
        let files = e.target.files || e.dataTransfer.files;
        if (!files.length) return;
        this.panel = true;
        this.picValue = files[0];
        this.url = this.getObjectURL(this.picValue);
        //每次替换图片要重新得到新的url
        if(this.cropper){
          this.cropper.replace(this.url);
        }
        this.panel = true;
      },
      crop () {
        this.panel = false;
        var croppedCanvas;
        var roundedCanvas;
 
        if (!this.croppable) {
          return;
        }
        // Crop
        croppedCanvas = this.cropper.getCroppedCanvas();
        console.log(this.cropper)
        // Round
        /*截取圆形
        roundedCanvas = this.getRoundedCanvas(croppedCanvas);
        this.headerImage = roundedCanvas.toDataURL();
        */
        //方形
        this.headerImage = croppedCanvas.toDataURL();
 
        var   gettype=Object.prototype.toString
        this.postImg()
 
      },
      dataURLtoFile (dataurl, filename = 'file') {
        let arr = dataurl.split(',')
        let mime = arr[0].match(/:(.*?);/)[1]
        let suffix = mime.split('/')[1]
        let bstr = atob(arr[1])
        let n = bstr.length
        let u8arr = new Uint8Array(n)
        while (n--) {
          u8arr[n] = bstr.charCodeAt(n)
        }
        return new File([u8arr], `${filename}.${suffix}`, {type: mime})
      },
     /* // 截取圆形
      getRoundedCanvas (sourceCanvas) {
        var canvas = document.createElement('canvas');
        var context = canvas.getContext('2d');
        var width = sourceCanvas.width;
        var height = sourceCanvas.height;
        canvas.width = width;
        canvas.height = height;
        context.imageSmoothingEnabled = true;
        context.drawImage(sourceCanvas, 0, 0, width, height);
        context.globalCompositeOperation = 'destination-in';
        context.beginPath();
        context.arc(width / 2, height / 2, Math.min(width, height) / 2, 0, 2 * Math.PI, true);
        context.fill();
        return canvas;
      },*/
      postImg () {
        //这边写图片的上传
        var formData = new FormData();
        formData.append("avatar",this.dataURLtoFile(this.headerImage));
        uploadImg(formData).then(response => {
          if(response.data.code == 0){
              //  alert("成功");
              this.params.logo = response.data.data
               this.$emit('changeImg',response.data.data)
          }else{
              this.$toast(res.data.msg)
            }
 
        }).catch((res) => {
              this.$toast('网路异常')
          })
 
      }
    }
  }
 
</script>
 
<style>
  *{
    margin: 0;
    padding: 0;
  }
  .father{
    background-color: rgba(0,0,0,0.5);
    position: fixed;
    left:0px;
    top:0px;
    100%;
    height:100%;
    z-index: 33;
  }
  .i{
    font-size: 28px;
    color: #8c939d;
     100px;
    height: 100px;
    line-height: 100px;
    text-align: center;
  }
  #demo .show {
    border: 1px dashed #d9d9d9;
    border-radius: 10%;
     100px;
    height: 100px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
    display: inline-block;
    text-align: center;
    outline: none;
    background-position: center center;
    background-repeat: no-repeat;
    background-size: cover;
  }
  #demo .container {
    z-index: 99;
    height: 300px;
     100%;
 
    position: fixed;
    /*padding-top: 60px;*/
    /* left: 35%; */
    top: 25%;
 
    background-color: white;
  }
  #demo #image {
    max- 100%;
 
  }
 /* .cropper-view-box,.cropper-face {
    border-radius: 100%; 圆形截图设置
  }*/
  /*!
   * Cropper.js v1.0.0-rc
   * https://github.com/fengyuanchen/cropperjs
   *
   * Copyright (c) 2017 Fengyuan Chen
   * Released under the MIT license
   *
   * Date: 2017-03-25T12:02:21.062Z
   */
  .cropper-container {
    font-size: 0;
    line-height: 0;
    position: relative;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    direction: ltr;
    -ms-touch-action: none;
    touch-action: none
  }
 
  .cropper-container img {
    /* Avoid margin top issue (Occur only when margin-top <= -height) */
    display: block;
    min- 0 !important;
    max- none !important;
    min-height: 0 !important;
    max-height: none !important;
     100%;
    height: 100%;
    image-orientation: 0deg
  }
  .cropper-wrap-box,
  .cropper-canvas,
  .cropper-drag-box,
  .cropper-crop-box,
  .cropper-modal {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
  .cropper-wrap-box {
    overflow: hidden;
  }
  .cropper-drag-box {
    opacity: 0;
    background-color: #fff;
  }
  .cropper-modal {
    opacity: .5;
    background-color: #000;
  }
  .cropper-view-box {
    display: block;
    overflow: hidden;
     100%;
    height: 100%;
    outline: 1px solid #39f;
    outline-color: rgba(51, 153, 255, 0.75);
  }
 
  .cropper-dashed {
    position: absolute;
    display: block;
    opacity: .5;
    border: 0 dashed #eee
  }
  .cropper-dashed.dashed-h {
    top: 33.33333%;
    left: 0;
     100%;
    height: 33.33333%;
    border-top- 1px;
    border-bottom- 1px
  }
  .cropper-dashed.dashed-v {
    top: 0;
    left: 33.33333%;
     33.33333%;
    height: 100%;
    border-right- 1px;
    border-left- 1px
  }
  .cropper-center {
    position: absolute;
    top: 50%;
    left: 50%;
    display: block;
     0;
    height: 0;
    opacity: .75
  }
  .cropper-center:before,
  .cropper-center:after {
    position: absolute;
    display: block;
    content: ' ';
    background-color: #eee
  }
  .cropper-center:before {
    top: 0;
    left: -3px;
     7px;
    height: 1px
  }
  .cropper-center:after {
    top: -3px;
    left: 0;
     1px;
    height: 7px
  }
  .cropper-face,
  .cropper-line,
  .cropper-point {
    position: absolute;
    display: block;
     100%;
    height: 100%;
    opacity: .1;
  }
  .cropper-face {
    top: 0;
    left: 0;
    background-color: #fff;
  }
  .cropper-line {
    background-color: #39f
  }
  .cropper-line.line-e {
    top: 0;
    right: -3px;
     5px;
    cursor: e-resize
  }
  .cropper-line.line-n {
    top: -3px;
    left: 0;
    height: 5px;
    cursor: n-resize
  }
  .cropper-line.line-w {
    top: 0;
    left: -3px;
     5px;
    cursor: w-resize
  }
  .cropper-line.line-s {
    bottom: -3px;
    left: 0;
    height: 5px;
    cursor: s-resize
  }
  .cropper-point {
     5px;
    height: 5px;
 
    opacity: .75;
    background-color: #39f
  }
  .cropper-point.point-e {
    top: 50%;
    right: -3px;
    margin-top: -3px;
    cursor: e-resize
  }
  .cropper-point.point-n {
    top: -3px;
    left: 50%;
    margin-left: -3px;
    cursor: n-resize
  }
  .cropper-point.point-w {
    top: 50%;
    left: -3px;
    margin-top: -3px;
    cursor: w-resize
  }
  .cropper-point.point-s {
    bottom: -3px;
    left: 50%;
    margin-left: -3px;
    cursor: s-resize
  }
  .cropper-point.point-ne {
    top: -3px;
    right: -3px;
    cursor: ne-resize
  }
  .cropper-point.point-nw {
    top: -3px;
    left: -3px;
    cursor: nw-resize
  }
  .cropper-point.point-sw {
    bottom: -3px;
    left: -3px;
    cursor: sw-resize
  }
  .cropper-point.point-se {
    right: -3px;
    bottom: -3px;
     20px;
    height: 20px;
    cursor: se-resize;
    opacity: 1
  }
  @media (min- 768px) {
    .cropper-point.point-se {
       15px;
      height: 15px
    }
  }
  @media (min- 992px) {
    .cropper-point.point-se {
       10px;
      height: 10px
    }
  }
  @media (min- 1200px) {
    .cropper-point.point-se {
       5px;
      height: 5px;
      opacity: .75
    }
  }
  .cropper-point.point-se:before {
    position: absolute;
    right: -50%;
    bottom: -50%;
    display: block;
     200%;
    height: 200%;
    content: ' ';
    opacity: 0;
    background-color: #39f
  }
  .cropper-invisible {
    opacity: 0;
  }
  .cropper-bg {
    background-image: url('data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQAQMAAAAlPW0iAAAAA3NCSVQICAjb4U/gAAAABlBMVEXMzMz////TjRV2AAAACXBIWXMAAArrAAAK6wGCiw1aAAAAHHRFWHRTb2Z0d2FyZQBBZG9iZSBGaXJld29ya3MgQ1M26LyyjAAAABFJREFUCJlj+M/AgBVhF/0PAH6/D/HkDxOGAAAAAElFTkSuQmCC');
  }
  .cropper-hide {
    position: absolute;
    display: block;
     0;
    height: 0;
  }
  .cropper-hidden {
    display: none !important;
  }
  .cropper-move {
    cursor: move;
  }
  .cropper-crop {
    cursor: crosshair;
  }
  .cropper-disabled .cropper-drag-box,
  .cropper-disabled .cropper-face,
  .cropper-disabled .cropper-line,
  .cropper-disabled .cropper-point {
    cursor: not-allowed;
  }
</style>