cropper js基于vue的图片裁剪上传功能的实现代码

npm install cropper js --save

<template>  <div id="demo">  <!-- 遮罩层 -->  <div class="container" v-show="panel">  <div>   <img id="image" :src="url" </div>  <button type="button" id="button" @click="commit">确定</button>  <button type="button"id="cancel" @click="cancel">取消</button>  </div>  <div style="padding:20px;">  <div class="show">   <div class="picture" :style="'backgroundImage:url('+headerImage+')'">   </div>  </div>  <div style="margin-top:20px;text-align: left;">   <input type="file" id="change" accept="image" @change="change">   <label for="change"></label>  </div>  </div>  </div> </template> 

data() {  return {  headerImage: "",  picValue: "",  cropper: "",  croppable: false,  panel: false,  url: "",  imgCropperData: {  accept: "image/gif, image/jpeg, image/png, image/jpg"  }  };  } 

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,  background: false,  zoomable: false,  ready: function() {  self.croppable = true;  }  });  } 

methods: {  //取消上传  cancel() {  this.panel = false;  var obj = document.getElementById('change') ;  obj.outerHTML=obj.outerHTML;  },  //创建url路径  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;  },  //input框change事件，获取到上传的文件  change(e) {  let files = e.target.files || e.dataTransfer.files;  if (!files.length) return;  let type = files[0].type; //文件的类型，判断是否是图片  let size = files[0].size; //文件的大小，判断图片的大小  if (this.imgCropperData.accept.indexOf(type) == -1) {  alert("请选择我们支持的图片格式！");  return false;  }  if (size > 5242880) {  alert("请选择5M以内的图片！");  return false;  }  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;  },  //确定提交  commit() {  this.panel = false;  var croppedCanvas;  var roundedCanvas;  if (!this.croppable) {  return;  }  // Crop  croppedCanvas = this.cropper.getCroppedCanvas();  // Round  roundedCanvas = this.getRoundedCanvas(croppedCanvas);  this.headerImage = roundedCanvas.toDataURL();  //上传图片  this.postImg();  },  //canvas画图  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;  },  //提交上传函数  postImg() {  alert("上传成功");  //这边写图片的上传  }  }