cropper js基于vue的圖片裁剪上傳功能的實(shí)現(xiàn)代碼

npm install cropper js --save

<template> 
 <div id="demo"> 
 <!-- 遮罩層 --> 
 <div class="container" v-show="panel"> 
 <div> 
  <img id="image" :src="url" alt="Picture"> 
 </div> 
 <button type="button" id="button" @click="commit">確定</button> 
 <button type="button"id="cancel" @click="cancel">取消</button> 
 </div> 
 <div > 
 <div class="show"> 
  <div class="picture" :> 
  </div> 
 </div> 
 <div > 
  <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() { 
 //初始化這個(gè)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: { 
 //取消上傳 
 cancel() { 
 this.panel = false; 
 var obj = document.getElementById('change') ; 
 obj.outerHTML=obj.outerHTML; 
 }, 
 //創(chuàng)建url路徑 
 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，獲取到上傳的文件 
 change(e) { 
 let files = e.target.files || e.dataTransfer.files; 
 if (!files.length) return; 
 let type = files[0].type; //文件的類型，判斷是否是圖片 
 let size = files[0].size; //文件的大小，判斷圖片的大小 
 if (this.imgCropperData.accept.indexOf(type) == -1) { 
 alert("請(qǐng)選擇我們支持的圖片格式！"); 
 return false; 
 } 
 if (size > 5242880) { 
 alert("請(qǐng)選擇5M以內(nèi)的圖片！"); 
 return false; 
 } 
 this.picValue = files[0]; 
 this.url = this.getObjectURL(this.picValue); 
 //每次替換圖片要重新得到新的url 
 if (this.cropper) { 
 this.cropper.replace(this.url); 
 } 
 this.panel = true; 
 }, 
 //確定提交 
 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(); 
 //上傳圖片 
 this.postImg(); 
 }, 
 //canvas畫圖 
 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; 
 }, 
 //提交上傳函數(shù) 
 postImg() { 
 alert("上傳成功"); 
 //這邊寫圖片的上傳 
 } 
 }