vue中图片转换为base64上传预览删除
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https://blog.csdn.net/przlovecsdn/article/details/80337738
<template> <div class="com-upload-img"> <div class="img_group"> <div class="img_box" v-if="allowAddImg"> <input type="file" accept="image/*" multiple="multiple" @change="changeImg($event)"> <div class="filter"></div> </div> <div class="img_box" v-for="(item,index) in imgArr" :key="index"> <div class="img_show_box"> <img :src="item" alt=""> <i class="img_delete" @click="deleteImg(index)"></i> <!-- <i class="img_delete" @click="imgArr.splice(index,1)"></i> --> </div> </div> </div> </div> </template> <script> export default { name:\'ComUpLoad\', data () { return { imgData:\'\', imgArr:[], imgSrc:\'\', allowAddImg:true, } }, methods: { changeImg: function(e) { var _this = this; var imgLimit = 1024; var files = e.target.files; var image = new Image(); if(files.length>0){ var dd = 0; var timer = setInterval(function(){ if(files.item(dd).type != \'image/png\'&&files.item(dd).type != \'image/jpeg\'&&files.item(dd).type != \'image/gif\'){ return false; } if(files.item(dd).size>imgLimit*102400){ //to do sth }else{ image.src = window.URL.createObjectURL(files.item(dd)); image.onload = function(){ // 默认按比例压缩 var w = image.width, h = image.height, scale = w / h; w = 200; h = w / scale; // 默认图片质量为0.7,quality值越小,所绘制出的图像越模糊 var quality = 0.7; //生成canvas var canvas = document.createElement(\'canvas\'); var ctx = canvas.getContext(\'2d\'); // 创建属性节点 var anw = document.createAttribute("width"); anw.nodeValue = w; var anh = document.createAttribute("height"); anh.nodeValue = h; canvas.setAttributeNode(anw); canvas.setAttributeNode(anh); ctx.drawImage(image, 0, 0, w, h); var ext = image.src.substring(image.src.lastIndexOf(".")+1).toLowerCase();//图片格式 var base64 = canvas.toDataURL("image/"+ext, quality ); // 回调函数返回base64的值 if(_this.imgArr.length<=4){ _this.imgArr.unshift(\'\'); _this.imgArr.splice(0, 1, base64);//替换数组数据的方法,此处不能使用:this.imgArr[index] = url; if(_this.imgArr.length>=5){ _this.allowAddImg = false; } } } } if(dd<files.length-1){ dd++; }else{ clearInterval(timer); } },1000) } }, deleteImg: function(index){ this.imgArr.splice(index,1); if(this.imgArr.length<5){ this.allowAddImg = true; } }, }, } </script>
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