vue上传图片组件编写代码

<input @change="fileChange($event)" type="file" id="upload_file" multiple style="display: none"/> 

document.getElementById('upload_file').click() 

fileChange(el){ 
 if (!el.target.files[0].size) return;//判断是否有文件数量 
 this.fileList(el.target.files);//获取files文件组传入处理 
 el.target.value = ''//清空val值，以便可以重复添加一张图片 
 } 

fileList(files){ 
 for (let i = 0; i < files.length; i++) { 
 this.fileAdd(files[i]); 
 } 
 } 

fileAdd(file){ 
 this.size = this.size + file.size;//总大小 
 let reader = new FileReader(); 
 reader.vue = this; 
 reader.readAsDataURL(file); 
 reader.onload = function () { 
 file.src = this.result; 
 this.vue.imgList.push({ 
 file 
 }); 
 } 
 }, 

bytesToSize(bytes){ 
 if (bytes === 0) return '0 B'; 
 let k = 1000, // or 1024 
 sizes = ['B', 'KB', 'MB', 'GB', 'TB', 'PB', 'EB', 'ZB', 'YB'], 
 i = Math.floor(Math.log(bytes) / Math.log(k)); 
 return (bytes / Math.pow(k, i)).toPrecision(3) + ' ' + sizes[i]; 
 }, 

<div class="upload_warp_right" @drop="drop($event)" @dragenter="dragenter($event)" @dragover="dragover($event)"> 
 或者将文件拖到此处 
</div> 

dragenter(el){ 
 el.stopPropagation(); 
 el.preventDefault(); 
 }, 
 dragover(el){ 
 el.stopPropagation(); 
 el.preventDefault(); 
 }, 
 drop(el){ 
 el.stopPropagation(); 
 el.preventDefault(); 
 this.fileList(el.dataTransfer.files); 
 }