1.html<ul class="uploadUl"> // 第一li用于回显图片，上传接口图片成功后通过canvas进行绘制回显图片。 第二个li 用于选择文件上传<li style="display: inline-block" v-for="(src,index) in files"><img @click="ImageToCanvas(src)" class='preview' :src="src"><img class="close" @click="close(index,0)" src="../../../../static/img/closea.png">   // 关闭图层</li><li style="display: inline-block" class="roomDiv" @click="chooseImg(0)" v-if="this.files.length<1"><input type='file' name="doc" ref="choose" accept="image/*"  @change='setImagePreview($event,0)' hidden/>  //hidden,隐藏原始的丑陋的input type='file'<img class="roomIMG" src="../../../../static/img/roomPaizhao.png">     // 自行配置背景图片</li></ul>

ImageToCanvas(image) {// 图片绘制事件，此方法可共用
            console.log(image)let canvas = document.createElement("canvas");canvas.width = image.width;canvas.height = image.height;canvas.getContext("2d").drawImage(image, 0, 0);//0, 0参数画布上的坐标点，图片将会拷贝到这个地方return canvas;
},

chooseImg(index) {// 上传图片的点击事件，可传参  console.log(index)  if(index === 0){    this.$refs.choose.click();  }else if(index === 1){    this.$refs.choose1.click();  }},

// 封装一个方法upIMGAjax

upIMGAjax(fileList,imgIndex){  // 上传图片的路径和id  console.log(fileList)  const that = this ;  let formData = new FormData();  formData.append('file', fileList)  let use = sessionStorage.getItem('userName') ;  formData.append('uploadUserId', use)  this.uploadFileRequest('',formData).then(res =>{    if(res.data.code === 200){       if(imgIndex === 0){         that.roomImgId = res.data.data.id ;         that.roomImgUrl = res.data.data.path ;         sessionStorage.setItem("roomImgId", res.data.data.id);         console.log(that.roomImgId,'roomId')       }       else if(imgIndex === 1){         that.IDimgId = res.data.data.id ;         that.IDimgUrl = res.data.data.path ;       }

    }else{       that.$Toast(res.data.message);    }  }).catch(res => {    // console.log(res)  })},

// 图片绘制 (关键函数)

setImagePreview(event,index) {  // 图片的绘制  const that = this ;  if(index === 0){    this.file.push(event.target.files[0])    // e.target.files[0] 目标文件，固定files不能变名字。    this.files.push(window.URL.createObjectURL(event.target.files[0]))    let filess = event.target.files || event.dataTransfer.files    if (this.files.length === 0) return;    this.createImage(filess, event);    this.upIMGAjax(event.target.files[0],0)  }else if(index === 1){    this.file1.push(event.target.files[0])    this.files1.push(window.URL.createObjectURL(event.target.files[0]))    let filess = event.target.files || event.dataTransfer.files    if (this.files1.length === 0) return;    this.createImage(filess, event)    this.upIMGAjax(event.target.files[0],1)  }},

// 上传之前的图片的压缩插件lrz

createImage(file, event) {  // 图片的压缩  let _this = this  this.lrz(file[0], {    width: 100,    quality: .5  }).then(function (rst) {    _this.file.push(rst.base64)    return rst;  }).always(function () {    event.target.value = null;  })},

// 关闭图层

close(val,index) {  // 上传图片的关闭事件  if(index === 0){    this.files.splice(val, 1);  }else if(index === 1){    this.files1.splice(val, 1);  }},