vue图片上传组件使用详解

// 上传操作
onUpload (e) {
 let photoFile = e.target
 let val = e.target.value
 // 判断是否符合上传条件
 if (photoFile.files.length === 0) return false
 for (let i = 0; i < photoFile.files.length; i++) {
 this.fileAdd(photoFile.files[i],i)
 }
}

// 添加图片
fileAdd (file,index) {
 let csrf_token = this.getCookie('XSRF-TOKEN');
 let formFile = new FormData();
 let imgName = 'img0';
 formFile.append(imgName, file);
 formFile.append("_token", csrf_token);
 let name = file.name
 let size = file.size
 let types = '.jpg,.jpeg,.png,.gif' //文件格式
 let fileExt = name.substring(name.lastIndexOf('.')).toLowerCase()
 let result = types.indexOf(fileExt)
 if (result < 0) {  //验证图片格式
 this.$dialog.toast({
  mes: '图片格式不正确',
  timeout: 1000
 })
 return false
 }
 if (size > 1 * 1024 * 1024) {
 this.$dialog.toast({
  mes: '图片大小不能大于1M',
  timeout: 1000
 })
 return false
 }
 if (this.fileList.length >= this.uploadNum) {
 this.$dialog.toast({
  mes: '图片最多只能上传' + this.uploadNum + '张',
  timeout: 1000
 })
 return false
 }

 axios.post(this.upUrl,formFile)
 .then((res) => {
  this.upNum = this.fileList.length + 1; //计算图片数量
  this.fileList.push(file);    //添加进图片数组
  let imgUrl = this.showUrl + res.data.data; //图片回显地址
  let upImg = res.data.data;    //传给后台的图片地址
  this.imgList.push(imgUrl);
  this.upImgList.push(upImg);
  let upImgAll = this.upImgList.join(',');
  this.$emit('input', upImgAll);
 }).catch((err) => {
  console.log(err);
 })
},

// 删除图片
delImg (index) {
 this.imgList.splice(index, 1);
 this.fileList.splice(index, 1);
 this.upNum = this.imgList.length;
 let imgAll = this.imgList.join(',');
 this.$emit('input', imgAll);
},

watch: {
 imgList () {
  this.$emit('changeNum'); //触发父组件中验证资料是否完整的方法
 }
 },