图片上传最大张数限制

是的，既然图片是多张上传，肯定需要数量限制嘛，不然整个几百张那也得炸… 因此可以用到max-count这个方法限制，具体方法如下：

 <van-uploader v-model="fileList" :multiple="multipleFalse" max-count="20" preview-size="9.33vw" :after-read="handlerAfterRead" upload-icon="https://kcallme-mall.oss-cn-beijing.aliyuncs.com/images/8508f79b2da948c6a383c5a8bac0faf1..png">
          
            <div class="pic_panel append_wall_btn">
              <img class="append_wall_btn_2" src="https://kcallme-mall.oss-cn-beijing.aliyuncs.com/images/8508f79b2da948c6a383c5a8bac0faf1..png">
            </div>
          </van-uploader>

上传方法
官方给出的上传回调有很多种，before-read after-read before-delete 结合需求以及代码优化 我们这里只用到了 after-read 亲测好用

:after-read="handlerAfterRead"

  async handlerAfterRead(file,detail){
      
      if(Array.isArray(file)){
				//这次真是要吐槽一下vant组件 真心没有element好用  
				//element 上传地址可以直接写到组件里 vant还要在方法里写上传的接口地址
					file.forEach((item,index)=>{
						let data = new FormData();
						data.append('file', item.file, item.file.name);
            const that = this;
            const token = localStorage.getItem("token");
            $.ajax({
              url: process.env.baseUrl + '/file/upload/imgs',
              type: 'POST',
              data: data,
              cache: false,
              headers:{
                Authorization: "" + token
              },
              processData: false,
              contentType: false,
              success:function(d){
                console.log("d=>",d.data);
                that.groupForm.fileList.push(d.data);
                  if(that.groupForm.fileList.length >=4){
                    that.hasFourImg = 'position:absolute;right:0'

                  }
                  console.log('====',that.groupForm.fileList)
              }
            });
						return true;
					})
				}else{
          var data = new FormData();
          data.append('file', file.file);
          const that = this;
          const token = localStorage.getItem("token");
          $.ajax({
            url: process.env.baseUrl + '/file/upload/img',
            type: 'POST',
            data: data,
            cache: false,
            headers:{
              Authorization: "" + token
            },
            processData: false,
            contentType: false,
            success:function(d){
              console.log("d=>",d.data);
              that.groupForm.fileList.push(d.data);
                  if(that.groupForm.fileList.length >=4){
                    that.hasFourImg = 'position:absolute;right:0'

                  }
            }
          });
        }
    },