vant Uploader 文件上传，自定义参数

uploader在多组件中传参index，方便val赋值(由服务器返回的url地址)

template：

<van-uploader :after-read="afterRead(itm)" v-model="itm.imgs" :max-count="maxImgCount" :disabled="disabled"
          ></van-uploader>

js:itm是传入进来的，方便val赋值。file是after-read 文件读取完成后的回调函数所带的默认参数

 afterRead(itm) { return file => { this.$toast.loading({ duration: 0 }); this.axios({ method: "post", url: "/api/Upload/List", data: JSON.stringify({ Id: file.content }) }) .then(({ code, data, msg }) => { this.$toast.clear(); if (code >= 0) { var imgs = itm.imgs || []; var i = imgs.length; if (i <= 0) { imgs = [{ url: data }]; } else { imgs[i - 1] = { url: data }; } itm.imgs = imgs; var url = []; for (const row of imgs) { url.push(row.url); } itm.Val = url.join(","); } else { this.$toast(msg); } }) .catch(err => { this.$toast.clear(); this.$toast(`${err}`); }); }; }