夜深了。我直接貼代碼吧，好困- -

  <el-upload
    v-for="(item, key, index) in tags"
    :key="item+key+index"
    class="avatar-uploader"
    action="http://upload-z2.qiniu.com/"
    :show-file-list="false"
    :on-success="handleAvatarSuccess"
    :data="qiniuToken"
  >
    <img v-if="imageUrl" :src="imageUrl" class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon"></i>
  </el-upload>

js

data() {
    return {
        imageUrl: '',
        qiniuToken: {
            token: ''
        }
    }
},
methods: {
    //想知道觸發(fā)了哪個el-upload,想獲取下標
    handleAvatarSuccess(res, file, fileList) {
      console.log(res,'res', fileList, 'fileList',file, 'file')
      // console.log(index,'index')
      this.imageUrl = URL.createObjectURL(file.raw);
    }
}

想知道觸發(fā)了哪個el-upload,想獲取index,大概的需求就是這樣子。
el-upload文檔