精细上传器-在上传每个文件之前向服务器添加一个asyc请求?

这个 onSubmit 回调接受“thenable”返回值。换句话说,您可以返回 Promise ,Fine Uploader将在继续执行该文件的下一步之前等待,直到返回的承诺得到解决或被拒绝。例如:

var uploader = new qq.FineUploader({
   callbacks: {
      onSubmit: function(id, name) {
         return new Promise(function(resolve, reject) {
            // Send request to server, resolve() on success
            // ... reject() on failure.
            // Call this.setParams(tokenData, id)
            // ...to send the token w/ the upload request.
         })
      }
   }
})