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        XmlHttpRequest onprogress 间隔

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                  本文介绍了XmlHttpRequest onprogress 间隔的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!


                  我正在使用 XmlHttpRequests 将图像上传到服务器,我想向用户显示这些上传的进度.

                  I'm using XmlHttpRequests to upload images to a server and I'd like to show the user the progress of these uploads.

                  不幸的是,对我的 onprogress-event 处理程序的调用之间的间隔太大.对于 500k 的图像,通常只调用一次或两次 onprogress.

                  Unfortunately the interval between calls to my onprogress-event handler is too large. Usually onprogress is called only once or twice for a 500k image.


                  /* This function is not called often enough */
                  function progress(e){
                      console.log('Uploading: ' + Math.round((e.loaded / e.total) * 100) + ' %');
                  var xhr = new XMLHttpRequest();
                  xhr.upload.addEventListener('progress', progress, false);


                  Can this behaviour be changed or is this hardcoded somewhere in the browser implementation?


                  W3 在他们的 XMLHttpRequest 级别 2 文档.显然,跨浏览器的不同级别的一致性是可以预料的.

                  The W3 sets forth the following guidelines in their XMLHttpRequest Level 2 document. Obviously varying levels of conformance across browsers are to be expected.


                  当请求实体正文被上传并且上传完成标志为假时,排队一个任务以在 XMLHttpRequestUpload 对象上触发一个名为 progress 的进度事件,大约每 50 毫秒或传输的每个字节,以最不频繁的为准.- W3 XMLHttpRequest Level 2(粗体表示强调)

                  While the request entity body is being uploaded and the upload complete flag is false, queue a task to fire a progress event named progress at the XMLHttpRequestUpload object about every 50ms or for every byte transmitted, whichever is least frequent. - W3 XMLHttpRequest Level 2 (Bolded for emphasis)


                  如果说要发出进度通知,则在下载过程中,排队一个任务以触发一个名为 progress 的进度事件,大约每 50 毫秒或接收到的每个字节,以最不频繁的为准.- W3 XMLHttpRequest Level 2(粗体表示强调)

                  When it is said to make progress notifications, while the download is progressing, queue a task to fire a progress event named progress about every 50ms or for every byte received, whichever is least frequent. - W3 XMLHttpRequest Level 2 (Bolded for emphasis)

                  我不知道自定义此功能的 api.

                  I am not aware of an api to customize this functionality.

                  这篇关于XmlHttpRequest onprogress 间隔的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持html5模板网!

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