很多老的项目用ajaxupload 上传文件，但chrome浏览器升级到83版本后，oncomplete 方法就失效了。

查看了ajaxupload源码后，Github:Ajaxupload.js

_createIframe: function(){

// We can't use getTime, because it sometimes return

// same value in safari :(

var id = getUID();

// We can't use following code as the name attribute

// won't be properly registered in IE6, and new window

// on form submit will open

// var iframe = document.createElement('iframe');

// iframe.setAttribute('name', id);

var iframe = toElement('');

// src="javascript:false; was added

// because it possibly removes ie6 prompt

// "This page contains both secure and nonsecure items"

// Anyway, it doesn't do any harm.

iframe.setAttribute('id', id);

iframe.style.display = 'none';

document.body.appendChild(iframe);

return iframe;

},

把var iframe = toElement('');

改成var iframe = toElement('');后，

oncomplete恢复正常。

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原文链接：https://blog.csdn.net/kansousama/article/details/106427773