ECMAScript 定义类或对象有很多方法，W3SCHOOL总结了6中方法供学习：  工厂方式 原始的方式 因为对象的属性可以在对象创建后动态定义，所有许多开发者都在 JavaScript 最初引入时编写类似下面的代码： var oCar = new Object; oCar.color = "blue"; oCar.doors = 4; oCar.mpg = 25; oCar.showColor = function() ...

Features Multiple file upload（多文件上传）: Allows to select multiple files at once and upload them simultaneously. Drag & Drop support（支持D&D操作）: Allows to upload files by dragging them from your desktop or filemanager and dropping them ...

这样URLConnection connection timeout一个问题： 代码： URL url= new URL(urlString); URLConnection conn=url.openConnection(); 异常问题： java.net.ConnectException: Connection timed out: connect at java.net.DualStackPlainSocketImpl.connect0(Native ...