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JavaScript, aka Mocha, aka LiveScript, aka JScript, aka ECMAScript, is one of the world's most popular programming languages. Virtually every personal computer in the world has at least one JavaScript interpreter installed on it and in active use. JavaScript's popularity is due entirely to its role a ...
- 2009-10-27 16:25
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在当前流行的Ajax框架源码会看到如下代码:
window.undefined = window.undefined;
或者
window['undefined'] = window['undefined'];
简单的说就是给window对象的undefined子对象赋上undefined, 在较老的浏览器window对象并没有undefined这个子对象, 所以如果使用到undefined的操作将会导致异常, 故采用window.undefined = window.undefined; 咋一看, 写法有点BT, 无法理解。在老版本的IE中windo ...
- 2009-10-22 11:29
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