说明：  javascript 的常用方法，很实用，从网上收集而来。本人没有验证过里面所有的方法，而javascript 代码又是出错比较多的地方，所以仅供大家参考。谢谢。
(javascript commonly used method, very practical, the collection comes from the Internet. I have not verified all the way inside, while the javascript code is wrong are more places, so only for your reference.谢谢.)