JS实现全选和取消全选.

在网上经常看到有很多人问用checkbox实现全选和取消全选的功能。网上也有不少朋友提供了很多实现的方法和代码。有些是使用两个checkbox实现的，一个做全选，一个做取消；还有一些是实现起来使用的JS代码比较多；更有一些只能用一个checkbox实现全选。附件是自己经常使用的一段实现此功能的实例。仅供参考，不足之足请高手指点。-For full selection and cancellation JS Select. In the Internet often see many people have asked for full selection with checkbox and cancel all selected features. Online there are a lot of friends means a lot to achieve and code. Some are using two checkbox to achieve, a make Select a make cancellation　have some JS code used to achieve them more　and some can only be achieved with a checkbox to select all. Annex is a realization of their own frequently used example of this feature. For information purposes only, less than the full please master guiding.