本插件是为输入用户名的提示信息而写的。功能虽然简单但对于做开发的人来说每次写这几行代码也实属繁琐，所以我就把这几行代码写成了jquery的插件以求以后用起来更加便捷。

简单说明：

1.可以自动默认提示信息，若不设置则默认值为：用户名/邮箱

2.当input获得焦点时，input的值会被自动清除；当input失去焦点时，会判断输入值与默认值是否一致，如果一致（或空）则再次显示默认提示信息，若不一致（已输入信息）则input值为所输入值

3.此插件是jquery插件，调用方式为 * $( #xxx ).autoTip() 并可以指定input获得焦点和失去焦点的CSS样式-This plugin is written for the prompt message of the user name. Simple function, but for the development of the people who write these lines of code each time is also very cumbersome, so I put these lines of code written in the jQuery plug-ins in order to use more convenient later.

Simple descr iption:

1 can automatically default prompt information, if you do not set the default value is: user name/mailbox

2. When the input focus, the input value will be automatically cleared　when the input to lose focus, will determine the input values and default values are consistent, if consistent (or null) again shows the default message. If not (input) is input values for the input value

3 this plugin is the jQuery plug-in, called* $( #xxx ).AutoTip ()　and you can specify the input to get the focus and lose the focus of the CSS style