1、非负整数：^\d+$

2、正整数：^[0-9]*[1-9][0-9]*$

3、非正整数：^((-\d+)|(0+))$

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//@desc    load a page(some html) via xmlhttp,and display on a container
//@param   url          the url of the page will load,such as "index.php"
//@param   request      request string to be sent,such as "action=1&name=surfchen"
//@param   method       POST or GET
//@param   container          the container object,the loaded page will display in container.innerHTML

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