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如下是例子
<input name="ctl00$ContentPlaceHolder1$txt_mn" type="text" maxlength="20" id="ctl00_ContentPlaceHolder1_txt_mn" onbeforepaste="clipboardData.setData
('text',clipboardData.getData('text').replace(/[^\d]/g,''))" onkeyup="value=value.replace(/['\t]/g,'').replace(/\s*/g, '') " style="width:240px;LEFT: 3px;"
/>
下边例子是限制只能输入数字
<input name="ctl00$ContentPlaceHolder1$txt_mn" type="text" maxlength="20" id="ctl00_ContentPlaceHolder1_txt_mn" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" onkeyup="value=value.replace(/[^0-9]/g,'') " style="width:240px;LEFT: 3px;" />
下边例子是只能输入数字和英文和下划线
<input name="ctl00$ContentPlaceHolder1$txt_user_name" type="text" maxlength="12" id="ctl00_ContentPlaceHolder1_txt_user_name" onbeforepaste="clipboardData.setData('text',clipboardData.getData('text').replace(/[^\d]/g,''))" onkeyup="value=value.replace(/[^a-z 0-9 -]/g,'') " style="width:128px;LEFT: 0px; TOP: 0px" />
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