如题所述
验证输入是否为空!! <script language="javascript">function userid_check(){if (Form1.userid.value==""){alert('姓名不能为空');Form1.userid.focus();return false;}if(Form1.userid.value.length<2){alert('stop');Form1.userid.focus();//聚焦return false;}if (Form1.Textbox1.value!="123456"){alert('应该输入123456');Form1.Textbox1.focus();return false;}else{alert('成功!!');}}</script></HEAD><body MS_POSITIONING="GridLayout"><form id="Form1" method="post" runat="server" onsubmit="return userid_check();"> 其中userid,Textbox1 为两个文本框,还有一个button按钮!! onsubmit="return userid_check();"重要如果在页面代码里写 Button1.Attributes["onclick"]=("return userid_check();");去掉onsubmit="return userid_check();"这样的话,没有办法聚焦!!(疑问!!!!)
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