悟心

<SCRIPT LANGUAGE="javascript" type="text/javascript">
function frmValid(obj)
{
     // Elements array, initialization for validation
    elems = new Array(
        new Array(
            'username',  // name of elements to be validated
            'value.length<1 || value.search(/[^a-zA-z0-9_]/)>=0',
                         // validation condition
            '无效的用户名:只能输入6-20位字母、数字、下划线的组合!'),
                         // prompt on failure
        new Array(
            'password',
            'value.length<5 || value.search(/[^a-zA-z0-9_]/)>=0',
            '无效的密码:只能输入6-20位字母、数字、下划线的组合!'),
        new Array(
            'email',
            'isMail(value)==false',
            'Email是您在网上的重要联络工具,请务必正确填写!')
    );

    // Validate here, using eval statement.
    for(i = 0; i < elems.length; i++)
    {
        with(eval('obj.'+elems[i][0]))
        {
            if(eval(elems[i][1]))
            {
                window.alert(elems[i][2]);
                focus();
                return false;
            }
        }
    }
    return true;
}
//-->
</SCRIPT>
　　2、为form添加onsubmit属性：
　　<form ... onsubmit='return frmValid(this)'>