js 前端表单验证

最终效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>表单验证</title>
    <style type="text/css">
        body,td,th {
            font-size: 12px;
            color: #000000;
        }
        body {
            background-color: #CCCCCC;
            margin-left: 0px;
            margin-top: 0px;
        }
        a {
            font-size: 12px;
            color: #666600;
        }
        a:link {
            text-decoration: none;
        }
        a:visited {
            text-decoration: none;
            color: #000099;
        }
        a:hover {
            text-decoration: underline;
            color: #6633FF;
        }
        a:active {
            text-decoration: none;
            color: #00FF00;
        }
    </style>
</head>
<body alink="center">
<form id="form1" name="form1" method="post" action="ttt.jsp" onsubmit="return checkform()">
    <table width="777" border="0" cellpadding="1" cellspacing="1">
        <tr>
            <td colspan="3" ><div align="center">请输入你的注册信息</div></td>
        </tr>
        <tr>
            <td width="250" ><div align="right" >请输入你的用户名：</div></td>
            <td width="250"><div align="center">
                <input type="text" name="username" onblur="checkusername()" />
            </div></td>
            <td><div id="errusername" align="center"></div></td>
        </tr>
        <tr>
            <td width="250"><div align="right">请输入你的年龄：</div></td>
            <td width="250"><div align="center" >
                <label>
                    <input type="text" name="age" onblur="checkage()"/>
                </label>
            </div></td>
            <td><div align="center" id="errage"></div></td>
        </tr>
        <tr>
            <td width="250"><div align="right" >请输入你的EMAIL:</div></td>
            <td width="250"><div align="center" >
                <label>
                    <input type="text" name="email" onblur="checkemail()" />
                </label>
            </div></td>
            <td><div align="center" id="erremail"></div></td>
        </tr>
        <tr>
            <td><div align="right">
                <label>
                    <input type="submit" name="Submit" value="提交" />
                </label>
            </div></td>
            <td><div align="center">
                <label>
                    <input type="reset" name="Submit2" value="重置" />
                </label>
            </div></td>
            <td><div align="center"></div></td>
        </tr>
    </table>
</form>
</body>
</html>
<script type="text/javascript">
    function checkusername()
    {
        var myform = document.getElementById("form1");
        var username = myform.username.value.length;
        if(username < 1||username>12)
        {
            errusername.innerHTML = "<font color='red'>用户名不符合要求</font>";
            return false;
        }else{
            errusername.innerHTML = "<font color='green'>用户名符合要求</font>";
            return true;
        }
    }
    function checkage()
    {
        var myform = document.getElementById("form1");
        var age = myform.age.value;
        if(age != parseInt(age))
        {
            errage.innerHTML = "<font color='red'>年龄不符合要求</font>";
            return false;
        }else{
            errage.innerHTML = "<font color='green'>年龄符合要求</font>";
            return true;
        }
    }
    function checkemail()
    {
        var myform = document.getElementById("form1");
        var mail=/^[A-Za-z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$/;
        if(!mail.test(myform.email.value))
        {
            erremail.innerHTML = "<font color='red'>email不符合要求</font>";
            return false;
        }else{
            erremail.innerHTML = "<font color='green'>email符合要求</font>";
            return true;
        }
    }
    function checkform()
    {
        checkusername();checkage();checkemail();
        if(checkusername()&&checkage()&&checkemail())
        {
            return true;
        }else{
            return false;
        }
    }
</script>
最终效果

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