JavaScript 完成注册页面表单校验的实例

1、步骤分析

第一步：确定事件(onsubmit)并为其绑定一个函数

第二步：书写这个函数(获取用户输入的数据<获取数据时需要在指定位置定义一个 id>)

第三步：对用户输入的数据进行判断

第四步：数据合法(让表单提交)

第五步：数据非法(给出错误提示信息，不让表单提交)

问题：如何控制表单提交？

关于事件 onsubmit：一般用于表单提交的位置，那么需要在定义函数的时候给出一个 返回值。

onsubmit = return checkForm()

2、完成注册页面表单校验

<!DOCTYPE html>
<html>
 <head>
  <meta charset="UTF-8">
  <title>注册页面</title>
  <script>
   function checkForm(){
    //alert("aa");

    /**校验用户名*/
    //1.获取用户输入的数据
    var uValue=document.getElementById("user").value;
    //alert(uValue);
    if(uValue==""){
     //2.给出错误提示信息
     alert("用户名不能为空");
     return false;
    }

    /**校验密码*/
    var pValue=document.getElementById("password").value;
    if(pValue==""){     //注意空的表示方法
     alert("密码不能为空");
     return false;
    }

    /** 校验确认密码*/
    var rpValue=document.getElementById("repassword").value;
    if(rpValue!=pValue){
     alert("两次密码输入不一致！");
     return false;
    }

    /**校验邮箱*/
    var eValue=document.getElementById("email").value;
    if(！/^([a-zA-Z0-9_-])+@([a-zA-Z0-9_-])+(.[a-zA-Z0-9_-])+/.test(eValue)){
     alert("邮箱格式不正确！");
    }
   }
  </script>
 </head>
 <body>
  <table border="1px" align="center" width="1300px" cellpadding="0px" cellspacing="0px">

   <!--1.logo部分-->
   <tr>
    <td>
     <!--嵌套一个一行三列的表格-->
     <table border="1px" width="100%">
      <tr height="50px">
       <td width="33.3%">
        <img src="../img/logo2.png" height="47px" />
       </td>
       <td width="33.3%">
        <img src="../img/header.png" height="47px"/>
       </td>
       <td width="33.3%">
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >登录</a>
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >注册</a>
        <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >购物车</a>
       </td>
      </tr>
     </table>
    </td>
   </tr>

   <!--2.导航栏部分-->
   <tr height="50px" >
    <td bgcolor="black">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font size="3" color="white">首页</font></a>       
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">手机数码</font></a>        
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">电脑办公</font></a>       
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">鞋靴箱包</font></a>       
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font color="white">家用电器</font></a>
    </td>
   </tr>

   <!--3.注册表单-->
   <tr>
    <td height="600px" background="../img/regist_bg.jpg">
     <!--嵌套一个十行二列的表格-->
     <form action="#" method="get" name="regForm" onsubmit="return checkForm()">
     <table border="1px" width="750px" height="400px" align="center" cellpadding="0px" cellspacing="0px" bgcolor="white">
      <tr height="40px">
       <td colspan="2">
        <font size="4">会员注册</font>   USER REGISTER
       </td>
      </tr>
      <tr>
       <td>用户名</td>
       <td>
        <input type="text" name="user" size="35px" id="user"/>
       </td>
      </tr>
      <tr>
       <td>密码</td>
       <td>
        <input type="password" name="password" size="35px" id="password"/>
       </td>
      </tr>
      <tr>
       <td>确认密码</td>
       <td>
        <input type="password" name="repassword" size="35px" id="repassword"/>
       </td>
      </tr>
      <tr>
       <td>E-mail</td>
       <td>
        <input type="text" name="e-mail" size="35px" id="email"/>
       </td>
      </tr>
      <tr>
       <td>姓名</td>
       <td>
        <input type="text" name="username" size="35px"/>
       </td>
      </tr>
      <tr>
       <td>性别</td>
       <td>
        <input type="radio" name="sex" value="男"/>男
        <input type="radio" name="sex" value="女"/>女
       </td>
      </tr>
      <tr>
       <td>出生日期</td>
       <td>
        <input type="text" name="birthday" size="35px"/>
       </td>
      </tr>
      <tr>
       <td>验证码</td>
       <td>
        <input type="text" name="yzm" />
        <img src="../img/yanzhengma.png" />
       </td>
      </tr>
      <tr align="center">
       <td colspan="2">
        <input type="submit" value="注册" />
       </td>
      </tr>
     </table>
     </form>
    </td>
   </tr>

   <!--4.广告图片-->
   <tr>
    <td>
     <img src="../img/footer.jpg" width="100%"/>
    </td>
   </tr>

   <!--5.友情链接和版权信息-->
   <tr>
    <td align="center">
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>关于我们</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>联系我们</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>招贤纳士</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>法律声明</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>友情链接</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>支付方式</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>配送方式</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>服务声明</font></a>
     <a href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><font>广告声明</font></a>
     <p>
      Copyright © 2005-2016 hh商城 版权所有
     </p>
    </td>
   </tr>
  </table>
 </body>
</html>

在校验确认密码这部分使用了正则表达式（不需要记忆，需要时查找文档）

正则式.test(校验对象)为真表示符合条件，为假则不符合。

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