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新建html文档。

书写html。

<div class="reg_div">

    <p>注册</p>

    <ul class="reg_ul">

      <li>

          <span>用户名：</span>

          <input type="text" name="" value="" placeholder="4-8位用户名" class="reg_user">

          <span class="tip user_hint"></span>

      </li>

      <li>

          <span>密码：</span>

          <input type="password" name="" value="" placeholder="6-16位密码" class="reg_password">

          <span class="tip password_hint"></span>

      </li>

      <li>

          <span>确认密码：</span>

          <input type="password" name="" value="" placeholder="确认密码" class="reg_confirm">

          <span class="tip confirm_hint"></span>

      </li>

      <li>

          <span>邮箱：</span>

          <input type="text" name="" value="" placeholder="邮箱" class="reg_email">

          <span class="tip email_hint"></span>

      </li>

      <li>

          <span>手机号码：</span>

          <input type="email" name="" value="" placeholder="手机号" class="reg_mobile">

          <span class="tip mobile_hint"></span>

      </li>

      <li>

        <button type="button" name="button" class="red_button">注册</button>

      </li>

    </ul>

  </div>

书写css样式。

<style>

html, body, div, span, applet, object, iframe, h1, h2, h3, h4, h5, h6, p, blockquote, pre, a, abbr, acronym, address, big, cite, code, del, dfn, em, img, ins, kbd, q, s, samp, small, strike, strong, sub, sup, tt, var, b, u, i, center, dl, dt, dd, ol, ul, li, fieldset, form, label, legend, table, caption, tbody, tfoot, thead, tr, th, td, article, aside, canvas, details, embed, figure, figcaption, footer, header, hgroup, menu, nav, output, ruby, section, summary, time, mark, audio, video, button { margin: 0; padding: 0; border: 0; font-size: 100%; font: inherit; vertical-align: baseline; font-family: "微软雅黑"; text-decoration: none; color: #000; }

body { min-width: 1200px; }

a:hover { text-decoration: none; }

input { outline: none; }

article, aside, details, figcaption, figure, footer, header, hgroup, menu, nav, section { display: block; }

body { line-height: 1; }

ol, ul { list-style: none; }

blockquote, q { quotes: none; }

blockquote:before, blockquote:after, q:before, q:after { content: ''; content: none; }

table { border-collapse: collapse; border-spacing: 0; }

body { background-color: #333; }

.reg_div { margin: auto; width: 500px; height: 500px; border: 1px solid #333; border-radius: 5px; text-align: center; margin-top: 20px; background-color: #ffffff; }

.reg_div p { padding: 30px 0px; font-size: 30px; }

.reg_ul { width: 100%; }

.reg_ul li { margin: auto; overflow: hidden; width: 100%; margin-top: 10px; }

.reg_ul li span { float: left; width: 100px; text-align: right; display: inline-block; margin: auto; margin-left: 30px; margin-top: 10px; }

.reg_ul li span.tip { margin: 6px 0 0 10px; width: 40px; text-align: left; }

.reg_ul li input { float: left; width: 228px; height: 30px; border: 1px solid #333; border-radius: 3px; padding-left: 20px; outline: medium; margin-left: 10px; }

.reg_ul li button { margin: auto; color: #ffffff; background-color: #333; font-size: 16px; padding: 10px 60px; outline: inherit; border-radius: 3px; cursor: pointer; margin-top: 10px; }

</style>

添加并引用js。

<script type="text/javascript" src="js/jquery.min.js"></script>

<script type="text/javascript" src="js/script.js"></script>

书写script.js。

var user_Boolean = false;

var password_Boolean = false;

var varconfirm_Boolean = false;

var emaile_Boolean = false;

var Mobile_Boolean = false;

$('.reg_user').blur(function(){

  if ((/^[a-z0-9_-]{4,8}$/).test($(".reg_user").val())){

    $('.user_hint').html("✔").css("color","green");

    user_Boolean = true;

  }else {

    $('.user_hint').html("×").css("color","red");

    user_Boolean = false;

  }

});

$('.reg_password').blur(function(){

  if ((/^[a-z0-9_-]{6,16}$/).test($(".reg_password").val())){

    $('.password_hint').html("✔").css("color","green");

    password_Boolean = true;

  }else {

    $('.password_hint').html("×").css("color","red");

    password_Boolean = false;

  }

});

$('.reg_confirm').blur(function(){

  if (($(".reg_password").val())==($(".reg_confirm").val())){

    $('.confirm_hint').html("✔").css("color","green");

    varconfirm_Boolean = true;

  }else {

    $('.confirm_hint').html("×").css("color","red");

    varconfirm_Boolean = false;

  }

});

$('.reg_email').blur(function(){

  if ((/^[a-z\d]+(\.[a-z\d]+)*@([\da-z](-[\da-z])?)+(\.{1,2}[a-z]+)+$/).test($(".reg_email").val())){

    $('.email_hint').html("✔").css("color","green");

    emaile_Boolean = true;

  }else {

    $('.email_hint').html("×").css("color","red");

    emaile_Boolean = false;

  }

});

$('.reg_mobile').blur(function(){

  if ((/^1[34578]\d{9}$/).test($(".reg_mobile").val())){

    $('.mobile_hint').html("✔").css("color","green");

    Mobile_Boolean = true;

  }else {

    $('.mobile_hint').html("×").css("color","red");

    Mobile_Boolean = false;

  }

});

$('.red_button').click(function(){

  if(user_Boolean && password_Boolea && varconfirm_Boolean && emaile_Boolean && Mobile_Boolean == true){

    alert("注册成功");

  }else {

    alert("请完善信息");

  }

});

页面整体代码结构。

查看效果。