JS一个简单的注册页面实例

如下所示：

<!DOCTYPE html>
<html>

  <head>
    <meta charset="UTF-8">
    <title></title>
  </head>
  <script src="js/jquery-1.8.0.min.js"></script>
  <script>
//    $(function(){
//      $("input[name='uname']").blur(function(){
//        var unamestr = $(this).val();
//        var regstr = /^[\u4e00-\u9fa5]{2,4}$/;//2到4位汉字
//
//      });
//    });
    function checkname(){
      var regstr = /^[\u4e00-\u9fa5]{2,4}$/; //^匹配开始 $匹配结束,2到4位汉字
      var namestr = document.regform.uname.value;
      if(!regstr.test(namestr)){
        x = document.getElementById("errorname").innerHTML="必须2-4位汉字";
//        x.style.color="green";
        return false;

      }
      x=document.getElementById("errorname").innerHTML="格式正确";
//      x.style.color="red";
      return true;
    }
    function checkpass(){
      var regstr = /^\w{6,8}$/;//  ^匹配开始 $匹配结束   \w表示数字字母下划线
      var passstr = document.regform.upass.value;
      if(!regstr.test(passstr)){
        document.getElementById("errorpwd").innerHTML="必须是6-8位数字,字母或下划线";
        return false;
      }
      document.getElementById("errorpwd").innerHTML="格式正确";
      return true;
    }
    function checkpass2(){

      var passstr = document.regform.upass.value;
      var passstr2 = document.regform.upass2.value;
//      alert("fds");
      if(passstr==passstr2){
        document.getElementById("errorpwd2").innerHTML="两次密码输入一致";
        return true;
      }

      document.getElementById("errorpwd2").innerHTML="两次密码输入不一致";
      return false;
    }
    function checkForm(){
      if(checkname()&&checkpass()&&checkpass2())
        return true;
      return false;
    }
    var citylist = new Array();
    citylist[0] = ["海淀区","朝阳区","东城区"];
    citylist[1] = ["石家庄","邢台","邯郸","保定"];
    citylist[2] = ["郑州","开封","洛阳"];
    function changecity(prov){
      //清空选项框中的选项
      document.regform.selcity.innerHTML = "";
      if(prov == "0"){
        document.regform.selcity.innerHTML = "<option value='0'>选择城市</option>";
        return;
      }
      var provindex = parseInt(prov)-1;
      var citys = citylist[provindex];
        var optionsstr = "";
        for(var i = 0; i < citys.length; i++) {
          var city = citys[i];
          optionsstr += "<option value='" + city + "'>" + city + "</option>";
        }
        document.regform.selcity.innerHTML = optionsstr;
    }

  </script>
  <style>
    body {
      font-size: 14px;
    }

    #home {
      width: 600px;
      height: 300px;
      background-color: aquamarine;
      margin: auto;/*div居中*/
      margin-top: 50px;
      padding-top: 20px;
    }

    .dl1 {
      clear: both;
    }

    .dl1 dt {
      width: 150px;
      float: left;
      height: 30px;
      line-height: 30px;
      text-align: right;
    }

    .dl1 dd {
      padding-top: 8px;
      float: left;
    }
    #div1{
      padding-top: 45px;
      width: 120px;
      margin: auto;
    }
    h1{
      text-align: center;
    }
  </style>

  <body>

    <div id="home">
      <h1>用户注册</h1>
      <form action="index.html" name="regform" method="post" onsubmit="return checkForm()">
        <dl class="dl1">
          <dt>用户姓名 : </dt>
          <dd><input type="text" name="uname" onblur="checkname()" /></dd>
          <dd id="errorname"></dd>
        </dl>
        <dl class="dl1">
          <dt>用户密码 : </dt>
          <dd><input type="password" name="upass" onblur="checkpass()"/></dd>
          <dd id="errorpwd"></dd>
        </dl>
        <dl class="dl1">
          <dt>再次输入密码 : </dt>
          <dd><input type="password" name="upass2" onblur="checkpass2()" /></dd>
          <dd id="errorpwd2"></dd>
        </dl>
        <dl class="dl1">
          <dt>用户性别 : </dt>
          <dd>
            <input type="radio" name="sex" checked="checked" />男
            <input type="radio" name="sex" />女
          </dd>
          <dd id="errorpwd"></dd>
        </dl>
        <dl class="dl1">
          <dt>用户爱好 : </dt>
          <dd>
            <input type="checkbox" />上网
            <input type="checkbox" />读书
            <input type="checkbox" />唱歌
          </dd>
        </dl>
        <dl class="dl1">
          <dt>用户籍贯 : </dt>
          <dd>
            <select name="selprov" onchange="changecity(this.value)">
              <option value="0">选择省份</option>
              <option value="1">北京</option>
              <option value="2">河北</option>
              <option value="3">河南</option>
            </select>
          </dd>
          <dd>
            <select name="selcity">
              <option value="0">选择城市</option>
            </select>
          </dd>
        </dl>
        <div id="div1">
          <input type="submit" value="提交"/>
           <input type="reset" value="重置"/>
        </div>
      </form>
    </div>
  </body>

</html>

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