!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() { //失去焦點(diǎn)
  var namestr = $(this).val();
  var regstr = /^[\u4e00-\u9fa5]{2,4}$/;
  if(!regstr.test(namestr)) {
   $(this).parent().next().html("用戶名必須是2-4個漢字").css("color", "red");
   return false;
  }
  return true;
  }); 
  $("input[name = 'uname']").focus(function() { //獲取焦點(diǎn)
  $(this).val("");
  $(this).parent().next().html("");
  });
  $("input[name='pwd']").blur(function() {
  var pwdstr = $(this).val();
  var regstr = /^\w{6}$/;
  if(!regstr.test(pwdstr)) {
   $(this).parent().next().html("密碼必須是6位數(shù)字字母下劃線").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name='pwd']").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name='birthday']").blur(function() {
  var birthdaystr = $(this).val();
  var regstr = /^(19|20)\d{2}-(1[0-2]|0?[1-9])-(3[0-1]|2[0-9]|0?[1-9])$/;
  if(!regstr.test(birthdaystr)) {
   $(this).parent().next().html("日期格式不正確").css("color", "red");
   return false;
  }
  return true;
  });
  $("input[name='birthday']").focus(function() {
  $(this).parent().next().html("");
  });
  $("input[name='email']").blur(function(){
  var emailstr = $(this).val();
  var regstr = /^[\w\-]+@[a-z0-9A-Z]+(\.[a-zA-Z]{2,3}){1,2}$/;
  if(!regstr.test(emailstr)){
   $(this).parent().next().html("郵箱格式不正確").css("color","red");
   return false;
  }
  return true;
  });
  $("input[name='email']").focus(function(){
  $(this).parent().next().html("");
  });
 });
 /script>
 style>
 body {
  font-size: 12px;
 }
 #home {
  background-color: beige;
  border: solid 1px black;
  width: 550px;
  height: 185px;
  margin: auto;
  margin-top: 20px;
 }
 #head {
  height: 135px;
 }
 #foot {
  text-align: center;
 }
 .dl1 {
  clear: both;
  padding-left: 10px;
 }
 .dl1 dt {
  float: left;
  height: 30px;
  width: 80px;
  line-height: 30px;
 }
 .dl1 dd {
  float: left;
  height: 30px;
  line-height: 30px;
  /*width: 250px;*/
 }
 #btn_res {
  background-image: url(img/reset.gif);
  width: 80px;
  height: 34px;
 }
 #btn_sub {
  background-image: url(img/submit.gif);
  width: 80px;
  height: 34px;
 }
 /style>
 body>
 div id="home">
  div id="head">
  form action="" method="post">
   dl class="dl1">
   dt>用戶名 : /dt>
   dd class="dd1">input type="text" value="輸入用戶名" name="uname" />/dd>
   dd>/dd>
   /dl>
   dl class="dl1">
   dt>用戶密碼 : /dt>
   dd class="dd1">input type="password" name="pwd" />/dd>
   dd>/dd>
   /dl>
   dl class="dl1">
   dt>出生日期 : /dt>
   dd class="dd1">input type="text" name="birthday" />/dd>
   dd>yyyy-mm-dd/dd>
   /dl>
   dl class="dl1">
   dt>用戶郵箱 : /dt>
   dd>input type="text" name="email"/>/dd>
   dd>/dd>
   /dl>
  /form>
  /div>
  div id="foot">
  input type="submit" value="" id="btn_sub" />
  input type="reset" value="" id="btn_res" />
  /div>
 /div>
 /body>
/html>