用JS和JQuery實現的效果是一樣的。

HTML代碼

<legend> 請填寫注冊信息</legend>  <form action="index.html" method="post">    <table style="text-align: right;">      <tr>        <td>用戶名：</td>        <td><input type="text" name="userName" placeholder="由英文字母和數字組成的4-16位字符，以字母開頭">        </td>      </tr>      <tr>        <td>昵稱：</td>        <td><input type="text" name="nickName" placeholder="由2-6個漢字組成">        </td>      </tr>      <tr>        <td>郵箱：</td>        <td><input type="text" name="email" placeholder="郵箱賬號@域名。如good@tom.com、whj@sina.com.cn">        </td>      </tr>      <tr>        <td>密碼：</td>        <td><input type="password" name="pwd" placeholder="由英文字母和數字組成的4-10位字符">        </td>      </tr>      <tr>        <td>確認密碼：</td>        <td><input type="password" name="pwd2" placeholder="確認密碼">        </td>      </tr>      <tr>        <td>手機號碼：</td>        <td><input type="text" name="phone" placeholder="手機號由11位數字組成，且以13,15,18開頭">        </td>      </tr>      <tr>        <td>出生日期：</td>        <td><input type="text" name="date" placeholder="出生日期在1990-2009之間">      </tr>      <tr>        <td colspan="2" align="left"><input type="button" name="submit" value="提交"></td>      </tr>    </table>  </form></fieldset>

CSS樣式

 body {      text-align: center;      padding: 0;      margin: 0;    }    fieldset {      width: 800px;    }    table tr td ~ td {      text-align: left;      width: 600px;    }

JS代碼

//驗證用戶名function check_userName() {  var userName = document.getElementById("name").value;  var regName = /[a-zA-Z]/w{4,16}/  if (userName == "" || userName.trim() == "") {    document.getElementById("err_name").innerHTML = "請輸入用戶名";    return false;  } else if (!regName.test(userName)) {    document.getElementById("err_name").innerHTML = "由英文字母和數字組成的4-16位字符，以字母開頭";    return false;  } else {    document.getElementById("err_name").innerHTML = "ok!!!";    return true;  }}//驗證昵稱function check_nickName() {  var nickName = document.getElementById("nick").value;  var regName = /[/u4e00-/u9fa5]{2,6}/  if (nickName == "" || nickName.trim() == "") {    document.getElementById("err_nick").innerHTML = "請輸入昵稱";    return false;  } else if (!regName.test(nickName)) {    document.getElementById("err_nick").innerHTML = "由2-6個漢字組成";    return false;  } else {    document.getElementById("err_nick").innerHTML = "ok!!!";    return true;  }}//驗證郵箱function check_email() {  var email = document.getElementById("email").value;  var regEmail = /^/w+@/w+((/./w+)+)$/;  if (email == "" || email.trim() == "") {    document.getElementById("err_email").innerHTML = "請輸入郵箱";    return false;  } else if (!regEmail.test(email)) {    document.getElementById("err_email").innerHTML = "郵箱賬號@域名。如good@tom.com、whj@sina.com.cn";    return false;  } else {    document.getElementById("err_email").innerHTML = "ok!!!";    return true;  }}//驗證密碼function check_pwd() {  var pwd = document.getElementById("pwd").value;  var regPwd = /^/w{4,10}$/;  if (pwd == "" || pwd.trim() == "") {    document.getElementById("err_pwd").innerHTML = "請輸入密碼";    return false;  } else if (!regPwd.test(pwd)) {    document.getElementById("err_pwd").innerHTML = "格式錯誤";    return false;  } else {    document.getElementById("err_pwd").innerHTML = "ok!!!";    return true;  }}//確認密碼function check_pwd2() {  var pwd = document.getElementById("pwd").value;  var pwd2 = document.getElementById("pwd2").value;  if (pwd2 == "" || pwd2.trim() == "") {    document.getElementById("err_pwd2").innerHTML = "請輸入密碼";    return false;  } else if (!pwd2.equals(pwd)) {    document.getElementById("err_pwd2").innerHTML = "兩次輸入密碼不一致";    return false;  } else {    document.getElementById("err_pwd2").innerHTML = "ok!!!";    return true;  }}//驗證手機號function check_phone() {  var phone = document.getElementById("phone").value;  var regPhone = /[13,15,18]/d{9}/;  if (phone == "" || phone.trim() == "") {    document.getElementById("err_phone").innerHTML = "請輸入手機號";    return false;  } else if (!regPhone.test(phone)) {    document.getElementById("err_phone").innerHTML = "手機號由11位數字組成，且以13,15,18開頭";    return false;  } else {    document.getElementById("err_phone").innerHTML = "ok!!!";    return true;  }}//驗證時間function check_date() {  var birthday = document.getElementById("birthday").value;  var regDate = /[13,15,18]/d{9}/;  if (birthday == "" || birthday.trim() == "") {    document.getElementById("err_date").innerHTML = "請輸入日期";    return false;  } else if (!regDate.test(birthday)) {    document.getElementById("err_date").innerHTML = "出生日期在1990-2009之間";    return false;  } else {    document.getElementById("err_date").innerHTML = "ok!!!";    return true;  }}