站長資訊網 var reg=/正則表達式/；
boolean reg.test(要驗證的字符串);
js引擎會將/正則表達式/“”轉換成一個RegExp對象，當字符串滿足正則表達式的要求事，返回true。
我寫的一個表達式驗證示例：功能如下：
用戶名，不能為空
密碼6為數字
密碼確認，兩次輸入密碼必須相同
身份證號碼必須是15位，或者是18位，最末尾也可以是X(該功能還沒有寫，有時間再補上)
復制代碼 代碼如下:
<!DOCTYPE html>
<html>
<head>
<title>testTablel.html</title>
<!– 用戶名，不能為空
密碼6為數字
密碼確認，兩次輸入密碼必須相同
身份證號碼必須是15位，或者是18位，最末尾也可以是X –>
<style>
#d1 {
width: 400px;
height: 250px;
background-color: #FFE4B5;
margin: 40px auto;
}
#d1_head {
color: white;
font-size: 20px;
font-family: “Arial”;
height: 24px;
background-color: bule;
}
#d1_content {
padding-left: 30px;
padding-top: 30px;
}
.s1 {
color: red;
font-style: italic;
}
.s2 {
border: 2px dotted blue;
}
</style>
<meta http-equiv=”content-type” content=”text/html; charset=UTF-8″>
<script>
function check_username(){
var txtObj=document.getElementById(“username”);
txtObj.className=”;
var msgObj=docuemnt.getElementById(“username_msg”);
msgObj.innerHTML=”;
if(txtObj.value.length==0){
msgObj.innerHTML=’用戶名不能為空’;
//給節點的class屬性賦值
txtObj.className=’s2′;
return false;
}
return true;
}
function check_pwd(){
var pwdObj=document.getElementById(“pwd”);
pwdObj.classNames=”;
var msgObj=document.getElementById(“pwd_msg”);
msgObj.innerHTML=”;
var reg=/^d{6}$/;
//javascript中一個test方法，返回boolean
if(!reg.test(pwdObj.value)){
msgObj.innerHTML=’密碼是6位數’;
pwdObj.className=’s2′;
return false;
}
return true;
}
function check_pwd1(){
var pwdObj=document.getElementById(“pwd”);
// pwdObj.classNames=”;
// var msgObj=document.getElementById(“pwd_msg”);
// msgObj.innerHTML=”;
var pwdObj1=document.getElementById(“pwd1”);
//pwdObj1.classNames=”;
var msgObj1=document.getElementById(“pwd_msg1”);
msgObj1.innerHTML=”;
if(pwdObj.value!=pwdObj1.value){
msgObj1.innerHTML=’密碼不一致，請重新輸入’;
return false;
}
return true;
}
function check_form(){
var flag=check_username()&&check_pwd()&&check_pwd1;
return flag;
}
</script>
</head>
<body>
<div id=”d1″>
<div id=”d1_head”>注冊</div>
<div id=”d1_content”>
<form onsubmit=”return check_form();”>
<table>
<tr>
<td>用戶名</td>
<td><input id=”username” name=”username”
onblur=”check_username();” /> <span class=”s1″ id=”username_msg”></span>
</td>
</tr>
<tr>
<td>密碼</td>
<td><input type=”password” id=”pwd” name=”pwd”
onblur=”check_pwd();” /> <span class=”s1″ id=”pwd_msg”></span></td>
</tr>
<tr>
<td>確認密碼</td>
<td><input type=”password” id=”pwd1″ name=”pwd1″
onblur=”check_pwd1();” /> <span class=”s1″ id=”pwd_msg1″></span>
<tr>
<td colspan=”2″>
<input type=”submit” value=”確認” /> <input type=”reset”
value=”重置” />
</td>
</tr></table>
</form>
</div>
</div>
</body>
</html>
<html>
<head>
<title>testTablel.html</title>
<!– 用戶名，不能為空
密碼6為數字
密碼確認，兩次輸入密碼必須相同
身份證號碼必須是15位，或者是18位，最末尾也可以是X –>
<style>
#d1 {
width: 400px;
height: 250px;
background-color: #FFE4B5;
margin: 40px auto;
}
#d1_head {
color: white;
font-size: 20px;
font-family: “Arial”;
height: 24px;
background-color: bule;
}
#d1_content {
padding-left: 30px;
padding-top: 30px;
}
.s1 {
color: red;
font-style: italic;
}
.s2 {
border: 2px dotted blue;
}
</style>
<meta http-equiv=”content-type” content=”text/html; charset=UTF-8″>
<script>
function check_username(){
var txtObj=document.getElementById(“username”);
txtObj.className=”;
var msgObj=docuemnt.getElementById(“username_msg”);
msgObj.innerHTML=”;
if(txtObj.value.length==0){
msgObj.innerHTML=’用戶名不能為空’;
//給節點的class屬性賦值
txtObj.className=’s2′;
return false;
}
return true;
}
function check_pwd(){
var pwdObj=document.getElementById(“pwd”);
pwdObj.classNames=”;
var msgObj=document.getElementById(“pwd_msg”);
msgObj.innerHTML=”;
var reg=/^d{6}$/;
//javascript中一個test方法，返回boolean
if(!reg.test(pwdObj.value)){
msgObj.innerHTML=’密碼是6位數’;
pwdObj.className=’s2′;
return false;
}
return true;
}
function check_pwd1(){
var pwdObj=document.getElementById(“pwd”);
// pwdObj.classNames=”;
// var msgObj=document.getElementById(“pwd_msg”);
// msgObj.innerHTML=”;
var pwdObj1=document.getElementById(“pwd1”);
//pwdObj1.classNames=”;
var msgObj1=document.getElementById(“pwd_msg1”);
msgObj1.innerHTML=”;
if(pwdObj.value!=pwdObj1.value){
msgObj1.innerHTML=’密碼不一致，請重新輸入’;
return false;
}
return true;
}
function check_form(){
var flag=check_username()&&check_pwd()&&check_pwd1;
return flag;
}
</script>
</head>
<body>
<div id=”d1″>
<div id=”d1_head”>注冊</div>
<div id=”d1_content”>
<form onsubmit=”return check_form();”>
<table>
<tr>
<td>用戶名</td>
<td><input id=”username” name=”username”
onblur=”check_username();” /> <span class=”s1″ id=”username_msg”></span>
</td>
</tr>
<tr>
<td>密碼</td>
<td><input type=”password” id=”pwd” name=”pwd”
onblur=”check_pwd();” /> <span class=”s1″ id=”pwd_msg”></span></td>
</tr>
<tr>
<td>確認密碼</td>
<td><input type=”password” id=”pwd1″ name=”pwd1″
onblur=”check_pwd1();” /> <span class=”s1″ id=”pwd_msg1″></span>
<tr>
<td colspan=”2″>
<input type=”submit” value=”確認” /> <input type=”reset”
value=”重置” />
</td>
</tr></table>
</form>
</div>
</div>
</body>
</html>
