案例一：电灯开关
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>电灯开关</title>
</head>
<body>
<img id="light" src="img/off.gif">
<script >
var light = document.getElementById("light");
var flag = false;
light.onclick = function() {
if(flag) {
light.src = "img/off.gif";
flag = false;
} else {
light.src = "img/on.gif";
flag = true;
}
}
</script>
</body>
</html>案例二：常见事件
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>常见事件</title>
</head>
<body>
<!--
function fun(){
return checkForm();
}
-->
<form action="#" id="form" onsubmit="return checkForm();">
<input type="text" name="username" id="username">
<select id="city" name="city">
<option>--请选择--</option>
<option>北京</option>
<option>上海</option>
<option>西安</option>
</select>
<input type="submit" value="提交">
</form>
<script>
// 2. 加载完成事件
window.onload = function () {
// 1. 失去焦点事件
/*document.getElementById("username").onblur = function () {
alert("失去焦点了~~");
}*/
// 2. 鼠标移动到元素之上
/*document.getElementById("username").onmouseover = function () {
alert("鼠标来了~~~");
alert(event.button);
}*/
// 3. 鼠标和键盘事件
/*document.getElementById("username").onkeyup = function (event) {
// alert(event.keyCode);
if(event.keyCode === 13) {
alert("提交表单，登陆成功");
}
}*/
// 4. onchange事件
/*document.getElementById("city").οnchange= function () {
alert("改变了···");
}*/
// 5. onsubmit事件
/*document.getElementById("form").οnsubmit= function () {
// 校验用户名格式
var flag = true;
return flag;
}*/
}
// 5
function checkForm() {
return false;
}
</script>
</body>
</html>案例三：表格全选
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>表格全选</title>
<style>
table{
border: 1px solid;
width: 500px;
margin-left: 30%;
}
td,th{
text-align: center;
border: 1px solid;
}
div{
margin-top: 10px;
margin-left: 30%;
}
.out{
background-color: white;
}
.over{
background-color: pink;
}
</style>
<script>
/*
分析：
1.全选：
* 获取所有的checkbox
* 遍历checkbox，设置每一个checkbox的状态为选中 checked
*/
//1.在页面加载完后绑定事件
window.onload = function(){
//2.给全选按钮绑定单击事件
document.getElementById("selectAll").onclick = function(){
//全选
//1.获取所有的checkbox
var cbs = document.getElementsByName("cb");
//2.遍历
for (var i = 0; i < cbs.length; i++) {
//3.设置每一个cb的状态为选中 checked
cbs[i].checked = true;
}
}
document.getElementById("unSelectAll").onclick = function(){
//全不选
//1.获取所有的checkbox
var cbs = document.getElementsByName("cb");
//2.遍历
for (var i = 0; i < cbs.length; i++) {
//3.设置每一个cb的状态为未选中 checked
cbs[i].checked = false;
}
}
document.getElementById("selectRev").onclick = function(){
//反选
//1.获取所有的checkbox
var cbs = document.getElementsByName("cb");
//2.遍历
for (var i = 0; i < cbs.length; i++) {
//3.设置每一个cb的状态为相反
cbs[i].checked = !cbs[i].checked;
}
}
document.getElementById("firstCb").onclick = function(){
//第一个cb点击
//1.获取所有的checkbox
var cbs = document.getElementsByName("cb");
//获取第一个cb
//2.遍历
for (var i = 0; i < cbs.length; i++) {
//3.设置每一个cb的状态和第一个cb的状态一样
cbs[i].checked = this.checked;
}
}
//给所有tr绑定鼠标移到元素之上和移出元素事件
var trs = document.getElementsByTagName("tr");
//2.遍历
for (var i = 0; i < trs.length; i++) {
//移到元素之上
trs[i].onmouseover = function(){
this.className = "over";
}
//移出元素
trs[i].onmouseout = function(){
this.className = "out";
}
}
}
</script>
</head>
<body>
<table>
<caption>学生信息表</caption>
<tr>
<th><input type="checkbox" name="cb" id="firstCb"></th>
<th>编号</th>
<th>姓名</th>
<th>性别</th>
<th>操作</th>
</tr>
<tr>
<td><input type="checkbox" name="cb" ></td>
<td>1</td>
<td>令狐冲</td>
<td>男</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
<tr>
<td><input type="checkbox" name="cb" ></td>
<td>2</td>
<td>任我行</td>
<td>男</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
<tr>
<td><input type="checkbox" name="cb" ></td>
<td>3</td>
<td>岳不群</td>
<td>?</td>
<td><a href="javascript:void(0);">删除</a></td>
</tr>
</table>
<div>
<input type="button" id="selectAll" value="全选">
<input type="button" id="unSelectAll" value="全不选">
<input type="button" id="selectRev" value="反选">
</div>
</body>
</html>案例四：表单验证
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>注册页面</title>
<style>
*{
margin: 0px;
padding: 0px;
box-sizing: border-box;
}
body{
background: url("img/register_bg.png") no-repeat center;
padding-top: 25px;
}
.rg_layout{
width: 900px;
height: 500px;
border: 8px solid #EEEEEE;
background-color: white;
/*让div水平居中*/
margin: auto;
}
.rg_left{
/*border: 1px solid red;*/
float: left;
margin: 15px;
}
.rg_left > p:first-child{
color:#FFD026;
font-size: 20px;
}
.rg_left > p:last-child{
color:#A6A6A6;
font-size: 20px;
}
.rg_center{
float: left;
/* border: 1px solid red;*/
}
.rg_right{
/*border: 1px solid red;*/
float: right;
margin: 15px;
}
.rg_right > p:first-child{
font-size: 15px;
}
.rg_right p a {
color:pink;
}
.td_left{
width: 100px;
text-align: right;
height: 45px;
}
.td_right{
padding-left: 50px ;
}
#username,#password,#email,#name,#tel,#birthday,#checkcode{
width: 251px;
height: 32px;
border: 1px solid #A6A6A6 ;
/*设置边框圆角*/
border-radius: 5px;
padding-left: 10px;
}
#checkcode{
width: 110px;
}
#img_check{
height: 32px;
vertical-align: middle;
}
#btn_sub{
width: 150px;
height: 40px;
background-color: #FFD026;
border: 1px solid #FFD026 ;
}
.error{
color:red;
}
#td_sub{
padding-left: 150px;
}
</style>
<script>
/*
分析：
1.给表单绑定onsubmit事件。监听器中判断每一个方法校验的结果。
如果都为true，则监听器方法返回true
如果有一个为false，则监听器方法返回false
2.定义一些方法分别校验各个表单项。
3.给各个表单项绑定onblur事件。
*/
window.onload = function(){
//1.给表单绑定onsubmit事件
document.getElementById("form").onsubmit = function(){
//调用用户校验方法 chekUsername();
//调用密码校验方法 chekPassword();
//return checkUsername() && checkPassword();
return checkUsername() && checkPassword() && checkEmail();
}
//给用户名和密码框分别绑定离焦事件
document.getElementById("username").onblur = checkUsername;
document.getElementById("password").onblur = checkPassword;
document.getElementById("email").onblur = checkEmail;
}
//校验用户名
function checkUsername(){
//1.获取用户名的值
var username = document.getElementById("username").value;
//2.定义正则表达式
var reg_username = /^\w{6,12}$/;
//3.判断值是否符合正则的规则
var flag = reg_username.test(username);
//4.提示信息
var s_username = document.getElementById("s_username");
if(flag){
//提示绿色对勾
s_username.innerHTML = "<img width='35' height='25' src='img/gou.png'/>";
}else{
//提示红色用户名有误
s_username.innerHTML = "用户名格式有误";
}
return flag;
}
//校验密码
function checkPassword(){
//1.获取用户名的值
var password = document.getElementById("password").value;
//2.定义正则表达式
var reg_password = /^\w{6,12}$/;
//3.判断值是否符合正则的规则
var flag = reg_password.test(password);
//4.提示信息
var s_password = document.getElementById("s_password");
if(flag){
//提示绿色对勾
s_password.innerHTML = "<img width='35' height='25' src='img/gou.png'/>";
}else{
//提示红色用户名有误
s_password.innerHTML = "密码格式有误";
}
return flag;
}
//校验邮箱
function checkEmail(){
//1.获取用户名的值
var email = document.getElementById("email").value;
//2.定义正则表达式
var reg_email = /^\w{6,12}$/;
//3.判断值是否符合正则的规则
var flag = reg_email.test(email);
//4.提示信息
var s_email = document.getElementById("s_email");
// alert(s_email);
if(flag){
//提示绿色对勾
s_email.innerHTML = "<img width='35' height='25' src='img/gou.png'/>";
}else{
//提示红色邮箱有误
s_email.innerHTML = "邮箱格式有误";
}
return flag;
}
</script>
</head>
<body>
<div class="rg_layout">
<div class="rg_left">
<p>新用户注册</p>
<p>USER REGISTER</p>
</div>
<div class="rg_center">
<div class="rg_form">
<!--定义表单 form-->
<form action="#" id="form" method="get">
<table>
<tr>
<td class="td_left"><label for="username">用户名</label></td>
<td class="td_right">
<input type="text" name="username" id="username" placeholder="请输入用户名">
<span id="s_username" class="error"></span>
</td>
</tr>
<tr>
<td class="td_left"><label for="password">密码</label></td>
<td class="td_right">
<input type="password" name="password" id="password" placeholder="请输入密码">
<span id="s_password" class="error"></span>
</td>
</tr>
<tr>
<td class="td_left"><label for="email">Email</label></td>
<td class="td_right">
<input type="email" name="email" id="email" placeholder="请输入邮箱">
<span id="s_email" class="error"></span>
</td>
</tr>
<tr>
<td class="td_left"><label for="name">姓名</label></td>
<td class="td_right"><input type="text" name="name" id="name" placeholder="请输入姓名"></td>
</tr>
<tr>
<td class="td_left"><label for="tel">手机号</label></td>
<td class="td_right"><input type="text" name="tel" id="tel" placeholder="请输入手机号"></td>
</tr>
<tr>
<td class="td_left"><label>性别</label></td>
<td class="td_right">
<input type="radio" name="gender" value="male" checked> 男
<input type="radio" name="gender" value="female"> 女
</td>
</tr>
<tr>
<td class="td_left"><label for="birthday">出生日期</label></td>
<td class="td_right"><input type="date" name="birthday" id="birthday" placeholder="请输入出生日期"></td>
</tr>
<tr>
<td class="td_left"><label for="checkcode" >验证码</label></td>
<td class="td_right"><input type="text" name="checkcode" id="checkcode" placeholder="请输入验证码">
<img id="img_check" src="img/verify_code.jpg">
</td>
</tr>
<tr>
<td colspan="2" id="td_sub"><input type="submit" id="btn_sub" value="注册"></td>
</tr>
</table>
</form>
</div>
</div>
<div class="rg_right">
<p>已有账号?<a href="#">立即登录</a></p>
</div>
</div>
</body>
</html>
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