前端基础系列（七）JQuery基础（上篇）
一、使用JQ弹出广告
（1）JQ入门：
<html>
<head>
<meta charset="UTF-8">
<title>jquery入门title>
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
$(function(){
alert("hello jquery!");
});
script>
head>
<body>
body>
html>运行结果：
（2）JS与JQ页面加载区别：
<html>
<head>
<meta charset="UTF-8">
<title>JS与JQ页面加载区别title>
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
window.onload = function(){
alert("张三");
}
//传统的方式页面加载会存在覆盖问题，加载比JQ慢(整个页面加载完毕<包括里面的其它内容，比如图片>)
window.onload = function(){
alert("老王");
}
//JQ的加载比JS加载要快！(当整个dom树结构绘制完毕就会加载)
jQuery(document).ready(function(){
alert("李四");
});
//JQ不存在覆盖问题，加载的时候是顺序执行
$(document).ready(function(){
alert("王五");
});
//简写方式
$(function(){
alert("汾九");
});
script>
head>
<body>
body>
html>运行结果依次显示：李四 王五 汾九 老王
（3）JQ获取：
<html>
<head>
<meta charset="UTF-8">
<title>JQ的获取title>
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
$(function(){
//1.JS方式获取
/*document.getElementById("btn").οnclick= function(){
location.href="惊喜.html";
}*/
//2.JQ方式获取=====>>>$("#btn")
$("#btn").click(function(){
location.href="惊喜.html"
});
});
script>
head>
<body>
<input type="button" value="点我有惊喜" id="btn"/>
body>
html>（4）DOM和JQ对象的转换：
<html>
<head>
<meta charset="UTF-8">
<title>Dom与JQ对象之间的转换title>
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
function write1(){
//1.JS的DOM操作
//document.getElementById("span1").innerHTML="萌萌哒！";
//DOM对象无法操作JQ对象里面属性和方法
//document.getElementById("span1").html("萌萌哒！");
var spanEle = document.getElementById("span1");
//将DOM对象转换成JQ对象
$(spanEle).html("思密达");
}
$(function(){
$("#btn").click(function(){
//JQ对象无法操作JS里面的属性和方法！！！
//$("#span1").innerHTML="呵呵哒！"
$("#span1").html("呵呵哒！");
//JQ对象向DOM对象转换方式一
$("#span1").get(0).innerHTML="美美哒！";
//JQ对象向DOM对象转换方式二
$("#span1")[0].innerHTML="棒棒哒！";
});
});
script>
head>
<body>
<input type="button" value="JS写入" onclick="write1()"/>
<input type="button" value="JQ写入" id="btn"/><br />
班长：<span id="span1">你好帅！span>
body>
html>运行结果：
点击JS写入，显示班长斯密达；点击JQ写入，显示班长棒棒哒
（5）toggle使用：
<html>
<head>
<meta charset="UTF-8">
<title>toggle的使用title>
<style>
div{
border: 1px solid white;
width: 500px;
height: 350px;
margin: auto;
text-align: center;
}
style>
<script type="text/javascript" src="../js/jquery-1.8.3.js" >script>
<script>
$(function(){
$("#btn").click(function(){
$("#img1").toggle();
});
});
script>
head>
<body>
<div>
<input type="button" value="显示/隐藏" id="btn" /><br />|
<img src="../img/飞机05.gif" width="100%" height="100%" id="img1"/>
div>
body>
html>运行结果：点击按钮之后图片隐藏，再次点击的时候图片显示
（6）首页广告显示：
<html>
<head>
<meta charset="UTF-8">
<title>首页title>
<style>
#father{
border: 0px solid red;
width: 1300px;
height: 2170px;
margin: auto;
}
/*#logo{
border: 0px solid black;
width: 1300px;
height: 50px;
}*/
.top{
border: 0px solid blue;
width: 431px;
height: 50px;
float: left;
}
#top{
padding-top: 12px;
height: 38px;
}
#menu{
border: 0px solid red;
width: 1300px;
height: 50px;
background-color: black;
margin-bottom: 10px;
}
ul li{
display: inline;
color: white;
}
#clear{
clear: both;
}
#product{
border: 0px solid red;
width: 1300px;
height: 558px;
}
#product_top{
border: 0px solid blue;
width: 100%;
height: 45px;
padding-top: 8px;
}
#product_bottom{
border: 0px solid green;
width: 100%;
height: 500px;
}
#product_bottom_left{
border: 0px solid red;
width: 200px;
height: 500px;
float: left;
}
#product_bottom_right{
border: 0px solid blue;
width: 1094px;
height: 500px;
float: left;
}
#big{
border: 0px solid red;
width: 544px;
height: 248px;
float: left;
}
.small{
border: 0px solid blue;
width: 180px;
height: 248px;
float: left;
/*让里面的内容居中*/
text-align: center;
}
#bottom{
text-align: center;
}
a{
text-decoration: none;
}
style>
<script type="text/javascript" src="../js/jquery-1.8.3.js" >script>
<script>
$(function(){
//1.书写显示广告图片的定时操作
time = setInterval("showAd()",3000);
});
//2.书写显示广告图片的函数
function showAd(){
//3.获取广告图片，并让其显示
//$("#img2").show(1000);
//$("#img2").slideDown(5000);
$("#img2").fadeIn(4000);
//4.清除显示图片定时操作
clearInterval(time);
//5.设置隐藏图片的定时操作
time = setInterval("hiddenAd()",3000);
}
function hiddenAd(){
//6.获取广告图片，并让其隐藏
//$("#img2").hide();
//$("#img2").slideUp(5000);
$("#img2").fadeOut(6000);
//7.清除隐藏图片的定时操作
clearInterval(time);
}
script>
head>
<body onload="init()">
<div id="father">
<img src="../img/f001a62f-a49d-4a4d-b56f-2b6908a0002c_g.jpg" width="100%" style="display: none" id="img2"/>
<div id="logo">
<div class="top">
<img src="../img/logo2.png" height="46px"/>
div>
<div class="top">
<img src="../img/header.png" height="46px" />
div>
<div class="top" id="top">
<a href="#">登录a>
<a href="#">注册a>
<a href="#">购物车a>
div>
div>
<div id="clear">
div>
<div id="menu">
<ul>
<a href="#"><li style="font-size: 20px;">首页li>a>
<a href="#"><li>手机数码li>a>
<a href="#"><li>家用电器li>a>
<a href="#"><li>鞋靴箱包li>a>
<a href="#"><li>孕婴保健li>a>
<a href="#"><li>奢侈品li>a>
ul>
div>
<div id="">
<img src="../img/1.jpg" width="100%" id="img1"/>
div>
<div id="product">
<div id="product_top">
<span style="font-size: 25px;padding-top: 8px;">最新商品span>
<img src="../img/title2.jpg" />
div>
<div id="product_bottom">
<div id="product_bottom_left">
<img src="../img/big01.jpg" width="100%" height="100%"/>
div>
<div id="product_bottom_right">
<div id="big">
<a href="#"><img src="../img/middle01.jpg" width="100%" height="100%"/>a>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
div>
div>
div>
<div id="">
<img src="../img/ad.jpg" width="100%" />
div>
<div id="product">
<div id="product_top">
<span style="font-size: 25px;padding-top: 8px;">热门商品span>
<img src="../img/title2.jpg" />
div>
<div id="product_bottom">
<div id="product_bottom_left">
<img src="../img/big01.jpg" width="100%" height="100%"/>
div>
<div id="product_bottom_right">
<div id="big">
<a href="#"><img src="../img/middle01.jpg" width="100%" height="100%"/>a>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
<div class="small">
<img src="../img/small03.jpg" />
<a href="#"><p style="color: gray;">电炖锅p>a>
<p style="color: red;">¥399p>
div>
div>
div>
div>
<div id="">
<img src="../img/footer.jpg" width="100%"/>
div>
<div id="bottom">
<a href="#">关于我们a>
<a href="#">联系我们a>
<a href="#">招贤纳士a>
<a href="#">法律声明a>
<a href="#">友情链接a>
<a href="#">支付方式a>
<a href="#">配送方式a>
<a href="#">服务声明a>
<a href="#">广告声明a>
<p>
Copyright © 2005-2018 火之意志 版权所有
p>
div>
div>
body>
html>二、JQ选择器
（1）基本选择器：
<html>
<head>
<meta charset="UTF-8">
<title>基本选择器title>
<link rel="stylesheet" href="../../css/style.css" />
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
$(function(){
$("#btn1").click(function(){
$("#one").css("background-color","pink");
});
$("#btn2").click(function(){
$(".mini").css("background-color","pink");
});
$("#btn3").click(function(){
$("div").css("background-color","pink");
});
$("#btn4").click(function(){
$("*").css("background-color","pink");
});
$("#btn5").click(function(){
$("#two,.mini").css("background-color","pink");
});
});
script>
head>
<body>
<input type="button" id="btn1" value="选择为one的元素"/>
<input type="button" id="btn2" value="选择样式为mini的元素"/>
<input type="button" id="btn3" value="选择所有的div元素"/>
<input type="button" id="btn4" value="选择所有元素"/>
<input type="button" id="btn5" value="选择id为two并且样式为mini的元素"/>
<hr/>
<div id="one">
<div class="mini">
111
div>
div>
<div id="two">
<div class="mini">
222
div>
<div class="mini">
333
div>
div>
<div id="three">
<div class="mini">
444
div>
<div class="mini">
555
div>
<div class="mini">
666
div>
div>
<span id="four">
span>
body>
html>（2）层级选择器：
<html>
<head>
<meta charset="UTF-8">
<title>层级选择器title>
<link rel="stylesheet" type="text/css" href="../../css/style.css"/>
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script type="text/javascript">
$(function(){
$("#btn1").click(function(){
$("body div").css("background-color","gold");
});
$("#btn2").click(function(){
$("body>div").css("background-color","gold");
});
$("#btn3").click(function(){
$("#two+div").css("background-color","gold");
});
$("#btn4").click(function(){
$("#one~div").css("background-color","gold");
});
});
script>
head>
<body>
<input type="button" id="btn1" value="选择body中的所有的div元素"/>
<input type="button" id="btn2" value="选择body中的第一级的孩子"/>
<input type="button" id="btn3" value="选择id为two的元素的下一个元素"/>
<input type="button" id="btn4" value="选择id为one的所有的兄弟元素"/>
<hr/>
<div id="one">
<div class="mini">
111
div>
div>
<div id="two">
<div class="mini">
222
div>
<div class="mini">
333
div>
div>
<div id="three">
<div class="mini">
444
div>
<div class="mini">
555
div>
<div class="mini">
666
div>
div>
<span id="four">
span>
body>
html>（3）属性选择器：
<html>
<head>
<meta charset="UTF-8">
<title>层级选择器title>
<link rel="stylesheet" href="../../css/style.css" />
<script type="text/javascript" src="../../js/jquery-1.8.3.js" >script>
<script>
$(function(){
$("#btn1").click(function(){
$("div[id]").css("background-color","red");
});
$("#btn2").click(function(){
$("div[id='two']").css("background-color","red");
});
});
script>
head>
<body>
<input type="button" id="btn1" value="选择有id属性的div"/>
<input type="button" id="btn2" value="选择有id属性的值为two的div"/>
<hr/>
<div id="one">
<div class="mini">
111
div>
div>
<div id="two">
<div class="mini">
222
div>
<div class="mini">
333
div>
div>
<div id="three">
<div class="mini">
444
div>
<div class="mini">
555
div>
<div class="mini">
666
div>
div>
<span id="four">
span>
body>
html>
三、使用JQ弹隔行换色
<html>
<head>
<meta charset="UTF-8">
<title>使用jQuery完成表格隔行换色title>
<link rel="stylesheet" href="../css/style.css" />
<script type="text/javascript" src="../js/jquery-1.8.3.js" >script>
<script>
//1.页面加载
$(function(){
/*//2.获取tbody下面的偶数行并设置背景颜色
$("tbody tr:even").css("background-color","yellow");
//3.获取tbody下面的奇数行并设置背景颜色
$("tbody tr:odd").css("background-color","green");*/
//2.获取tbody下面的偶数行并设置背景颜色
$("tbody tr:even").addClass("even");
$("tbody tr:even").removeClass("even");
//3.获取tbody下面的奇数行并设置背景颜色
$("tbody tr:odd").addClass("odd");
});
script>
head>
<body>
<table border="1" width="500" height="50" align="center" id="tbl" id="tbl">
<thead>
<tr>
<th>编号th>
<th>姓名th>
<th>年龄th>
tr>
thead>
<tbody>
<tr >
<td>1td>
<td>张三td>
<td>22td>
tr>
<tr >
<td>2td>
<td>李四td>
<td>25td>
tr>
<tr >
<td>3td>
<td>王五td>
<td>27td>
tr>
<tr >
<td>4td>
<td>赵六td>
<td>29td>
tr>
<tr >
<td>5td>
<td>田七td>
<td>30td>
tr>
<tr >
<td>6td>
<td>汾九td>
<td>20td>
tr>
tbody>
table>
body>
html>运行结果：
四、使用JQ全选/全部选
<html>
<head>
<meta charset="UTF-8">
<title>使用jQuery完成复选框的全选和全不选title>
<script type="text/javascript" src="../js/jquery-1.8.3.js" >script>
<script>
$(function(){
$("#select").click(function(){
//获取下面所有的 复选框并将其选中状态设置跟编码的前端 复选框保持一致。
//attr方法与JQ的版本有关，在1.8.3及以下有效。
//$("tbody input").attr("checked",this.checked);
$("tbody input").prop("checked",this.checked);
});
});
script>
head>
<body>
<table border="1" width="500" height="50" align="center" id="tbl" >
<thead>
<tr>
<td colspan="4">
<input type="button" value="添加" />
<input type="button" value="删除" />
td>
tr>
<tr>
<th><input type="checkbox" id="select">th>
<th>编号th>
<th>姓名th>
<th>年龄th>
tr>
thead>
<tbody>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>1td>
<td>张三td>
<td>22td>
tr>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>2td>
<td>李四td>
<td>25td>
tr>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>3td>
<td>王五td>
<td>27td>
tr>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>4td>
<td>赵六td>
<td>29td>
tr>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>5td>
<td>田七td>
<td>30td>
tr>
<tr >
<td><input type="checkbox" class="selectOne"/>td>
<td>6td>
<td>汾九td>
<td>20td>
tr>
tbody>
table>
body>
html>运行结果：
