JS 操作对象事件样式

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1、获取标记对象

css 1 - class 2 - id 3 - 标记选择器

js 1 - class 2 - id 3 - 标记 4 - name

+ document.getElementById('id')； - 获取一个对象
+ document.getElementsByClassName('class'); - 获取的是一个数组

+ document.getElementsByTagName('标记'); - 获取的也是一个数组

<input type="button" name="ccc"/> 这里的name是给服务器发送的
+ document.getElementsByName('name'); - 获取的也是一个数组

2、掌握三个事件

+ onclick - 点击事件
+ onmouseover - 鼠标移入事件
+ onmouseout - 鼠标移出事件

3、控制标记的样式
标记对象.style.样式 = "值";
样式里带 “-” 要删掉，后面的第一个字母变为大写

放在等号右边是取值，可以看到元素内联样式的值

js里，对象的index属性，可以记录一个int类型的值

例如：移入div 变大移出的时候便会原位

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title></title>
<style type="text/css">
#aaa {width:100px;
height:100px;
background-color:red;
}
</style>
</head>
<body>
<div id="aaa"></div> </body>
</html>
<script type="text/javascript">
var a = document.getElementById('aaa');
//移入变大
a.onmouseover = function () {
a.style.width = "200px";
a.style.height = "200px";
}
//移除回到原位
a.onmouseout = function () {
a.style.width = "100px";
a.style.height = "100px";
}
</script>

移入的时候变成蓝色移出的时变成原来的颜色

导航栏变色

有导航条

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
.aaa {
width: 100px;
height: 100px;
background-color: red;
float: left;
margin-right: 10px;
} .div2 {
width: 100px;
height: 600px;
background-color: green;
display: none;
float:left;
margin-right:10px;
margin-top:110px;
}
</style>
</head>
<body>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
</body>
</html>
<script type="text/javascript">
var a = document.getElementsByClassName('aaa');
var b = document.getElementsByClassName('div2');
for (var i = ; i < a.length; i++) {
//索引
a[i].index = i;
//移入的时候变为蓝色
a[i].onmouseover = function () {
this.style.backgroundColor = "blue";//这里的this代表移入哪个div 代表的哪个div
//就是a[i] 不过i在function函数里面不是那个索引了是长度了所以用this
b[this.index].style.display = "block";
}
//移出的时候变为红色
a[i].onmouseout = function () {
this.style.backgroundColor = "red";//同上
b[this.index].style.display = "none";
}
}
</script>

上面几个是移入移出的这里在加上点击事件

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
.aaa {
width: 100px;
height: 100px;
background-color: red;
float: left;
margin-right: 10px;
} .div2 {
width: 100px;
height: 600px;
background-color: green;
display: none;
float:left;
margin-right:10px;
margin-top:110px;
}
</style>
</head>
<body>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
<div class="aaa">
<div class="div2"></div>
</div>
</body>
</html>
<script type="text/javascript">
var a = document.getElementsByClassName('aaa');
var b = document.getElementsByClassName('div2');
for (var i = ; i < a.length; i++) {
//索引
a[i].index = i;
//点击的时候变为黑色导航条显示
a[i].onclick = function () {
//每个导航都变为原来的颜色导航条隐藏
for(var j=;j<a.length;j++)
{a[j].style.backgroundColor="red";
b[j].style.display="none";
}
this.style.backgroundColor = "black";
b[this.index].style.display = "block";
}
//移入的时候变为蓝色
a[i].onmouseover = function () {
if(this.style.backgroundColor!="red")
this.style.backgroundColor = "blue";
}
//移出的时候变为红色导航条隐藏
a[i].onmouseout = function () {
if(this.style.backgroundColor!="balck")
{ this.style.backgroundColor = "red";}
}
}
</script>

选项卡

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<style type="text/css">
.aaa {
width: 100px;
height: 30px;
background-color: red;
float: left;
margin-right: 10px;
} .div2 {
position: absolute;
width: 540px;
height: 330px;
margin-top:33px;
background-color: green;
z-index=
}
</style>
</head>
<body>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>
<div class="aaa"></div>

<div class="div2"></div>
<div class="div2"></div>
<div class="div2"></div>
<div class="div2"></div>
<div class="div2"></div> </body>
</html>
<script type="text/javascript">
var a = document.getElementsByClassName('aaa');
var b = document.getElementsByClassName('div2');
var zend = ;
for (var i = ; i < a.length; i++) {
//索引
a[i].index = i;
//点击打开哪一个导航就打开那一页选项卡
a[i].onclick = function () {
for (var j = ; j < a.length; j++) {
a[j].style.backgroundColor = "red";
}
this.style.backgroundColor = "black";
b[this.index].style.zIndex = zend;
zend++;
}
//移入颜色变为蓝色
a[i].onmouseover = function () {
if (this.style.backgroundColor != "black")
this.style.backgroundColor = "blue";
}
//移出颜色变为原来的颜色红色
a[i].onmouseout = function () {
if (this.style.backgroundColor == "blue")
this.style.backgroundColor = "red";
}
}
</script>

非自动的大图轮播

<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<link href="StyleSheet.css" rel="stylesheet" />
</head>
<body>

<div class="all">
<img class="imga" src="1L.jpg" style="display: block;" />
<img class="imga" src="2.jpg" />
<img class="imga" src="3.jpg" />
<img class="imga" src="4.jpg" />
<img class="imga" src="5.jpg" />
<div id="left"><</div>
<div id="right">></div>
</div>
</body>
</html>
<script type="text/javascript">
var left = document.getElementById("left");
var right = document.getElementById("right");
var count = ;
var tu = document.getElementsByClassName('imga');
//点击右边
right.onclick = function () {
for (var i = ; i < tu.length; i++) {
tu[i].style.display = "none";
}
count++;
if (count > (tu.length - ))
count = ;
tu[count].style.display = "block";
}
//点击左边
left.onclick = function () {
for (var i = ; i < tu.length; i++) {
tu[i].style.display = "none";
}
count--;
if (count < )
count = tu.length - ;
tu[count].style.display = "block";
}
</script>

css的

.all {
position: relative;
margin-top: 30px;
margin-left: %;
width: %;
height: 500px;
background-color: blue;
} .imga{
position: absolute;
width: %;
height: %;
display:none;
} #left {
position: absolute;
left: 10px;
top: 200px;
width: 30px;
height: 100px;
z-index: ;
cursor: pointer;
color: white;
font-size: 60px;
line-height:100px;
background-color: black;
} #right {
position: absolute;
right: 10px;
top: 200px;
width: 30px;
height: 100px;
z-index: ;
cursor: pointer;
color: white;
font-size: 60px;
line-height:100px;
background-color: black;
}

用函数简化点

head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<link href="StyleSheet.css" rel="stylesheet" />
</head>
<body>

<div class="all">
<img class="imga" src="1L.jpg" style="display: block;" />
<img class="imga" src="2.jpg" />
<img class="imga" src="3.jpg" />
<img class="imga" src="4.jpg" />
<img class="imga" src="5.jpg" />
<div id="left"><</div>
<div id="right">></div>
</div>
</body>
</html>
<script type="text/javascript">
var left = document.getElementById("left");
var right = document.getElementById("right");
var count = ;
var tu = document.getElementsByClassName('imga');
//点击右边
right.onclick = function ()
{
move();
}
//点击左边
left.onclick = function () {
move();
} function move(a) {
for (var i = ; i < tu.length; i++) {
tu[i].style.display = "none";
}
//如果向左移那么给a=0
if (a == ) {
count--;
if (count < )
count = tu.length - ;
tu[count].style.display = "block";
}
//否则向右移动
else
{
count++;
if (count > (tu.length - ))
count = ;
tu[count].style.display = "block";
} }
</script>