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<meta name="author" content="郭菊锋,702004176@qq.com" />
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<title>可伸缩的导航菜单</title>
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* {
margin: 0;
padding: 0;
font-size: 14px;
}
a {
color: #333;
text-decoration: none
}
ul {
list-style: none;
height: 30px;
border-bottom: 5px solid #F60;
margin-top: 20px;
padding-left: 50px;
}
ul li {
float: left
}
ul li a {
display: block;
height: 30px;
text-align: center;
line-height: 30px;
width: 120px;
background: #efefef;
margin-left: 1px;
}
a.on,
a:hover {
background: #F60;
color: #fff;
}
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<script>
window.onload = function() {
var aA = document.getElementsByTagName('a');
for(var i = 0; i < aA.length; i++) {
aA[i].onmouseover = function() {
var This = this;
clearInterval(This.time);//一开始要清楚定时器!!删了一下试试还是可以的呀。
This.time = setInterval(function() {
This.style.width = This.offsetWidth + 8 + "px";
if(This.offsetWidth >= 160)//这里,只有一行代码,所以不加花括号也是可以的。
clearInterval(This.time);
}, 30)
}
aA[i].onmouseout = function() {//和over时的效果一样,就是缩回来罢了
clearInterval(this.time);
var This = this;
this.time = setInterval(function() {
This.style.width = This.offsetWidth - 8 + "px";
if(This.offsetWidth <= 120) {//offsetWidth还有这个妙用,这的是元素的实际宽度吗?
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<!--调用jq-->
<!--<script>
// jq的制作方法
$(function() { //$()==js里面的:window.onload = function(){};让页面加载完成之后再进行调用函数。
$('a').hover(
//$('x')选择器,选择标签是x的,括号里的引号里添加的是标签名
//hover方法,表示鼠标经过的时候的效果
//下设两个函数,一个鼠标移入动作,一个鼠标移出动作。
function() {
$(this).stop().animate({
"width": "160px"
}, 200); //jq自带的animate动画效果
},
function() {
$(this).stop().animate({
"width": "120px"
}, 200);
}
)
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<p>来自慕课网教程
<a>http://www.imooc.com/video/93</a>
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1 <script> 2 window.onload = function() { 3 var aA = document.getElementsByTagName('a'); 4 for(var i = 0; i < aA.length; i++) { 5 aA[i].onmouseover = function() { 6 var This = this; 7 clearInterval(This.time); 8 This.time = setInterval(function() { 9 This.style.width = This.offsetWidth + 8 + "px"; 10 if(This.offsetWidth >= 160) 11 clearInterval(This.time); 12 }, 30) 13 } 14 aA[i].onmouseout = function() { 15 clearInterval(this.time); 16 var This = this; 17 this.time = setInterval(function() { 18 This.style.width = This.offsetWidth - 8 + "px"; 19 if(This.offsetWidth <= 120) { 20 This.style.width = '120px'; 21 clearInterval(This.time); 22 } 23 }, 30) 24 } 25 } 26 } 27 </script>
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