js如何实现鼠标悬停一定时间后触发事件
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2022-05-12 19:36:16
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>闭包--自执行函数--案例--淘宝例子</title>
<style type="text/css">
.container{
width: 300px;
height: 150px;
background-color: #16A085;
}
.nav_ul{
padding: 0;
list-style: none;
height: 35px;
}
.nav_ul li{
float: left;
height: 35px;
line-height: 35px;
text-align: center;
width: 25%;
transition: all .5s;
cursor: pointer;
}
.select_li{
color: white;
border-bottom: 2px solid #FD4401;
}
.content{
width: 300px;
}
.content p ul{
padding: 0;
list-style: none;
width: 300px;
}
.content p ul li{
float: left;
width: 50%;
text-align: center;
height: 40px;
line-height: 40px;
cursor: pointer;
}
.content p{
position: absolute;
left: 0;
top: 45px;
display: none;
}
.content .select_p{
display: block;
}
</style>
</head>
<body>
<p class="container">
<p class="nav">
<ul class="nav_ul">
<li class="select_li">剧集</li>
<li>电影</li>
<li>综艺</li>
<li>动漫</li>
</ul>
</p>
<p class="content">
<p class="select_p">
<ul>
<li onclick="window.location.href='https://www.hao123.com/'">琅琊榜</li>
<li onclick="window.location.href='https://www.hao123.com/'">盲约</li>
<li onclick="window.location.href='https://www.hao123.com/'">无心法师</li>
<li onclick="window.location.href='https://www.hao123.com/'">高能医少</li>
</ul>
</p>
<p>
<ul>
<li onclick="window.location.href='https://www.hao123.com/'">加勒比</li>
<li onclick="window.location.href='https://www.hao123.com/'">绣春刀</li>
<li onclick="window.location.href='https://www.hao123.com/'">鲛珠传</li>
<li onclick="window.location.href='https://www.hao123.com/'">变形金刚</li>
</ul>
</p>
<p>
<ul>
<li onclick="window.location.href='https://www.hao123.com/'">坑王驾到</li>
<li onclick="window.location.href='https://www.hao123.com/'">快乐大本营</li>
<li onclick="window.location.href='https://www.hao123.com/'">明星大侦探</li>
<li onclick="window.location.href='https://www.hao123.com/'">爸爸去哪儿</li>
</ul>
</p>
<p>
<ul>
<li onclick="window.location.href='https://www.hao123.com/'">友人帐</li>
<li onclick="window.location.href='https://www.hao123.com/'">黑贼王</li>
<li onclick="window.location.href='https://www.hao123.com/'">你的名字</li>
<li onclick="window.location.href='https://www.hao123.com/'">柯南</li>
</ul>
</p>
</p>
</p>
<script>
var liList=document.querySelector('.nav_ul').querySelectorAll('li');
var pList=document.querySelector('.content').querySelectorAll('p');
var timer=null;
// 每一个li鼠标进入事件
for(var index=0;index<liList.length;index++){
// 自执行函数在一写完、一绑定的时候，不需要触发就执行
// 自执行函数返回function，实际上 当鼠标进入时实际上执行的是返回的函数
liList[index].onmouseenter= (function (selectIndex) {
return function () {
//增加延迟事件
timer=setTimeout(function () {
//清除所有样式 li 显示相应p中的ul 样式也去掉
for(var i=0;i<liList.length;i++){
liList[i].removeAttribute('class');
pList[i].removeAttribute('class');
}
liList[selectIndex].setAttribute('class','select_li');
pList[selectIndex].setAttribute('class','select_p');
},600);
};
}(index));
// 添加鼠标移出事件，保证离开的时候清除延迟器，不影响下一次操作
liList[index].onmouseleave = function (eve) {
clearTimeout(timer);
};
}
</script>
</body>
</html>
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