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bannerPractice.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>练习4</title>
<style>
* {
margin: 0;
padding: 0;
}
#con {
position: relative;
width: 50%;
height: 200px;
margin: 0 auto;
margin-top: 50px;
overflow: hidden;
}
ul {
position: absolute;
display: flex;
left: 0px;
width: 100%; /*不加100%会出现放大现象*/
height: 100%;
}
li {
list-style: none;
width: 18%;
height: 100%;
margin-left: 2%;
flex-shrink: 0; /*缩放设置为0 不缩放*/
}
img {
width: 100%;
height: 100%;
}
</style>
</head>
<body>
<div id="con">
<ul id="ul">
<li><img src="../../../img/cat.jpg" alt=""></li>
<li><img src="../../../img/duo1.png" alt=""></li>
<li><img src="../../../img/duo2.png" alt=""></li>
<li><img src="../../../img/duo3.png" alt=""></li>
<li><img src="../../../img/duo4.png" alt=""></li>
</ul>
</div>
</body>
<script>
var ul = document.getElementById("ul");
/* console.log("ul1: " + window.getComputedStyle(ul).width);*/
var con = document.getElementById("con");
/* console.log("con:" + window.getComputedStyle(con).width);*/
ul.innerHTML = ul.innerHTML + ul.innerHTML;/*ul的宽度是没有变的，已经固定了，但是多出来的li已经溢出去了*/
console.log(window.getComputedStyle(ul).width);
/*只有使用getComputedStyle才能得到写在样式表中的属性*/
var left = getComputedStyle(ul).left;
/*拿出来的只是值，不是属性，所以不能进行设置*/
var width = parseInt(getComputedStyle(ul).width);/*是li溢出去了，但是ul宽度还是没有变*/
console.log(width);
var i = 0;
function move() {
if (i >= width) {
i = 0;
} else {
i++;
}
ul.style.left = -i + "px";
}
setInterval("move()", 20);
/*
/!*增加需求，鼠标移上去是停止，鼠标移开是继续滚动*!/
ul.onmouseover = function(){
clearInterval(setInterval("move()", 10));
}
ul.onmouseout = function(){
setInterval("move()", 10);
}
*/
</script>
</html>