<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
ul {
list-style: none
}
* {
margin: 0;
padding: 0;
}
div {
width: 1150px;
height: 400px;
margin: 50px auto;
border: 1px solid red;
overflow: hidden;
}
div li {
width: 240px;
height: 400px;
float: left;
/*background-image: url(images/1.jpg);*/
}
div ul {
width: 1300px;
}
</style>
</head>
<body>
<div id="box">
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</div>
<script>
//找人
var box = document.getElementById("box");
var ul = box.children[0];
var lis = ul.children;
//循环遍历 lis 绑定背景图
for (var i = 0; i < lis.length; i++) {
lis[i].style.backgroundImage = "url(images/" + (i + 1) + ".jpg)";
//给每一个li注册鼠标经过事件 鼠标经过后要排他
lis[i].onmouseover = function () {
//干掉所有人 让所有人的宽度 渐渐地 变为100
for (var j = 0; j < lis.length; j++) {
animate(lis[j], {"width": 100});
}
//留下我自己 让我的宽度 渐渐地 变为800
animate(this, {"width": 800});
};
}
//鼠标离开box 所有的li宽度 渐渐地 变为240
box.onmouseout = function () {
for (var i = 0; i < lis.length; i++) {
animate(lis[i], {"width": 240});
}
};
function animate(obj, json) {
clearInterval(obj.timer);
obj.timer = setInterval(function () {
//先假设 这一次执行完 所有的属性都到达目标了
var flag = true;
for (var k in json) {
var leader = parseInt(getStyle(obj, k)) || 0;
var target = json[k];
var step = (target - leader) / 10;
step = step > 0 ? Math.ceil(step) : Math.floor(step);
leader = leader + step;
obj.style[k] = leader + "px";
//if (leader === target) {
// clearInterval(obj.timer);
//}
console.log("代码还在运行");
if (leader != target) {
flag = false;//告诉标记 当前这个属性还没到达
}
}
//如果此时仍然为true 就说明真的都到达了
if (flag) {
clearInterval(obj.timer);
}
}, 15);
}
//全部属性都到达目标值才能清空
function getStyle(obj, attr) {
if (window.getComputedStyle) {
return window.getComputedStyle(obj, null)[attr];
} else {
return obj.currentStyle[attr];
}
}
</script>
</body>
</html>
