<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>瀑布流-扩展版02</title>
<style type="text/css">
* {
margin: 0;
padding: 0;
}
#list {
list-style: none;
position: relative;
margin: 0 auto;
}
#list li {
position: absolute;
width: 200px;
font-size: 50px;
-webkit-transition: all 0.5s;
-moz-transition: all 0.5s;
-ms-transition: all 0.5s;
-o-transition: all 0.5s;
transition: all 0.5s;
background: url(img/10.jpg);
}
</style>
</head>
<body>
<ul id="list"></ul>
</body>
<script type="text/javascript">
function flowFn() {
var list = document.getElementById("list");
var width = 200;
var padding = 10;
var heightArr = [];
//随机函数
function randFn(min, max) {
return parseInt(Math.random() * (max - min)) + min;
}
//bol值表示是否新创建元素，是则是初始化，否则只是窗体大小改变重新布局
function creatFlow(bol) {
var windowBody = document.documentElement.clientWidth;
var lis = list.getElementsByTagName("li");
var cols = parseInt(windowBody / (width + padding));
var topArr = [];
list.style.width = cols * (width + padding) + "px";
//通过列数和每个li的宽度，算出ul宽度，为了使瀑布流居中
for (var i = 0; i < cols; i++) {
topArr[i] = 0;
}
//创建li并设定样式
function createLi(index) {
var li = lis[index] || document.createElement("li"); //如果li已经存在，就用现有的，如果没有，就创建
var height = heightArr[index] || randFn(100, 300);
//如果存储高度的数组已经存在，就用现有的，如果没有，就用随机函数获取高度
li.innerHTML = index;
li.style.height = height + "px";
var minTop = topArr[0];
var minIndex = 0;
for (var i = 0; i < topArr.length; i++) {
if (minTop > topArr[i]) {
minTop = topArr[i];
minIndex = i;
}
}
li.style.top = topArr[minIndex] + "px";
li.style.left = minIndex * (width + padding) + "px";
topArr[minIndex] += (height + padding);
//新创建
if (bol) {
heightArr.push(height);
list.appendChild(li);
}
}
//把创建li的循环提出来
for (var i = 1; i < 21; i++) {
createLi(i);
}
}
//页面初始化，创建瀑布流并布局
window.onload = function(){
creatFlow(true);
}
//窗口大小改变，改变瀑布流重新布局
window.onresize = function() {
creatFlow(false);
}
}
flowFn();
</script>
</html>