瀑布流
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
.itemBox {
width: 1050px;
margin: 0 auto;
position: relative;
}
.item {
border: 1px solid #ccc;
padding: 4px;
position: absolute;
}
</style>
</head>
<body>
<div class="itemBox">
<div class="item">
<img src="./images/P_000.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_001.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_002.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_003.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_004.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_005.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_006.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_007.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_008.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_009.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_000.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_001.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_002.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_003.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_004.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_005.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_006.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_007.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_008.jpg" alt="">
</div>
<div class="item">
<img src="./images/P_009.jpg" alt="">
</div>
</div>
</body>
<script>
window.onload = function () {
/*
思路分析
1 获取到.itemBox 宽度
2 获取到.item 宽度
3 求出列数
4 求出间距
5 实现瀑布流布局的方法
6 滚动页面时 加载数据
*/
// 获取到相关元素
var itemBox = document.getElementsByClassName('itemBox')[0];
var items = document.getElementsByClassName('item');
// 1 获取到.itemBox 宽度
var itemBoxW = itemBox.offsetWidth;
// 2 获取到.item 宽度
var itemW = items[0].offsetWidth;
// 3 求出列数
var column = parseInt(itemBoxW / itemW);
// 4 求出间距
var distence = (itemBoxW - itemW * column) / (column - 1);
console.log(distence);
// 5 实现瀑布流布局的方法
// 定义一个存储每列高度的容器
var arr = [];
waterFull();
// 6 滚动页面时 加载数据
window.onscroll = function () {
if (window.pageYOffset + window.innerHeight > getMin(arr).minV) {
var json = [
{ "src": "./images/P_000.jpg" },
{ "src": "./images/P_001.jpg" },
{ "src": "./images/P_002.jpg" },
{ "src": "./images/P_003.jpg" },
{ "src": "./images/P_004.jpg" },
{ "src": "./images/P_005.jpg" },
{ "src": "./images/P_006.jpg" },
{ "src": "./images/P_007.jpg" },
{ "src": "./images/P_008.jpg" },
{ "src": "./images/P_009.jpg" },
{ "src": "./images/P_010.jpg" }
];
for (var i = 0; i < json.length; i++) {
var div = document.createElement('div');
div.className = 'item';
var img = document.createElement('img');;
img.src = json[i].src;
div.appendChild(img);
itemBox.appendChild(div);
}
waterFull();
}
}
// 实现瀑布流布局的方法
function waterFull() {
for (var i = 0; i < items.length; i++) {
if (i < column) {
items[i].style.left = (itemW + distence) * i + 'px';
arr[i] = items[i].offsetHeight;
// console.log(arr);
} else {
var minV = getMin(arr).minV;
var index = getMin(arr).index;
items[i].style.left = (itemW + distence) * index + 'px';
items[i].style.top = minV + distence + 'px';
arr[index] = minV + distence + items[i].offsetHeight;
}
}
}
// 获取数组的最小值以及索引
function getMin(arr) {
var obj = {};
obj.minV = arr[0];
obj.index = 0;
for (var i = 1; i < arr.length; i++) {
if (obj.minV > arr[i]) {
obj.minV = arr[i];
obj.index = i;
}
}
return obj;
}
}
</script>
</html>
