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Exposure module.html
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Exposure module.html
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<!DOCTYPE html>
<html lang="en">
<head>
<script src="https://cdn.bootcss.com/jquery/3.2.1/jquery.js"></script>
<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>曝光组件_图片懒加载</title>
</head>
<body>
<style>
ul,
li {
list-style: none;
}
.container {
max-width: 800px;
margin: 0 auto;
}
.container:after {
content: '';
display: block;
clear: both;
}
.container li {
float: left;
margin: 10px 10px;
}
.container li img {
width: 380px;
height: 380px;
}
p {
float: left;
}
</style>
</head>
<body>
<ul class="container">
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/1.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/1.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/2.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/3.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/4.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/5.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/6.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/7.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/8.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/9.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/10.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/11.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/12.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/13.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/14.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/15.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/16.jpg" /></a></li>
<li><a href="#"><img src="http://kejian.jirengu.com/data/fe/%E8%AF%BE%E4%BB%B6/32-%E6%87%92%E5%8A%A0%E8%BD%BD/code/blank.jpg" data-src="http://cdn.jirengu.com/book.jirengu.com/img/17.jpg" /></a></li>
</ul>
<script type="text/javascript">
function Exposure($target, callback) {
this.$target = $target;
this.callback = callback;
this.bind();
this.check();
}
Exposure.prototype.bind = function () {
var _this = this;
$(window).on('scroll', function () {
_this.check();
})
}
Exposure.prototype.check = function () {
if (this.isShow(this.$target)) {
this.callback(this.$target);
}
}
Exposure.prototype.isShow = function () {//3-1 可以访问到this,因为在一个函数里面
var windowHeight = $(window).height(),
scrollTop = $(window).scrollTop(),//滚动距离
offsetTop = this.$target.offset().top,//位移
nodeHeight = this.$target.height();
if (windowHeight + scrollTop > offsetTop && scrollTop < offsetTop + nodeHeight) {
return true;
} else {
return false;
}
}
var Lazy = (function () {
return {
init: function ($targets, callback) {
$targets.each(function (idx, target) {
new Exposure($(target), callback);
})
}
}
})();
Lazy.init($('.container img'), function ($node) {
showImg($node);
});
function showImg($img) {
var imgUrl = $img.attr('data-src');
$img.attr('src', imgUrl);
}
</script>
</body>
</html>