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<head>
<script src="//code.jquery.com/jquery-1.9.1.min.js"></script>
<meta charset="utf-8">
<title>JS Bin</title>
<style>
.container {
max-width: 800px;
margin: 0 auto;
}
.container:after{
content: '';
display: block;
clear: both;
}
.container img {
float: left;
width: 50%;
}
h1{
clear: both;
}
</style>
</head>
<body>
<div class="container">
<img src="http://smashinghub.com/wp-content/uploads/2014/08/cool-loading-animated-gif-3.gif" alt="1" data-src="http://cdn.jirengu.com/book.jirengu.com/img/1.jpg">
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<h1 id="target">hello</h1>
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</div>
</body>
</html>
start()
function isShow($node) {
var $winHeight = $(window).height() //获取视口高度
var $scrollTop = $(window).scrollTop() //获取视口滚动距离
var $offset = $node.offset().top //获取图片top位置与视口顶部距离
var $nodeHeight = $node.outerHeight(true) //获取图片自身高度
if ($winHeight + $scrollTop >= $offset + $nodeHeight) {
return true
} else {
return false
}
}
function start() {
let timer = null
$(window).on('scroll', function (e) {
return !function () { //函数节流
clearTimeout(timer)
console.log()
timer = setTimeout(function () {
$('.container img').not('[data-isloaded=1]').each(function () {
if (isShow($(this))) {
loadImg($(this))
}
})
}, 500)
}()
})
}
function loadImg($img) {
$img.attr('src', $img.attr('data-src'))
$img.attr('data-isloaded',1)
}
$(window).trigger('scroll')
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