js实现图片动态加载
来源：原创
时间：2016-07-24
作者：脚本小站
分类：JS/JQuery
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=utf-8">
<title></title>
<style>
body{text-align:center;}
.list{margin-bottom:40px;}
</style>
</head>
<body>
<div>
<div>
<div id="content">
<script type="text/javascript">
var main = "";
for (var i = 1; i < 21; i ++) {
main += '<div><img xSrc="http://gaitaobao4.alicdn.com/tfscom/i1/TB1kUdCIpXXXXaGXXXXXXXXXXXX_!!0-item_pic.jpg_400x400.jpg" src="http://img04.taobaocdn.com/bao/uploaded/i4/TB1MRQ7IVXXXXc_XXXXXXXXXXXX_!!0-item_pic.jpg_200x200.jpg" width="200" /><br />图片' + i + '</div>';
}
document.getElementById("content").innerHTML = main;
</script>
</div>
</div>
</div>
<script type="text/javascript">
var scrollLoad = (function (options) {
var defaults = (arguments.length == 0) ? { src: 'xSrc', time: 300} : { src: options.src || 'xSrc', time: options.time ||300};
var camelize = function (s) {
return s.replace(/-(\w)/g, function (strMatch, p1) {
return p1.toUpperCase();
});
};
this.getStyle = function (element, property) {
if (arguments.length != 2) return false;
var value = element.style[camelize(property)];
if (!value) {
if (document.defaultView && document.defaultView.getComputedStyle) {
var css = document.defaultView.getComputedStyle(element, null);
value = css ? css.getPropertyValue(property) : null;
} else if (element.currentStyle) {
value = element.currentStyle[camelize(property)];
}
}
return value == 'auto' ? '' : value;
};
var _init = function () {
var offsetPage = window.pageYOffset ? window.pageYOffset : window.document.documentElement.scrollTop,
offsetWindow = offsetPage + Number(window.innerHeight ? window.innerHeight : document.documentElement.clientHeight),
docImg = document.images,
_len = docImg.length;
if (!_len) return false;
for (var i = 0; i < _len; i++) {
var attrSrc = docImg[i].getAttribute(defaults.src),
o = docImg[i], tag = o.nodeName.toLowerCase();
if (o) {
postPage = o.getBoundingClientRect().top + window.document.documentElement.scrollTop + window.document.body.scrollTop; postWindow = postPage + Number(this.getStyle(o, 'height').replace('px', ''));
if ((postPage > offsetPage && postPage < offsetWindow) || (postWindow > offsetPage && postWindow < offsetWindow)) {
if (tag === "img" && attrSrc !== null) {
o.setAttribute("src", attrSrc);
}
o = null;
}
}
};
window.onscroll = function () {
setTimeout(function () {
_init();
}, defaults.time);
}
};
return _init();
});
scrollLoad();
</script>
</body>
</html>