webp图片应用
<html>
<head>
<meta charset="UTF-8" />
<title>WEBP TEST</title>
<script charset="utf-8" type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
var testWebp = function(callback){
var image = new Image();
image.onerror = function() {
callback(false);
};
image.onload = function() {
callback(image.width == 1);
};
image.src = 'data:image/webp;base64,UklGRiwAAABXRUJQVlA4ICAAAAAUAgCdASoBAAEAL/3+/3+CAB/AAAFzrNsAAP5QAAAAAA==';
},webSrc = function(src){
var suffix = src.lastIndexOf('.');
suffix = src.substr(suffix);
if (/png|jpg/.test(suffix)){
return src.substr(0,(src.length-3))+'webp';
}else{
return src;
}
}
$(function(){
var $note = $('.note');
testWebp(function(SUP){
var $img = $('img[data-img]');
if(SUP){
$('body').addClass('webp');
$img.each(function(i,o){
var $o = $(o),
src = $o.attr('data-img');
$o.attr('src',webSrc(src));
});
$note.html('你载入的是<strong>webp</strong>格式');
}else{
$('body').addClass('nowebp');
$img.each(function(i,o){
var $o = $(o),
src = $o.attr('data-img');
$o.attr('src',src);
});
$note.html('你载入的是<strong>png、jpg</strong>格式');
}
});
});
</script>
<style type="text/css">
*{margin:0;padding:0;}
body{font:12px/1.6 arial,\5fae\8f6f\96c5\9ed1;color:#666;}
strong{color:#000;padding:0 2px;}
img{width:313px;height:219px;}
.img{ margin-top:20px; width:313px;height:214px; }
.webp .img{ background:url(http://demo.btorange.com/article/webp/demo2.webp) no-repeat; }
.nowebp .img{ background:url(http://demo.btorange.com/article/webp/demo2.png) no-repeat; }
</style>
</head>
<body>
<p class="note"></p>
<!-- img图片 -->
<img alt="" data-img="http://demo.btorange.com/article/webp/demo1.jpg" data-pinit="registered" />
<!-- 样式中的图片 -->
<div class="img"></div>
</body>
</html>来源于：http://blog.csdn.net/xcysuccess3/article/details/38845625
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