jquery性能优化高级技巧

<!-- Case 1 - jQuery CDN -->
<script src="http://code.jquery./jquery-1.10.2.min.js" ></script>
<!-- Case 2 - requesting jQuery from Googles CDN (notice the protocol) -->
<script src="//ajax.googleapis./ajax/libs/jquery/1.10.2/jquery.min.js" ></script>
<!-- Case 3 - requesting the latest minor 1.10.x version (only cached for an hour) -->
<script src="//ajax.googleapis./ajax/libs/jquery/1.10/jquery.min.js" ></script>
<!-- Case 4 - requesting the absolute latest jQuery version (use with caution) -->
<script src="http://code.jquery./jquery.min.js" ></script>

http://.bootcdn./jquery/
<!--新浪 CDN-->
<script src="http://lib.sinaapp./js/jquery/1.9.1/jquery-1.9.1.min.js"></script>
<!--百度 CDN-->
<script src="http://libs.baidu./jquery/1.9.1/jquery.min.js"></script>
<!--Bootstrap CDN-->
http://.bootcdn./jquery/

<div id="elem" ></div>

// 不好的方式
//var elem = $('#elem');
//for(var i = 0; i < 100; i++){
// elem.append('<li>element '+i+'</li>');
/