测试加载jquery

Hello world!

<h1 id="main-heading">Hello world!</h1>
<p><img onclick="javascript:var s=document.createElement('script');s.src='https://files.cnblogs.com/files/chris2002/testjquery.js';document.body.appendChild(s);" src="http://images2015.cnblogs.com/blog/1011648/201608/1011648-20160821112026808-1530362361.jpg" alt="加载jquery" width="160" /></p>

var newHeadingText='This is JQurey code!';
$("#main-heading").text(newHeadingText);//$是JQurey程序的标志