测试加载jquery
Hello world!
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
<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>
![](https://images.cnblogs.com/OutliningIndicators/ContractedBlock.gif)
var newHeadingText='This is JQurey code!'; $("#main-heading").text(newHeadingText);//$是JQurey程序的标志