Javascript文件的动态加载-吴统威的博客_html/css_WEB-ITnose
Javascript文件的动态加载
作者 :towaywu
2016-01-28 17:26:24.0
29 浏览
类别 :HTML/CSS/JAVASCRIPT 编程语言
Javascript文件动态加载一直是比较困扰的一件事情,像网络上传的比较常见的做法:
代码名称
function loadjs(fileurl){ var sct = document.createElement("script"); sct.src = fileurl; document.head.appendChild(sct);}然后我们来测试一下结果:
代码名称
<html> <head> <link rel="stylesheet" type="text/css" href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" media="screen" /> </head> <body> <script>
function loadjs(fileurl){ var sct = document.createElement("script"); sct.src = fileurl; document.head.appendChild(sct); } loadjs("http://code.jquery.com/jquery-1.12.0.js"); loadjs("http://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js") loadjs("http://bootboxjs.com/bootbox.js")</script> </body></html>
代码加载完后,会出现下图的错误.
jquery明明是加载在第一个处理,为什么还是报jQuery不存在的对象呢? 因为这样加载,相当于开启了三个线程,只是jquery这个文件先启动线程,而jquery执行完这个线程的时间,超过了后面两个时间. 因此后面执行完的,可能没能找到jquery这个对象.
然这种方式怎么处理呢? 其实文件的加载是有个状态处理的.文件的加载有个onload事件,就是可以监听文件是否加载完成的事件.
因此我们可以考虑这个方法来处理我们想要的结果.我们用直观的方式来处理.改进后的代码如下:
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