求大虾帮忙看下这段是干什么用的。

Question

javascript

Answer 1

js加载一个脚本，当脚本加载完后执行done()事件？  
这个checkNonTxDomain是什么？Tx指腾讯？

Answer 2

不明白这种写法
 security_s.readyState ? security_s.readyState.toLowerCase() == 'loaded' && done() : done();一直在判断加载状态。 可以后面跟执行的方法？

Answer 3

根据页面的安全状态判断是否执行页面加载函数吧，页面加载完后都要执行done()函数

Answer 4

1.>动态创建一个script标签 去服务器加载 "http://mat1.gtimg.com/www/js/common.js"这个js脚本
2.>当这个脚本加载成功后，去执行done这个方法，方法里面的checkNonTxDomain应该是上面这个js中的方法

Answer 5

三元运算符， 你可以看成是if else的精简版

Answer 6

三元运算符， 你可以看成是if else的精简版谢谢查了写资料做个小实验，弄明白了这种写法。但对于这个帖子来说我还有个疑问：
下面是我搜到的资料
http://www.cnblogs.com/_franky/archive/2010/06/20/1761370.htmlsecurity_s.readyState 会有不同的状态， 
当security_s.readyState有值且值为loaded 时执行 done（）
那什么时候会执行 ：done（）呢？security_s.readyState 什么时候是false呢？

Answer 7

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Answer 8

三元运算符， 你可以看成是if else的精简版谢谢查了写资料做个小实验，弄明白了这种写法。但对于这个帖子来说我还有个疑问：
下面是我搜到的资料
http://www.cnblogs.com/_franky/archive/2010/06/20/1761370.htmlsecurity_s.readyState 会有不同的状态， 
当security_s.readyState有值且值为loaded 时执行 done（）
那什么时候会执行 ：done（）呢？security_s.readyState 什么时候是false呢？
未初始化的时候就是0，即false