javascript 中的 ! 运算符的使用.
2007-08-15 23:13 爱车龟速兔 阅读(215) 评论(1) 编辑 收藏 举报 在看ajax的时候, 看见一段创建XMLHttpRequest对象的代码,
代码片段如下:
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockEnd.gif)
![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
其中 对!xmlHttp 略微有点迷惑, 待查.
---------------------
8.23 补充:
这几句语句是利用了javascript变量是弱类型的特点, 看习惯了c#的代码, 对这种代码不是很习惯,以后多看看就好了.
在看ajax的时候, 看见一段创建XMLHttpRequest对象的代码,
代码片段如下:
其中 对!xmlHttp 略微有点迷惑, 待查.
---------------------
8.23 补充:
这几句语句是利用了javascript变量是弱类型的特点, 看习惯了c#的代码, 对这种代码不是很习惯,以后多看看就好了.