HTML条件注释与JavaScript条件注释

墨蓝 2022-05-23 05:24 223阅读 0赞

## 一、HTML条件注释和javascript条件注释说明 ##

条件注释主要是针对ie的不兼容性，通过条件注释实现以某种方式为ie编写代码，而按照另一种方式为其他浏览器编写代码。条件注释并不符合标准规范，但在处理不兼容性事非常有用。

## 二、HTML条件注释 ##

html条件注释，经测试能被ie以外的浏览器识别，输出结果与预想一致。

举个栗子：

This is normal HTML content,but IE will not display it because of  
the comment above and the comment below.

This is normal content,displayed by all browsers.

## 三、javascript条件注释 ##

Javascript条件注释只被ie中JavaScript解释器支持。

举个栗子：  
<script>  
/\*@cc\_on

@if(@\_jscript)  
  //This code is inside a JS comment but is executed in IE.  
  //This code is inside a conditional comment,which is also a   
  //regular Javascript comment.IE runs it but other browsers ignore it.  
  alert("You are using Internet Explorer");  
 @else\*/  
  //This code is no longer inside a Javascript comment,but is still  
  //inside the IE conditional comment. This means that all browsers  
  //excepte IE will run this code.  
  alert("you are not using Internet Explorer");  
 /\*@end  
 @\*/  
 </script>

(以上案例参考Java权威指南Page 332)

原文链接地址：[https://www.cnblogs.com/qingqingcai/p/3357393.html][https_www.cnblogs.com_qingqingcai_p_3357393.html]

相关链接：[条件注释完整语法说明][Link 1]

[https_www.cnblogs.com_qingqingcai_p_3357393.html]: https://www.cnblogs.com/qingqingcai/p/3357393.html
[Link 1]: https://jingyan.baidu.com/article/afd8f4deab510234e286e92e.html