JSDG 13.6

<script type="text/javascript">
/*@cc_on
  @if (@_jscript)
    // 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
    // except IE will run this code.
    alert('You are not using Internet Explorer');
/*@end
  @*/
</script>

 按理說這是IE中javascript條件注釋。

以/*@cc_on 開頭，@*/結束的。而且JScript是Microsoft自己的JavaScript解釋器的名字，而@_jscript變量在IE中為True。

但我在IE7中，似乎認不到條件注釋。

firefox卻可以。不知道是IE版本不對，還是怎么回事。