这种注释和HTML中很像，也就是它可以在"查看源代码\"中看到. 唯一有些不同的就是，你可以在这个注释中用表达式（例子2所示).这个表达示是不定的，由页面不同而不同，你能够使用各种表达式，只要是合法的就行。更多的请看表达式-HTML in comments and such like, that is, it can be in the　View source　to see. The only thing is a bit different, you can use regular expressions in this comment (example 2 below). This expression is that uncertain by their nature, differ from the page, you can use a variety of expressions, as long as it is lawful on the line. See more expressions