如果注释是安全的，那么为什么不用`x = 0; x + / * cmt * / +;`或`var f / * cmt * / oo ='foo';`work？ [英] If comments are safe, then why doesn't `x = 0; x+/*cmt*/+;` or `var f/*cmt*/oo = 'foo';` work?

问题描述

这个线程灵感问题。这里是代码示例。

This thread inspired the question. Here are the code samples again. I'm looking for an answer that tells exactly what is going on.

两个 x = 0; x + / * cmt * / +; 和 var f / * cmt * / oo ='foo'; 产生语法错误，在此问题错了。

Both x = 0; x+/*cmt*/+; and var f/*cmt*/oo = 'foo'; produce syntax errors, which renders the answers in this question wrong.

推荐答案

从 ECMAScript参考：

注释表现得像空格，并且被丢弃，除非，如果
MultiLineComment包含一个行终止符字符，
注释被认为是一个LineTerminator，用于通过语法语法解析
。

Comments behave like white space and are discarded except that, if a MultiLineComment contains a line terminator character, then the entire comment is considered to be a LineTerminator for purposes of parsing by the syntactic grammar.

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