While true and false might appear to be keywords, they are technically boolean literals (§3.10.3). Similarly, while null might appear to be a keyword, it is technically the null literal (§3.10.7).
这是官方文档上给的true和false 你看看 也可以到我上次的帖子看看 里面有很全的;按你这么说null也是的了吗??? |