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疑問匯總（也許日后能慢慢搞明白）：

疑問1：位于第三章，26頁

The first concept to understand is that everything is case-sensitive; variables, function names, and operators are all case-sensitive, meaning that a variable named test is different from a variable named Test. Similarly, typeof can’t be the name of a function because it’s a keyword (described in the next section); however, typeof is a perfectly valid function name.

 

推薦的開發習慣：

1：每個語句都以分號結束。

2：if語句用花括號包住。

3：不要使用關鍵字和保留字。

 

經驗總結：

1，let在一些低版本的手機上還是不支持的。