window.innerWidth / window.innerHeight 是长宽比，保证画面不变形。
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。PDF资料是该领域的重要参考
a $ # b; // This can be either '(a$) # b' or 'a $ (#b)'.Another issue is lookahead. In an LL(1) parser, you can’t immediately tell whether an infix–postfix operator is infix or postfix without looking ahead. That’s one reason C (and most other languages) avoids them.
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