JavaScript Lint inc_dec_within_stmt警告 [英] JavaScript Lint inc_dec_within_stmt warning

问题描述

有人可以解释为什么javascriptlint（不是jslint）给出警告的原因/重要性

Can someone explain the reason/importance of why javascriptlint (not jslint) gives the warning

inc_dec_within_stmt - increment (++) and decrement (--) operators used as part of greater statement

当遇到一行代码如

someValue = count++;

我为什么要打开此支票？

Why should I keep this check turned on?

推荐答案

这是一个警告，因为这样的陈述对人类读者来说可能是模棱两可的。

It's a warning because a statement like that can be ambiguous to human readers.

你和我可以看一下并且理解它相当于

While you and I can look at that and understand that it is equivalent to

someValue = count;
count = count + 1;

经验不足的程序员可能错误地将其解释为

a less experienced programmer might incorrectly interpret that as

someValue = count + 1;

当然，这是最简单的例子。警告更像是

Of course, this is the simplest example. The warning is much more deserved in a line like

someValue = (count++) * (--index) / (3 * ++j);

虽然我不能说我在生产代码中见过这样的一行：）

although I can't say I've ever seen a line like that in production code :)

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