是否有过一个理由，写＆QUOT;若（myBoolean ==真）＆QUOT;在JavaScript的条件？ [英] Is there ever a reason to write "if (myBoolean == true)" in a JavaScript conditional?

问题描述

很多初级程序员写出来的东西像如果（myBoolean == true）而，而不是如果（myBoolean）作为他们尚未掌握该条件语句不需要包含一比较，仅仅一个布尔值。当我提到这在twitter上有人向我建议在JavaScript中有可能是一个很好的理由这样做。在那里？我们都知道的JavaScript类型是陌生的，但谷歌得出这个特定点没有答案。

Many beginner programmers write things like if (myBoolean == true) as opposed to if (myBoolean) as they haven't yet grasped that conditionals don't need to contain a comparison, merely a boolean. When I noted this on twitter it was suggested to me that in JavaScript there might be a good reason to do this. Is there? We all know JavaScript types are strange, but Google yields no answers on this specific point.

更新：似乎没有区别，但有将与一个区别，如果（myBoolean ===真）。因此，要澄清的问题 - 这将是在JavaScript中，如果（myBoolean ===真）或者（myBoolean）的最佳实践。在什么真实的场景中，你会成为检查 ===真正来的东西，你不知道的是一个布尔值？请在此跟进的问题回答：<一href=\"http://stackoverflow.com/questions/13250664/why-is-it-good-practice-to-use-if-myboolean-true-in-javascript\">Why它是很好的做法，使用if（myBoolean ===真）在JavaScript中？

Update: It seems there is no difference, however there would be a difference with if (myBoolean === true). So to clarify the question - what would be the best practice in JavaScript if (myBoolean === true) or if (myBoolean). In what real-world scenario would you be checking === true to something that you don't know is a boolean? Please answer in this follow-up question: Why is it good practice to use if (myBoolean === true) in JavaScript?

推荐答案

没有。

由于您使用non-strict平等运营商，也绝对没有什么区别：

Since you're using the non-strict equality operator, there is absolutely no difference between:

if (myBoolean == true)

和

if (myBoolean)

有将是一个区别，如果你使用全等运算符 === 和 myBoolean 本来就不是一个布尔值，虽然。

There would be a difference if you were using the strict equality operator === and myBoolean was not actually a boolean, though.

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