javascript - 使用if-else速记时省略第二个表达式(Omitting the second expression when using the if-else shorthand)

Question

Can I write the if else shorthand without the else ?(if else没有else我可以写if else速记吗？)

var x=1; x==2 ? dosomething() : doNothingButContinueCode(); I've noticed putting null for the else works (but I have no idea why or if that's a good idea).(我注意到将else设置为null可以使其他作品有效（但是我不知道为什么或如果那是个好主意）。) Edit: Some of you seem bemused why I'd bother trying this.(编辑：你们中有些人似乎感到困惑，为什么我要尝试这个。) Rest assured it's purely out of curiosity.(请放心，这完全是出于好奇。) I like messing around with JavaScript.(我喜欢弄乱JavaScript。)   ask by Nikki translate from so

Answer 1

What you have is a fairly unusual use of the ternary operator .(您所拥有的是三元运算符的一种非常不寻常的用法。)

Usually it is used as an expression, not a statement, inside of some other operation, eg:(通常，它在某些其他操作中用作表达式，而不是语句，例如：) var y = (x == 2 ? "yes" : "no"); So, for readability (because what you are doing is unusual), and because it avoids the "else" that you don't want, I would suggest:(因此，出于可读性考虑（因为您正在做的事很不寻常），并且由于它避免了您不希望的“其他”情况，我建议：) if (x==2) doSomething();