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问题描述

通常我写的东西都是......


if(x == 1){doSomething()}


...这就是我在所有JS发现中看到它的方式我已经找到了这么多

远。


但是我看到了简写(? )对于同样的事情(?),像这样...


(x == 1)? doSomething()


....和其他几个替代方法。


它们是否记录在某处?我有点像他们,但他们是否支持通常的浏览器团队?
?或者使用它们是愚蠢

因为它们是条纹/马虎?


Thnx提前:)

Usually I write something like ...

if (x==1) { doSomething() }

.... and that''s how I see it in all the JS references I''ve found so
far.

But I have seen shorthand (?) for the same thing (?), like this ...

(x==1) ? doSomething()

.... and several other "alternate" methods.

Are they documented somewhere? I kinda like them, but are they
supported in the usual gang of browsers? or is it stupid to use them
because they are fringe/sloppy?

Thnx in advance :)

推荐答案



这通常被称为三元表达式你的例子是

错过了它的第三部分。


条件?true:false


是构造。如果条件为真则真实部分执行

,如果为假则执行错误部分。

That is commonly called a "ternary expression" and your example is
missing the third part of it.

condition?true:false

Is the construct. If the condition is true then the true part gets
executed, if it is false then the false part gets executed.



三元运算符没有什么愚蠢的。


-

Randy

机会有利于准备好的心灵

comp.lang.javascript常见问题 -

Javascript最佳实践 -




条件?expression1:expression2


如果条件为真,运算符_returns_ expression1,

否则返回expression2。


condition?expression1:expression2

The operator _returns_ expression1 if the condition is true,
otherwise it returns expression2.



http://msdn2.microsoft.com/en-us/library/be21c7hw.aspx





条件?expression1:expression2


运算符_returns_ expression1如果条件为真,

否则返回expression2。



condition?expression1:expression2

The operator _returns_ expression1 if the condition is true,
otherwise it returns expression2.



是的,但无视使用,

或没有结果值,

它可以是和经常使用

只是执行其中一个表达式:

(a> 27.3)?警告(''high''):警报(''低'');

-

Evertjan。

荷兰。

(请将我的电子邮件地址中的x'变为点数)

True, but disregarding the use of,
or in absense of a result value,
it can be and often is used
simply to execute one of those expressions:
(a>27.3) ? alert(''high'') : alert(''low'');
--
Evertjan.
The Netherlands.
(Please change the x''es to dots in my emailaddress)


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09-23 13:26