如何在 Javascript 中编写 OR？
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How to write OR in Javascript?
提问by Dany
How do you write ORin Javascript?
你是如何OR用 Javascript编写的？
Example :
例子 ：
if ( age **or** name == null ){
do something
}
回答by David says reinstate Monica
Simply use:
只需使用：
if ( age == null || name == null ){
// do something
}
Although, if you're simply testing to see if the variables have a value (and so are 'falsey' rather than equal to null) you could use instead:
虽然，如果您只是简单地测试变量是否具有值（因此是 'falsey' 而不是 equal to null），您可以改用：
if ( !age || !name ){
// do something
}
References:
参考：
回答by user1103976
if (age == null || name == null) {
}
Note: You may want to see this thread, Why is null an object and what's the difference between null and undefined?, for information on null/undefined variables in JS.
注意：你可能想看看这个线程，为什么 null 是一个对象，null 和 undefined 之间有什么区别？, 有关 JS 中空/未定义变量的信息。
回答by Stephen Garle
The problem you are having is the way that or associates. (age or name == null)will actually be ((age or name) == null), which is not what you want to say. You want ((age == null) or (name == null)). When in doubt, insert parentheses. If you put in parentheses and evaluated, you would have seen that the situations became something like (true == null)and (false == null).
您遇到的问题是方式或关联。 (age or name == null)实际上将是((age or name) == null)，这不是您想说的。你要((age == null) or (name == null))。如有疑问，请插入括号。如果您放入括号并进行评估，您会看到情况变成了(true == null)和(false == null)。
回答by Alireza
We don't have ORoperator in JavaScript,we use ||instead, in your case do...:
我们在JavaScript 中没有OR运算符，我们||改为使用，在您的情况下做...：
if (age || name == null) {
//do something
}
