我可以使用带有两个变量的 case/switch 语句吗?

问题描述

我是 JavaScript 的新手，我的理解是使用一个 SWITCH/CASE 语句比使用一大堆 IF 语句要快.

I am a newbie when it comes to JavaScript and it was my understanding that using one SWITCH/CASE statements is faster than a whole bunch of IF statements.

但是，我想使用带有两个变量的 SWITCH/CASE 语句.

However, I want to use a SWITCH/CASE statement with two variables.

我的网络应用有两个滑块，每个滑块有五个状态.我希望行为基于这两个变量的状态.显然，这是一大堆 IF/THEN 语句.

My web app has two sliders, each of which have five states. I want the behavior to be based on the states of these two variables. Obviously that is a whole heck of a lot of IF/THEN statements.

我想到的一种方法是将两个变量连接成一个变量，然后我可以 SWITCH/CASE 那个.

One way I thought about doing it was concatenating the two variables into one and then I could SWITCH/CASE that.

有没有更好的方法来完成使用两个变量的 SWITCH/CASE ?

Is there a better way of accomplishing a SWITCH/CASE using two variables ?

谢谢！

推荐答案

是的，你也可以这样做:

Yes you can also do:

    switch (true) {

     case (var1 === true && var2 === true) :
       //do something
       break;
     case (var1 === false && var2 === false) :
       //do something
       break;

      default:

    }

这将始终执行切换，与 if/else 非常相似，但看起来更简洁.只需继续检查 case 表达式中的变量即可.

This will always execute the switch, pretty much just like if/else but looks cleaner. Just continue checking your variables in the case expressions.

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