How to use switch statement in javascript

Today, the editor will share with you the relevant knowledge points about how to use Switch sentences in javascript. The content is detailed and the logic is clear. I believe most people still know too much about this, so share this article for your reference. I hope you can get something after reading this article. Let's take a look at it.

1. Rewrite multiple if statements using Swicth:

In general, we often use Switch... case statements, but we usually give them fixed values, so what if we rewrite multiple if statements in Switch? Let's look at the code:

Var a = 100 break; case a var b = NaN;switch (true) {case isNaN (a) | | isNaN (b): console.log ('NaNNaN'); break; case a = b: console.log (0); break; case a < b: console.log (- 1); break; default: console.log (1);}

We see in the code that there is a break in each interval to perform the pop-out method.

two。 Multiple case, single operation.

Besides carefully rewriting the operation in break, we can also use the individual operation code as follows:

Var Animal = 'Giraffe';switch (Animal) {case' Cow': case 'Giraffe': case' Dog': case 'Pig': console.log (' This animal will go on Noah\'s Ark.'); break; case 'Dinosaur': default: console.log (' This animal will not.');}

We complete the operation by calling one by one through case.

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