How to exchange values ​​in javascript

Javascript method for numerical exchange: 1. Use intermediate variables for numerical exchange, the syntax "c=a;a=b;b=c;"; 2. Use array exchange for numerical exchange, the syntax " a=[b,b=a]”.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Now there is var a = 1,b = 2;. It is required to use javascript to exchange the values ​​​​of a and b, so that a = 2,b = 1.

1. Intermediate variables (conventional implementation)

var a = 1, b = 2;
var c = a;
a = b;
b = c;
console.log(a); // 2
console.log(b); // 1

2. Array exchange (implementation)

var a = 1, b = 2;
a = [b,b = a];
console.log(a); // 2
console.log(b); // 1

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