ES6let [a,b] = [b,a] ES5var a = 1,b = 2;a = b+a;b = a-b;a = a-b;
let [a,b] = [b,a]
var a = 1,b = 2;a = b+a;b = a-b;a = a-b;
ES 6 这个 优秀
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