// 方案1
var a = 0;
var b = 1;
var c = a;
a = b;
b = c;
console.log(a,b);
// 1 0

// 方案2
var a = 0;
var b = 1;
a = a + b;
b = a-b;
a = a-b;
console.log(a,b);
// 1 0

// 方案3
var a = 'www';
var b = 'bbb';
a = {a:b,b:a};
b = a.b;
a = a.a;
console.log(a,b);
// bbb www

// 方案4
var a = 0;
var b = 1;
a = [a,b];
b = a[0];
a = a[1];
console.log(a,b);
// 1 0

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