解释下面代码的输出

Question

var a={},

    b={key:'b'},

    c={key:'c'};

a[b]=123;

a[c]=456;

console.log(a[b]);

这段代码为什么输出的是 456 ？

Answer 1

a[b] = 123会转化为a["[object Object]"] = 123a[c] = 456会转化为a["[object Object]"] = 456console.log(a[b])会转化为console.log(a["[object Object]"])因此是结果为456