{key: 'b'}
{key: 'c'}
b
c
var a = {},b={key:'b'},c={key:'c'} a[b] = 'b' // a = {[object Object]: "b"} a[c] = 'c' //a = {[object Object]: "c"} a[b] // "c",实际打印的是a["[object Object]"]
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