https://js.do/powenko/348767

[javascript]

var a=[], b={};
a.push(b);

console.log(a);

[/javascript]

輸出：
0: {}

[javascript]

var c=[];
var b={"a":"1","b":"2"};
c.push(b);
console.log(c);
[/javascript]

輸出：
0: {a: “1”, b: “2”}