1.2.4.3.所有東西都是物件(或純值)
var a = {};
var b = function() {};
var c = [];
//在瀏覽器中執行
//印出Object {}
a.__proto__
//印出function Empty(){}
b.__proto__
//印出Object {}
b.__proto__.__proto__
//印出[]
c.__proto__
//印出Object {}
c.__proto__.__proto__
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