- prototype:每个对象都有prototype
- __ proto __:对象实例的指针
任何对象的prototype属性对应该对象实例的proto
var obj={}
console.log(obj.__proto__==Object.prototype)true
var arr = []
console.log(arr.__proto__==Array.prototype) //true
console.log(arr.__proto__.__proto__==Object.prototype)//true
console.log(Array.prototype.__proto__==Object.prototype)//true
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