What is the running process of new operator in js

例：var obj = new Base(); 
该步一共做了三件事：即 
   var obj  = {}; obj.__proto__ = Base.prototype; Base.call(obj);  

第一行，我们创建了一个空对象obj
第二行，我们将这个空对象的__proto__成员指向了Base函数对象prototype成员对象
第三行，我们将Base函数对象的this指针替换成obj。

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