为什么我应该在Person Constructor(和类似的构造函数)中使用`this.name`而不是`name`？

Question

简单的问题.我为什么要这样做......

var Person = function(name) {
    this.name = name;
    this.sayHello = function(){
        console.log('Hello, my name is ' + this.name); // <-- 
    }
};

代替...

var Person = function(name) {
    this.name = name;
    this.sayHello = function(){
        console.log('Hello, my name is ' + name); // <--
    }
};

我没有发现他们表现不同的情况.

Answer 1

因此,如果有任何函数重置名称,如果你不使用,事情就不会被重新选择this.name.检查此示例

var Person = function(name) {
  this.name = name;
  this.sayHello = function() {
    console.log('Hello, my name is ' + name);
    console.log('Hello, my name is ' + this.name);// <--
  }
};
Person.prototype.resetName = function(name) {
  this.name = name;
}

var me = new Person('A');
me.sayHello();
console.log('******');
me.resetName('Ayan');
me.sayHello();