Question

//代码开始

function Person(name) {
    this.name = name;
    console.log(this.name); //Output 1    
    console.log(this); //Output 2    
}
var p1 = new Person("Object_Shashank");
var p2 = Person("Function_Shashank");

//代码结束

p1：

输出1：Object_Shashank
输出2：人{姓名：＆＃34; Object_Shashank＆＃34;}

p2：

输出1：Function_Shashank
输出2：窗口{speechSynthesis：SpeechSynthesis，caches：CacheStorage，localStorage：Storage，sessionStorage：Storage，webkitStorageInfo：DeprecatedStorageInfo ...}

有人可以解释＆＃34; p2：输出2＆＃34;

Answer 1

它打印window对象，因为this引用了窗口对象。

function Person(name){   
    this.name=name;    
    console.log(this.name); //Output 1    
    console.log(this);  //Output 2    <-- this `this` will point to the object it belongs to ,  which in this case of p1  is Object_Shashank while for p2 is window
}    
var p1=new Person("Object_Shashank");   
var p2=Person("Function_Shashank");  // Equivalent to p2 = window.Person("Function_Shashank")

编辑。添加了代码示例

对象与普通函数

1 个答案: