javascript - jq插件中constructor:Plugin语句有什么用？

Question

我在学习jquery自定义插件开发时参考的案例遇到的问题。

Answer 1

将构造函数指向本身，否则默认指向Object

var Plugin = function(){}
Plugin.prototype = {
    sayHello:function(){
        console.log("hello")
    }
}
var p = new Plugin()
console.log(p.constructor === Object) //true

如果加上constructor

var Plugin = function(){}
Plugin.prototype = {
    constructor: Plugin,
    sayHello:function(){
        console.log("hello")
    }
}
var p = new Plugin()
console.log(p.constructor === Plugin) //true