javascript - jq插件中constructor:Plugin語句有什麼用？

Question

我在學習jquery自訂外掛程式開發時參考的案例遇到的問題。

Answer 1

將建構子指向本身，否則預設指向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