javascript - JS : Is there a difference between class. 原型(prototype).构造函数和类.构造函数

Question

在我正在阅读的教程中，有一部分我不明白:

function User (theName, theEmail) {
    this.name = theName;
    this.email = theEmail;
    this.quizScores = [];
    this.currentScore = 0;
}
​
User.prototype = {
    constructor: User,
    saveScore:function (theScoreToAdd)  {
        this.quizScores.push(theScoreToAdd)
    },
    showNameAndScores:function ()  {
        var scores = this.quizScores.length > 0 ? this.quizScores.join(",") : "No Scores Yet";
        return this.name + " Scores: " + scores;
    },
    changeEmail:function (newEmail)  {
        this.email = newEmail;
        return "New Email Saved: " + this.email;
    }
}

我已阅读该帖子并检查了网络，但我不太明白，User.constructor 和 User.prototype.constructor 之间有区别吗？ (如9号线)

Answer 1

User.constructor 设置User 实例的构造函数。 User.prototype.constructor 设置所有实例的构造函数。因此，如果您设置

User.prototype.constructor = function test(){};

然后

new User().constructor

也将是test函数。