Javascript中的构造函数是'；行不通

我需要提示输入5个属性，然后获取测试分数并获得测试1、2和3的平均值，然后显示名称和平均值。我无法使用它来显示或运行该函数。我的代码有什么问题

function Student(_firstName, _lastName, _t1, _t2, _t2){

    this.firstName = _firstName ;
    this.lastName = _lastName ;
    this.test1 = _t1 ;
    this.test2 = _t2 ;
    this.test3 = _t3 ;

    this.fullName = function() { return this.firstName + " " + this.lastName } ;

    this.calcAverage = function() { return (this.test1 + this.test2 + this.test3) / 3 } ;

}

var name1 = prompt("Enter the first name:") ;
var name2 = prompt("Enter the last name:") ;
var te1 = parseInt(prompt("Enter the first test score:")) ;
var te2 = parseInt(prompt("Enter the second test score:")) ;
var te3 = parseInt(prompt("Enter the third test score:")) ;

var person = new Student(name1, name2, te1, te2, te3) ;

document.write(+name1+ " " +name2+ " " + person.calcAverage() +) ;

工作代码

function Student(_firstName, _lastName, _t1, _t2, _t3) {

    this.firstName = _firstName;
    this.lastName = _lastName;
    this.test1 = _t1;
    this.test2 = _t2;
    this.test3 = _t3;

    this.fullName = function () {
        return this.firstName + " " + this.lastName
    };

    this.calcAverage = function () {
        return (this.test1 + this.test2 + this.test3) / 3;
    };

}

var name1 = prompt("Enter the first name:");
var name2 = prompt("Enter the last name:");
var te1 = parseInt(prompt("Enter the first test score:"));
var te2 = parseInt(prompt("Enter the second test score:"));
var te3 = parseInt(prompt("Enter the third test score:"));

var person = new Student(name1, name2, te1, te2, te3);

document.write(+name1 + " " + name2 + " " + person.calcAverage());

修正你的打字错误：

function Student(_firstName, _lastName, _t1, _t2, _t3) {
                                                   ^^ _t3, not _t2

document.write(+ name1 + " " + name2 + " " + person.calcAverage() +);
               ^^ remove +                                        ^^ remove +

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这有什么用？控制台中有错误吗？有很多错误。参数名称为双精度，document.write具有不必要的“+”符号。