Question

我有一个语法错误，我不知道如何修复。这是代码：

function computer(speed, hdspace, ram)
{
    this.speed=speed;
    this.hdspace=hdspace;
    this.ram=ram;
    this.price=get_price();
}
function get_price()
{
    var the_price=500;
    the_price += (this.speed == "2GHz") ? 200 : 100;
    the_price += (this.hdspace == "80GB") ? 50 : 25;
    the_price += (this.ram == "1GB") ? 150 : 75;
    return the_price;
}

var work_computer = new computer("2GHz", "80GB", "1GB");
var home_computer = new computer("1.5GHz", "40GB", "512MB");
var laptop_computer = new computer("1GHz", "20GB", "256");

var price = get_price();
var work_computer_price = work_computer.price();
var home_computer_price = home_computer.price();
var laptop_computer_price = laptop_computer.price();

document.write("<h1>Prices of the computers you requested:</h1>");
document.write("<h3><br/>Work Computer: </h3>"+work_computer);
document.write("Price: $"+work_computer_price);
document.write("<br/>");
document.write("Home Computer: "+home_computer);
document.write("Price: $"+home_computer_price);
document.write("<br/>");
document.write("Laptop Computer: "+laptop_computer);
document.write("Price: $"+laptop_computer_price);

在第22行，有一个错误说：未捕获TypeError：对象＃的属性'价格'不是函数这是第22行：

var work_computer_price = work_computer.price();

请帮忙。谢谢！

Answer 1

分配this.price时取消括号：

this.price=get_price;

你想设置“price”属性来引用函数本身，而不是调用它的返回值。

Answer 2

您最好将getPrice()声明为computer prototype的成员，如下所示：

var computer = function(speed, hdspace, ram)
{
    this.speed=speed;
    this.hdspace=hdspace;
    this.ram=ram;
    this.price=get_price();
}
computer.prototype = {
    get_price: function()
    {
        var the_price=500;
        the_price += (this.speed == "2GHz") ? 200 : 100;
        the_price += (this.hdspace == "80GB") ? 50 : 25;
        the_price += (this.ram == "1GB") ? 150 : 75;
        return the_price;
    }
}

Answer 3

你好吗？

问题在于价格不是一种功能，而是一种属性。

基本上是这样的：

var work_computer_price = work_computer.price;

会奏效。

干杯！

Javascript程序语法错误

3 个答案: