Javascript程序語法錯誤

Question

我有一個語法錯誤，我不知道如何解決。這是代碼：

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); 

第22行，有一個錯誤說：遺漏的類型錯誤：對象＃的特性「價格」是不是函數 這是第22行：

var work_computer_price = work_computer.price(); 

請幫幫我。謝謝！

Answer 1

當你將this.price拿走括號：

this.price=get_price; 

你要設置的「價格」屬性引用函數本身，而不是調用它的返回值。

Answer 2

你好嗎？

的問題是，價格不是一個函數，它的屬性。

所以基本上：

var work_computer_price = work_computer.price; 

會工作。

乾杯！

Answer 3

你更好的聲明getPrice()爲computer的prototype，像這樣的成員：

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; 
    } 
}