javascript - 使用构造函数在对象内部创建对象

Question

在下面的代码中，我尝试创建一个名为“portfolio”的对象，其中我想创建包含属性“stockvalue”和“price”的其他对象？

var portfolio_create = function(stock,stockvalue,price)
{
    for(i in stock)
    {
        this[stock[i]] = stock[i];
        this[stock[i]]["stockvalue"] =stockvalue[i];
        this[stock[i]]["price"]=price[i]    
    }
}

var portfolio = new portfolio_create(["ibm","tcs"],[23,34],[34,45]);

var stock_market = portfolio;


alert(portfolio["ibm"]["stockvalue"]);  // undefined

为什么警报返回“未定义”而不是 23？

提前致谢。

Answer 1

var portfolio_create = function (stock, stockvalue, price) {

    for (var i = 0, len = stock.length; i < len; i++) {
        this[stock[i]] = {};

        this[stock[i]]["stockvalue"] = stockvalue[i];
        this[stock[i]]["price"]      = price[i];    
    }
}
var portfolio = new portfolio_create(["ibm", "tcs"], [23,34], [34,45]);

1. 不要对数组使用for..in。
2. this[stock[i]] = stock[i]; 替换为 this[stock[i]] = {};。

Example