javascript - JavaScript遍历数组，将price属性乘以2

我试图在下面的amusementRides函数中遍历doublePrices，将价格乘以2，但没有任何回报。我想念什么？

var amusementRides = [
   {
      id:'A1',
      name:'superman',
      price:12,
      opening_dates:[
         'Monday',
         'Tuesday',
         'Wednesday',
         'Thursday',
         'Friday',
         'Saturday',
         'Sunday'
      ],
      children_access:false
   },
   {
      id:'A2',
      name:'raging bull',
      price:10,
      opening_dates:[
         'Saturday',
         'Sunday'
      ],
      children_access:false
   },
   {
      id:'A3',
      name:'teacups',
      price:7,
      opening_dates:[
         'Friday',
         'Saturday',
         'Sunday'
      ],
      children_access:true
   }
];

// Define variable
var amusementRidesDouble = doublePrices(amusementRides);

// Define function to multiply price by 2
function doublePrices(amusementRides) {

    for (var price in amusementRides) {
        if amusementRides.hasOwnProperty(price) {
            alert (price *= 2);
    }
}
}

console.log(amusementRidesDouble);

提前致谢！

最佳答案

您可以使用数组的映射功能并更新必填字段

function doublePrices(amusementRides) {
    amusementRidesdouble = amusementRides.map(function(item){
        item.price = 2 * item.price;
        return item;
   })
   return amusementRidesdouble;

}