改变数组对象的值

Question

这里是我的数组

Array1 = [{year: "2013", fruit: "banana", quantity: 1},{year: "2014", fruit: "orange", quantity: 1},{year: "2014", fruit: "banana", quantity: 2}] 

而我的功能来复制数组1：

var Array2 = Array1; 
for (var i = 0, len = Array1.length; i < len; i++) { 
    Array2[i] = Array1[i]; 
} 

但我想在数组2中的所有值我的钥匙改变“年”，并把值“AllYear”：

Array2 = [{year: "AllYear", fruit: "banana", quantity: 1},{year: "AllYear", fruit: "orange", quantity: 1},{year: "2014", fruit: "banana", quantity: 2}] 

Answer 1

使用map，但一定要返回一个新的对象：

var Array2 = Array1.map(function (el) { 
    return { fruit: el.fruit, year: 'AllYear', quantity: el.quantity } 
}); 

DEMO

Answer 2

// JS

var Array2 = Array1 
    for (var i = 0, len = Array1.length; i < len; i++) { 
    Array2[i].year = "AllYear"; 
} 

参考此解决方案：Jsfiddle

我希望这将有助于！

Answer 3

你可以像这样

Array2 = Array1.slice(0); //copy array1 elements to array2 
Array2 = Array2.map(function (el) { 
var copy = {}; 
for (var attr in el) { 
     if (el.hasOwnProperty(attr)) copy[attr] = el[attr]; 
    } 
    copy.year = 'AllYear'; 
    return copy ; 
}); 

Answer 4

var Array2 = Array1; 
$.each(Array2,function(index,value) { 
    value.year = "AllYear"; 
});//returns what you excepted