Javascript 将元素添加到数组关联数组
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Add element to array associative arrays
提问by Dennis G
Allexamplesof adding new elements to associative arrays are going the "easy" way and just have a one dimensional array - my problem of understanding is having arrays within arrays (or is it objects in arrays?).
将新元素添加到关联数组的所有示例都采用“简单”的方式，并且只有一个一维数组 - 我的理解问题是在数组中包含数组（或者它是数组中的对象？）。
I have the following array:
我有以下数组：
var test = [
{
value: "FirstVal",
label: "My Label 1"
},
{
value: "SecondVal",
label: "My Label 2"
}
];
Two questions: How to generate this array of associative arrays (yes... object) from scratch? How to add a new elementto an existing array?
两个问题：如何从头开始生成这个关联数组（是...对象）的数组？如何向现有数组添加新元素？
Thanks for helping me understand javascript.
感谢您帮助我理解 javascript。
回答by James Montagne
I'm not exactly sure what you mean by "from scratch", but this would work:
我不太确定你所说的“从头开始”是什么意思，但这行得通：
var test = []; // new array
test.push({
value: "FirstVal",
label: "My Label 1"
}); // add a new object
test.push({
value: "SecondVal",
label: "My Label 2"
}); // add a new object
Though the syntax you posted is a perfectly valid way of creating it "from scratch".
尽管您发布的语法是“从头开始”创建它的完全有效的方式。
And adding a new element would work the same way test.push({..something...});.
添加新元素的工作方式相同test.push({..something...});。
回答by SLaks
This is an array of objects.
这是一个对象数组。
You can put more objects in it by calling test.push({ ... })
您可以通过调用将更多对象放入其中 test.push({ ... })
回答by Diode
var items = [{name:"name1", data:"data1"},
{name:"name2", data:"data2"},
{name:"name3", data:"data3"},
{name:"name4", data:"data4"},
{name:"name5", data:"data5"}]
var test = [];
for(var i = 0; i < items.length; i++){
var item = {};
item.label = items[i].name;
item.value = items[i].data;
test.push(item);
}
makes testequal to
使测试等于
[{label:"name1", value:"data1"},
{label:"name2", value:"data2"},
{label:"name3", value:"data3"},
{label:"name4", value:"data4"},
{label:"name5", value:"data5"}]
回答by Rob W
From scratch, the following lines will create an populate an array with objects, using the Array.prototype.pushmethod:
从头开始，以下几行将使用该Array.prototype.push方法创建一个包含对象的数组：
var test = []; // Create an array
var obj = {}; // Create an object
obj.value = "FirstVal"; // Add values, etc.
test.push(obj);
