Javascript 声明包含对象的对象数组
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Declare array of objects containing objects
提问by myforwik
I have an array of objects that contain other objects. At the moment the way I declare them is pretty long winded. Is there are more condense way to do the following:
我有一个包含其他对象的对象数组。目前，我声明它们的方式非常冗长。是否有更简洁的方法来执行以下操作：
function city(name,population)
{
this.name = name;
this.population = population;
}
function state(name)
{
this.name= name;
this.cities = new Array();
}
function country(name)
{
this.name= name;
this.states = new Array();
}
Countries = new Array();
Countries[0] = new Country("USA");
Countries[0].states[0] = new State("NH");
Countries[0].states[0].cities[0] = new city("Concord",12345);
Countries[0].states[0].cities[1] = new city("Foo", 456);
...
Countries[3].states[6].cities[35] = new city("blah", 345);
Is there a way to declare this setup that isn't so verbose, something similair to how an xml would be layed out, something like:
有没有办法声明这个设置不是那么冗长，类似于 xml 的布局方式，例如：
data =
usa
NH
concord: 34253
foo: 3423
blah: 99523
NC
place: 23522
Uk
foo
bar: 35929
yah: 3452
I can't figure out how to nest array declarations without having to constantly repeat the variable names.
我无法弄清楚如何在不必不断重复变量名称的情况下嵌套数组声明。
回答by slebetman
Use object and array literals:
使用对象和数组文字：
var data = {
usa : {
NH : {
concord: 34253,
foo: 3423,
blah: 99523
},
NC : {
place: 23522
}
},
uk : {
foo : {
bar: 35929,
yah: 3452
}
}
}
Or something that reflects your original code more directly:
或者更直接地反映您的原始代码的内容：
var Countries = [
{
name : 'USA',
states : [
{
name : 'NH',
cities : [
{
name : 'Concord',
population : 12345
},
{
name : "Foo",
population : 456
}
/* etc .. */
]
}
]
},
{
name : 'UK',
states : [ /* etc... */ ]
}
]
Note: In javascript, var foo = []is exactly equivalent to (and the preferred way to write) var foo = new Array(). Also, var foo = {}is the same as var foo = new Object().
注意：在 javascript 中，var foo = []完全等同于（以及首选的编写方式）var foo = new Array()。此外，var foo = {}与var foo = new Object().
Note: Don't forget to add commas between separate sub-objects.
注意：不要忘记在单独的子对象之间添加逗号。
回答by syockit
Would this be good enough for you?
这对你来说足够好吗？
var data = [
{ name: "USA",
states: [
{ name: "NH",
cities: [
{ name: "concord", population: 34253 },
{ name: "foo", population: 3423 },
{ name: "blah", population: 99523 }
]
},
{ name: "NC",
cities: [
{ name: "place", population: 23522 }
]
}
]
},
{
name: "UK",
states: [
{ name: "foo",
cities: [
{ name: "bar", population: 35929 },
{ name: "yah", population: 3452 }
]
}
]
}
]
回答by Scott Evernden
data = {
usa: {
NH: {
concord: 34253,
foo: 3423,
blah: 99845
}
uk: {
foo: {
bar: 3454,
yah: 33457
}
}
}
}
}
