在 javascript 中创建和访问二维数组
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Creating and Accessing 2-dimensional arrays in javascript
提问by Komal Waseem
I'm confused about how to create and access 2-dimensional arrays in javascript. Below is an array declaration in which I'm storing names of people and then the src for their image. When I try to access myArray[0][0] element I get 'D' and when I try to access myArray[0,0], I get Donald Duck. How can I access the img src myArray[0][0] = "assets/scrybe.jpg" ?
我对如何在 javascript 中创建和访问二维数组感到困惑。下面是一个数组声明，我在其中存储人名，然后是他们图像的 src。当我尝试访问 myArray[0][0] 元素时，我得到“D”，当我尝试访问 myArray[0,0] 时，我得到唐老鸭。如何访问 img src myArray[0][0] = "assets/scrybe.jpg" ？
JS code:
JS代码：
var myArray = new Array(1);
myArray[0] = "Donald Duck";
myArray[1] = "Winnie Pooh";
myArray[2] = "Komal Waseem";
myArray[3] = "Hockey";
myArray[4] = "Basketball";
myArray[5] = "Shooting";
myArray[6] = "Mickey Mouse";
myArray[0][0] = "assets/scrybe.jpg";
myArray[1][0] = "assets/scrybe.jpg";
myArray[2][0] = "assets/scrybe.jpg";
myArray[3][0] = "assets/scrybe.jpg";
myArray[4][0] = "assets/scrybe.jpg";
myArray[5][0] = "assets/scrybe.jpg";
myArray[6][0] = "assets/scrybe.jpg";
回答by 0x499602D2
Firstly, to create an array, it's better to use the square bracket notation ( []):
首先，要创建数组，最好使用方括号表示法 ( [])：
var myArray = [];
This is the way you emulate a multi-demensional array in JavaScript. It's one or more arrays inside an array.
这是您在 JavaScript 中模拟多维数组的方式。它是一个数组中的一个或多个数组。
var myArray = [
[], [] // two arrays
];
If you're asking if there's a way to declare an array as multi-dimensional, then no, there isn't. You can access them like this:
如果您问是否有办法将数组声明为多维数组，那么不，没有。您可以像这样访问它们：
myArray[0][0]; // the 1st element of the first array in myArray
myArray[1][1]; // the 2nd element of the second array in myArray
Here is the code you were probably looking for:
这是您可能正在寻找的代码：
var myArray = [
["Donald Duck", "assets/scrybe.jpg"],
["Winnie Pooh", "assets/scrybe.jpg"],
["Komal Waseem", "assets/scrybe.jpg"]
[/* and so on...*/]
];
But since you're giving all the names the same URL, then you can use a forloop instead to do this faster:
但是由于您为所有名称提供了相同的 URL，因此您可以使用for循环来更快地执行此操作：
for (var i = 0; i < myArray.length; i++) {
myArray[i][1] = "assets/scrybe.jpg";
}
回答by Pointy
Perhaps what you really want is an array of objects:
也许你真正想要的是一个对象数组：
var myArrray = [
{ name: "Donald Duck", image: "assets/scrybe.jpg" },
{ name: "Winnie Pooh", image: "assets/scrybe.jpg" },
// ...
];
JavaScript doesn't really have 2-dimensional arrays, as such. What you can do is create an array such that each element is also an array.
JavaScript 并没有真正的二维数组。您可以做的是创建一个数组，使每个元素也是一个数组。
var twoDim = [ [], [], [], [], [] ];
In your case, however, I don't think that structure will help much.
但是，在您的情况下，我认为这种结构不会有太大帮助。
回答by sajawikio
No it cannot be done like that. Must either do:
不，不能那样做。必须这样做：
var myArray = new Array(1);
myArray[0] = new Array(1);
myArray[0][0] = "Donald Duck";
myArray[0][1] = "assets/scrybe.jpg";
Or use JS syntax
或者使用JS语法
var myJSObj = {"Donald" :"assets/scrybe.jpg", "Donald2": "assets/scrybe2.jpg" };
回答by Quentin Del
I had the same issues and I used minBy from Lodash
我遇到了同样的问题，我使用了 Lodash 的 minBy
https://lodash.com/docs/4.17.4#minBy
https://lodash.com/docs/4.17.4#minBy
var objects = [{ 'n': 1 }, { 'n': 2 }];
_.minBy(objects, function(o) { return o.n; });
// => { 'n': 1 }
// The `_.property` iteratee shorthand.
_.minBy(objects, 'n');
// => { 'n': 1 }
