Javascript 在javascript中将坐标存储在数组中
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storing coordinates in array in javascript
提问by Sara
I want to store coordinates into an array in javascript, I am new to javascript and do not have an idea how to do it.
我想在 javascript 中将坐标存储到一个数组中，我是 javascript 新手，不知道该怎么做。
Any help would be appreciated.
任何帮助，将不胜感激。
回答by jfriend00
There are a number of ways to store x,y coordinates:
有多种存储 x,y 坐标的方法：
Option 1 (every other index in an array):
选项 1（数组中的所有其他索引）：
function storeCoordinate(x, y, array) {
array.push(x);
array.push(y);
}
var coords = [];
storeCoordinate(3, 5, coords);
storeCoordinate(19, 1000, coords);
storeCoordinate(-300, 4578, coords);
coords[0] == 3 // x value (even indexes)
coords[1] == 5 // y value (odd indexes)
// to loop through coordinate values
for (var i = 0; i < coords.length; i+=2) {
var x = coords[i];
var y = coords[i+1];
}
Option 2 (simple object in an array):
选项 2（数组中的简单对象）：
function storeCoordinate(xVal, yVal, array) {
array.push({x: xVal, y: yVal});
}
var coords = [];
storeCoordinate(3, 5, coords);
storeCoordinate(19, 1000, coords);
storeCoordinate(-300, 4578, coords);
coords[0].x == 3 // x value
coords[0].y == 5 // y value
// to loop through coordinate values
for (var i = 0; i < coords.length; i++) {
var x = coords[i].x;
var y = coords[i].y;
}
回答by Dorpsidioot
Well, let's say we make it simple, you want to store co?rdinates, so we have x and y:
好吧，假设我们简单点，你想存储坐标，所以我们有 x 和 y：
function coordinate(x, y) {
this.x = x;
this.y = y;
}
This is how you create Objects in javascript, they act like functions. With this function you can create your coordinates. Then all you need to do is create an array:
这就是您在 javascript 中创建对象的方式，它们的作用类似于函数。使用此功能，您可以创建坐标。然后你需要做的就是创建一个数组：
var arr = new Array();
arr.push(new coordinate(10, 0));
arr.push(new coordinate(0, 11));
That's it basically
基本上就是这样
回答by Wes
These answers are not usable if you're trying to store a grid/matrix that you wanted to access data point by x,y values later.
如果您尝试存储稍后要通过 x,y 值访问数据点的网格/矩阵，这些答案将不可用。
var coords = [];
for(y=0; y < rows; y++){
for(x=0;x<cols; x++){
if(typeof coords[x] == 'undefined']){
coords[x] = [];
}
coords[x][y] = someValue;
}
}
//accessible via coords[x][y] later
回答by Swapnil
The push method would do the job:
push 方法可以完成这项工作：
var arr = new Array();
arr.push({ x : x_coordinate, y : y_coordinate });
var arr = new Array();
arr.push({ x : x_coordinate, y : y_coordinate });
You can then access them by using
然后，您可以通过使用访问它们
arr[0].x(gives the x coordinate)
arr[0].x（给出 x 坐标）
and
和
arr[0].y(gives the y coordinate).
arr[0].y（给出 y 坐标）。
Hope it helps.
希望能帮助到你。
