更改数组中每个项目的属性? [英] Change properties of every item in an array?

问题描述

我需要设置该数组中每个项目的值，向上计数.

I need to set the value of every item in this array, counting up.

例如，path [0] .value = 1，path [1] .value = 2等等...

So, for example, path[0].value = 1, path[1].value = 2 etc...

我正在寻找最有效的方法.

I'm looking for the most efficient way to do this.

我认为for循环是最好的方法，但是我想学习其他方法.可以使用map()方法或forEach()完成吗?声明中的...呢?我想用纯JS做到这一点，但是如果您可以用jQuery教我一种更好的方法，我也很想学习.

I think a for loop is the best way, but I want to learn other ways. Can it be done with the map() method or forEach()? What about a for... in statement? I'd like to do it with pure JS, but if you can teach me a better way with jQuery, I'd be interested to learn that too.

先谢谢了.

function Cell(x,y){
    this.xCoordinate = x;
    this.yCoordinate = y;
    this.value;
}
var path = [new Cell(0,0), new Cell(0,1), new Cell(0,2)];

推荐答案

您可以使用for循环或forEach:

for(var i=0; i<path.length; ++i)
  path[i].value = i+1;

path.forEach(function(cell, i) {
  cell.value = i + 1;
});

由于为什么在数组迭代中使用"for…in"这样的好主意，所以最好避免使用for...in?

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