数值排序二维数组

Question

I am REALLY new at JS, and I am trying to sort this 2d array by the second value. I swapped the 1st and 2nd values around so I can use .sort(), but since it is supposed to be a number I used function(a, b){return a - b}. It still doesn't work.

function orderListItemQuantity(){
for (i=0;i<items.length; i++){
    var temp = items[i][0];
    items[i][0] = items[i][1];
    items[i][1] = temp;
}
items.sort(function(a, b){return a - b});
for (i=0;i<items.length; i++){
    var temp = items[i][0];
    items[i][0] = items[i][1];
    items[i][1] = temp;
}
refreshList();

}

Answer 1

Use the brackets notation to sort by the 2nd item (index 1) of each sub-array.

Example:

 var items = [[1, 3], [1, 1], [1, 2]]; items.sort(function(a, b) { return a[1] - b[1]; }); console.log(JSON.stringify(items));