在javascript中对数字和null进行排序的数组

Question

I need some help to write sorting function for DataTables. I have a column that contains currency - numbers with positive and negative values as well as blanks.
I would like to have the nulls appear as last (/first) but they always come before the negative values. Could anybody hint me towards the solution?

Answer 1

提示是排序时将空值更改为Number.NEGATIVE_INFINITY或Number.POSITIVE_INFINITY

Answer 2

Given an array of numbers which also contains null , if you want to sort them and keep null at the end of the results, you can customize your sort function this way:

var num = [-22,55,30,0,0,null,350,null,10000,-20];

num.sort(function(a,b){
    if (b == null) return -1;
    else if (a==null) return 1;
    else return a > b
});

// [-22, -20, 0, 0, 30, 55, 350, 10000, null, null]

This example above treats null as the largest number so when sort the array, nulls come last (see the sort function). If you want the reverse order, you can make a modification to that customized sort function.