Javascript 对象数组排序返回明显随机的结果

Question

我正在尝试对对象数组进行简单排序，但它似乎返回完全随机的结果。请看看这个 plunk:(在 FF 或 Chrome 中)

http://plnkr.co/edit/TqoyUJV4nzvC4hAkVRkz?p=preview

    var data;
    var asc;

    function init(){
        data = [{username:"leonhaas"},{username:"0johnson"},{username:"leonlang"},{username:"0lechner"},{username:"0koller"},{username:"leonwinkler"},{username:"0schmidt"},{username:"0mueller"},{username:"0schmid"},{username:"lillyfuchs"},{username:"alexandragruber"},{username:"alexanderlechner"},{username:"alexanderpichler"},{username:"alexandraeder"},{username:"lillyreiter"},{username:"alibauer"},{username:"alexandrahall"},{username:"alexandrajohnson"},{username:"alexandrataylor"},{username:"alexandrawilliams"},{username:"lilywinkler"},{username:"alinabauer"},{username:"aliceegger"},{username:"alicesteiner"},{username:"alicewallner"},{username:"aliegger"},{username:"alifuchs"},{username:"linajohnson"},{username:"amarwhite"},{username:"alinaleitner"},{username:"alinaschmidt"},{username:"alinawood"},{username:"alischneider"}];
        outputData(data);
        asc = true;
    }

    function sortIt()
    {
        a = data.username;
        b = data.username;
        if(asc){
            data.sort(function(a,b)
            {
                return 1;
            });
        } else {
            data.sort(function(a,b)
            {
                return -1;
            });
        }

        outputData(data);
    }

    function outputData(data){
        var output = "";
        data.forEach(function (item){
            output += item.username +"<br>";
        });

        var x=document.getElementById("demo");
        x.innerHTML=output;
    }

Answer 1

在排序函数中，您必须比较数据对象的用户名:

function sortIt()
{
    if(asc){
        data.sort(function(a,b)
        {
            return a.username.localeCompare(b.username);
        });
    } else {
        data.sort(function(a,b)
        {
            return b.username.localeCompare(a.username);
        });
    }

    outputData(data);
}