javascript - 对象数组的复合排序(排序)

Question

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Answer 1

@emed 指向可能重复的链接，有一个有趣的解决方案。

我唯一的问题是性能，因为他在比较函数中不断地进行 map 和 reduce。

所以我做了一个稍微修改的版本，我还保留了反向排序的能力。

var objArray = [
    {
        ClassName: "Excel",
        Location: "Kansas City",
        StartDate: "2/1/2016",
        EndDate: "6/2/2016,"
    },
    {
        ClassName: "Outlook",
        Location: "Kansas City",
        StartDate: "1/1/2016",
        EndDate: "5/2/2016,"
    },
    {
        ClassName: "Excel",
        Location: "Kansas City",
        StartDate: "3/1/2016",
        EndDate: "7/2/2016,"
    }
];

objArray.sort(fieldSorter(['ClassName', 'StartDate']));
console.log(objArray);

function fieldSorter(fields) {
    var maps = [];
    fields.map(function (o) {
       var dir = +1;
       if (o[0] === '-') {
          dir = -1;
          o=o.substring(1);
       }
       maps.push({fn:o, dir:dir});
    });
    return function (a, b) {
       var ret = 0;
       maps.some(function (o) {
         if (a[o.fn] > b[o.fn]) ret = o.dir;
         else if (a[o.fn] < b[o.fn]) ret = -o.dir;
         else ret = 0;
         return ret !== 0;
       });
       return ret;
    };
}