js中如何对json数组进行排序

// 升序排列
function up(a, b) {
     return a.val-b.val
 },
 // 降序排列
function down(a, b) {
    return b.val-a.val
},

// sort 会直接对原数据排序
testJson.sort(up)

let test=[{"val":100},{"val":70},{"val":50},{"val":20},{"val":10}]
test=test.sort(up)

let newArray = [
      {product: "1", matno: "420200011480006",salebillno:"xsdd2733-8", sales: "800"},
      {product: "2", matno: "420200011480007",salebillno:"xsdd2733-2", sales: "300"},
      {product: "3", matno: "420200011480006",salebillno:"xsdd2733-5", sales: "100"},
      {product: "4", matno: "420200011480006",salebillno:"xsdd2733-3", sales: "200"},
      {product: "5", matno: "420200011480008",salebillno:"xsdd2738", sales: "600"},
      {product: "6", matno: "420200011480010",salebillno:"xsdd2734", sales: "400"},
      {product: "7", matno: "420200011480009",salebillno:"xsdd2735", sales: "700"},
      {product: "8", matno: "420200011480001",salebillno:"xsdd2737", sales: "500"}
     ]
     
 

 
function sortByArr(arr, rev) {
 if (rev == undefined) {
 rev = 1;
 } else {
 rev = (rev) ? 1 : -1;
 }
 return function(a, b) {
 for (var i = 0; i < arr.length; i++) {
 let attr = arr[i]
 if (a[attr] != b[attr]) {
 if (a[attr] > b[attr]) {
 return rev * 1;
 } else {
 return rev * -1;
 }
 }
 }
}
}

 newArray.sort(sortByArr(['matno','salebillno'],true))
[{product: '8', matno: '420200011480001', salebillno: 'xsdd2737', sales: '500'}
 {product: '4', matno: '420200011480006', salebillno: 'xsdd2733-3', sales: '200'}
 {product: '3', matno: '420200011480006', salebillno: 'xsdd2733-5', sales: '100'}
 {product: '1', matno: '420200011480006', salebillno: 'xsdd2733-8', sales: '800'}
 {product: '2', matno: '420200011480007', salebillno: 'xsdd2733-2', sales: '300'}
 {product: '5', matno: '420200011480008', salebillno: 'xsdd2738', sales: '600'}
 {product: '7', matno: '420200011480009', salebillno: 'xsdd2735', sales: '700'}
 {product: '6', matno: '420200011480010', salebillno: 'xsdd2734', sales: '400'}]

newArray.sort(sortByArr(['matno'],false))
// 输出
[{product: '6', matno: '420200011480010', salebillno: 'xsdd2734', sales: '400'}
 {product: '7', matno: '420200011480009', salebillno: 'xsdd2735', sales: '700'}
 {product: '5', matno: '420200011480008', salebillno: 'xsdd2738', sales: '600'}
 {product: '2', matno: '420200011480007', salebillno: 'xsdd2733-2', sales: '300'}
 {product: '1', matno: '420200011480006', salebillno: 'xsdd2733-8', sales: '800'}
 {product: '3', matno: '420200011480006', salebillno: 'xsdd2733-5', sales: '100'}
 {product: '4', matno: '420200011480006', salebillno: 'xsdd2733-3', sales: '200'}
 {product: '8', matno: '420200011480001', salebillno: 'xsdd2737', sales: '500'}]