数组对象排序

sortFun (attr,rev){
       //第二个参数没有传递 默认升序排列
       if(rev ==  undefined){
           rev = 1;
      }else{
           rev = (rev) ? 1 : -1;
      }
       return function(a,b){
           a = a[attr];
           b = b[attr];
           if(a < b){
               return rev _ -1;
          }
           if(a > b){
               return rev _ 1;
          }
           return 0;
      }
},
let arr=[
    {
        name:`一`,
        number:1,
    },
    {
        name:`二`,
        number:2,
    }
]
arr.sort(this.sortFun(`number`))

var sdts = [
  {name:"小明",age:10},
  {name:"小红",age:20},
  {name:"小花",age:40},
  {name:"小明",age:10},
  {name:"小红",age:20},
  {name:"小明",age:10},
  {name:"小红",age:20},
  {name:"小花",age:40},
  {name:"小明",age:10},
  {name:"小红",age:20},
  {name:"小花",age:40},
];
function compare(property,desc) {
  return function (a, b) {
    var value1 = a[property];
    var value2 = b[property];
    if(desc==true){
      // 升序排列
      return value1 - value2;
    }else{
      // 降序排列
      return value2 - value1;
    }
  }
}
// console.log(sdts.sort(compare("age",true)))
console.log(sdts.sort(compare("age",false)))