~~~ <script> var arr = [33,22,1,4,6,88,77]; var copyArr = [...arr]; // var d = arr.sort(function(a,b){ // return a-b; //从小到大 // }); var d = arr.sort(function(a,b){ return b-a; }) var e = copyArr.sort((a,b)=>a-b); console.log(d); console.log(e); </script> ~~~