JS数组排序的问题

var arr1 = new Array([1,2000,5,40,3]);var arr2 = new Array([1],[2000],[5],[40],[3]);var arr3 = new Array([1],[2],[5],[4],[3]);var arr4 = [1,2000,5,40,3];document.write(arr1.length+"<br/>");arr1.sort();document.write(arr1+"<br/>");document.write(arr2.length+"<br/>");arr2.sort();document.write(arr2+"<br/>");document.write(arr3.length+"<br/>");arr3.sort();document.write(arr3+"<br/>");document.write(arr4.length+"<br/>");arr4.sort(compareASC);document.write(arr4+"<br/>");function compareASC(a, b){return a - b;}

结果：

1

1,2000,5,40,3

5

1,2000,3,40,5

5

1,2,3,4,5

5
1,3,5,40,2000