function sortNum(a,b) {
return b-a;
}
var myarr = new Array("80","16","50","6","100","1");
document.write(myarr.sort(sortNum));
我理解下来，貌似默认的sort()是不能排序的，需要指定一种排序规则，就是function sortNum(a, b)
如果想升序排序，则return a-b;
如果想降序排列，则return b-a;