js中的数组的创建和遍历是最基本的；此处不需要笔记。
1.合并两个数组arr1.concat(arr2);
eg:
var arr = new Array(3)
arr[0] = "George"
arr[1] = "John"
arr[2] = "Martin"
var arr2 = new Array(3)
arr2[0] = "James"
arr2[1] = "Adrew"
arr2[2] = "Martin"
document.write(arr.concat(arr2))
2.数组转成字符串 arr.join(",");以“，”为分隔符转化成字符串。
3.文字数组的排序：arr.sort();从字面上对数组中的字符串进行排序。
4.数字数组的排序：arr.sort();从数值上对数组进行从小到大排序。
eg:
function sortNumber(a, b)
{return a - b}
var arr = new Array(6)
arr[0] = "10";arr[1] = "5";arr[2] = "40";arr[3] = "25";arr[4] = "1000";arr[5] = "1";
document.write(arr.sort(sortNumber))
