1、添加元素

函數：push(para)，參數說明para要添加的元素

示例：

var lang = ["php","java","javascript"];

lang.push('.net');

結果：lang = ["php","java","javascript",".net"];

2、刪除和替換元素

函數：splice(para1,para2,para3)，參數說明para1其實位置（從0開始），para2要刪除的元素個數，para3（可選）要替換的元素

示例：

a、刪除

var lang = ["php","java","javascript"];

lang.splice(0,1);

結果：lang = ["java","javascript",".net"];

b、替換

var lang = ["php","java","javascript"];

lang.splice(0,1,'.net');

結果：lang = [".net","javascript",".net"];