添加数组
var arr = [1,3,5];
arr.push(7);//从后面追加
console.log(arr);//输出1,3,5,7
arr.unshif(0);//从前面追加
console.log(arr);//输出0,1,3,5,7
console.log(arr.push(7));//注意：这里返回的是数组的长度 4
删除数组
var arr = [1,3,5,7,9,11];
arr.pop(3);//删除数组的最后一个11
console.log(arr);//1,3,5,7,9
arr.shift();//删除数组的第一个1
console.log(arr);//3,5,7,9,11
连接数组
var a = [1,2,3];
var b = ['a','b','c'];
a.concat(b);//结果[1,2,3,'a','b','c']
console.log(a.concat(b));
join将数组转化为字符串
join()方法:接收一个参数,即用作分隔符的字符串,然后返回包含所有数组项的字符串
var colors=["red","green","blue"];
alert(colors.join("||"));//red||green||blue
