split,join,slice,splice_join split

1. 数组转字符

var a, b;
a = [0,1,2,3,4];
b = a.join("-");      //"0-1-2-3-4"
1
2
3

2. 字符串转数组

var str = "aaa,bbb,ccc";
strArr = str.split(",");// 在每个逗号(,)处进行分解  ["aaa", "bbb", "ccc"]
var hello = "helloworld";
helloArr = hello.split('');  //["h", "e", "l", "l", "o", "w", "o", "r", "l", "d"]
1
2
3
4

4. 截取

let day = [1,2,4,5]
day.slice(0, -1)  // [1, 2, 4]   去掉了最后一个
1
2

5. 删除

let array = [1, 2, 3]
array.splice(index, 1)  //index是下标，1是长度  array.splice(1, 1) 就得到[1,3]！！！！！！！！！！！！！！！对原数组进行了修改
1
2