字符串轉數組，數組轉字符串

1、字符串轉換為數組
var string = '123,456,789';
var stringResult = string.split(',');
console.log(stringResult) //輸出["123", "456", "789"]
 
var string2 = 'abcdef'
var string2Result = string2.split('')
console.log(string2Result) //輸出['a','b','c','d','e','f']
string2.split(",").map(Number);//輸出[123,456,789]
JSON.parse("[" + string + "]"); //輸出[123,456,789]
 
2、數組轉換為字符串
var array = ['abc', 'def', 'hig']
var arrayResult = array.join(',')
console.log(arrayResult) // 輸出"abc,def,hig"
array.toString()//輸出"abc,def,hig"