取数组值 拼接成字符串，逗号分割？

Question

var domains = arr["12.com","qw.com","99.com","00.com"];
var str="";
domains.forEach(function (item, index) {
str += item + ",";
});
怎么是它变成“"12.com","qw.com","99.com","00.com"”;

Answer 1

利用数组转字符串的函数，array.toString();

Answer 2

直接用Array.join()就可以了。

var domains = ["12.com","qw.com","99.com","00.com"];
var str = domains.join('，');
console.log(str);

Answer 3

["12.com","qw.com","99.com","00.com"].join(',');//"12.com,qw.com,99.com,00.com"

Answer 4

var domains = arr["12.com","qw.com","99.com","00.com"];
你这句有问题吧
我估计你想
var domains = ["12.com","qw.com","99.com","00.com"];