在Javascript中如何在域名后添加字符串？

var domain = "example.com";
var str = "string to add";
var newUrl = domain + "/" + str;
console.log(newUrl);

example.com/string to add

var domain = "example.com";
var str = "string to add";
var newUrl = domain.concat("/", str);
console.log(newUrl);

example.com/string to add