"如何将一组数字加入到 1 个串联数字中？"

Question

How do I join this array to give me expected output in as few steps as possible?

var x = [31,31,3,1]
//expected output: x = 313131;

Answer 1

Use array join<\/code> method. Join<\/code> joins the elements of an array into a string, and returns the string. The default separator is comma (,). Here the separator should be an empty string.

var  x = [31,31,3,1].join("");

Answer 2

Javascript join() will give you the expected output as string . If you want it as a number , do this:

var x = [31,31,3,1];
var xAsString = x.join(''); // Results in a string
var xAsNumber = Number(x.join('')); // Results in a number, you can also use +(x.join(''))

Answer 3

I can't think of anything other than

+Function.call.apply(String.prototype.concat, x)

Answer 4

Your question asks for a number, most of the answers above are going to give you a string. You want something like this.

Answer 5

Try join() as follows

Answer 6

Try below.

var x = [31,31,3,1]
var teststring = x.join("");

Answer 7

This will work

var x = [31,31,3,1];
var result = x.join("");