从javascript数组中删除逗号

Question

I have 3 strings "a","b","c" in javascript array "testarray".

var testarray=new Array("a","b","c");

and then I am printing the value of testarray using javascript alert box.

alert(testarray);

The result will be like a,b,c

All these strings are separated by "," character. I want to replace this "," with some other character or combination of two or more characters so that the alert box will show something like a%b%c or a%$b%$c

Answer 1

Use the join method :

alert(testarray.join("%")); // 'a%b%c'

Here's a working example . Note that by passing the empty string to join you can get the concatenation of all elements of the array:

alert(testarray.join("")); // 'abc'

---

Side note : it's generally considered better practice to use an array literal instead of the Array constructor when creating an array:

var testarray = ["a", "b", "c"];

Answer 2

use testarray is getting converted in string using testarray.toString() before alert. toString internally joining these items using ',' as separator. you can convert it into string using Array.join and pass own separator.

alert(testarray.join("%"));

Answer 3

you can iterate through the array and insert your characters

var testarray=new Array("a","b","c");
var str;
for (var i = 0; i < testarray.length; i++) {
  str+=testarray[i]+"%";
}
alert(str);

Answer 4

join method is great, just to supplement that you can add array[0]+array[1]+array[2] only if the number of items is very small.

Also don't forget to put the value to "" in case of javascript array assign "undefined" automatically. People may get a problem without doing that.