Adds all the elements of an array separated by the specified separator string.
Syntax
arrayObj.join([separator])
Parameters
arrayObj
Required. An Array object.
separator
Optional. A string used to separate one element of an array from the next in the resulting String. If omitted, the array elements are separated with a comma.
Remarks
If any element of the array is undefined or null, it is treated as an empty string.
Example
The following example illustrates the use of the join method.
var a, b;
a = new Array(0,1,2,3,4);
b = a.join("-");
document.write(b);
// Output:
// 0-1-2-3-4
Requirements
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards, Internet Explorer 10 standards, Internet Explorer 11 standards. Also supported Store apps (Windows 8 and Windows Phone 8.1). See Version Information.