Returns a string value consisting of all the elements of an array concatenated together and separated by the specified separator string.
Required. An Array object.
Optional. A String object used to separate one element of an array from the next in the resulting String object. If omitted, the array elements are separated with a comma.
If any element of the array is undefined or null, it is treated as an empty string.
The following example illustrates the use of the join method.
var a, b;
a = new Array(0,1,2,3,4);
b = a.join("-");
Supported in the following document modes: Quirks, Internet Explorer 6 standards, Internet Explorer 7 standards, Internet Explorer 8 standards, Internet Explorer 9 standards. See Version Information.