Splitting string array of one value fails

I have this:

var ID= "12,32,23,78";

var i = ID.split(',');

If I do this then it works fine, but when it is only one value like 12, then it gives me 0. How I can solve this issue? If I need to check for开发者_如何转开发 only one value, how do you do that?

If the variable "ID" is the number 12, then of course it doesn't work — the .split() method is a method for strings, not numbers. Try this:

var ID = /* whatever */;

var i = (ID + '').split(',');

var i;
if (ID.indexOf(",") != -1)
    i = ID.split(',');
else
    i = ID;

Exactly like what you posted except you check for the presence of the seperator with JavaScripts .indexOf() string method.

    var ID= "12,32,23,78";

    var i = ID.split(',');

    will return [12,32,23,78]

    var ID= "12";

    var i = ID.split(',');

    will return [12] -- this is also an array

however you may do this

    var ID= "12";

    var i = ID.split(',') || ID;

String.prototype.mySplit = function(sep) {
    return (this.indexOf(sep) != -1) ? this.split(sep) : [this];
};

Example:

//var ID= '12,32,23,78';
var ID= '12';

//Update
if (typeof(ID)=='number') ID += '';

var i = ID.mySplit(',');

alert(i[0]);