Create Globally Unique ID in JavaScript [duplicate]

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I’ve used this in the past. Collision odds should be very low.

var generateUid = function (separator) {
    /// <summary>
    ///    Creates a unique id for identification purposes.
    /// </summary>
    /// <param name="separator" type="String" optional="true">
    /// The optional separator for grouping the generated segmants: default "-".    
    /// </param>

    var delim = separator || "-";

    function S4() {
        return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
    }

    return (S4() + S4() + delim + S4() + delim + S4() + delim + S4() + delim + S4() + S4() + S4());
};

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