Create a string that s random

randomString.js

    /**
     * @param lng {Number}
     * @returns {string}
     * @constructor
     */
    function MakeId(lng) {
        var text = "";
        var possible = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789";

        for (var i = 0; i < lng; i++)
            text += possible.charAt(Math.floor(Math.random() * possible.length));

        return text;
    }