A simple javascript object to read and manipulate the query string

simple-javascript-query-string.js

var queryString = function(queryStr) {
    this._query = [];

    queryStr = queryStr || window.location.search.substr(1);

    var pairs = queryStr.split("&");
    for(var i in pairs) {
        var keyval = pairs[i].split("=");
        this._query[keyval[0]] = keyval[1];
    }

    return this;
};

queryString.prototype.get = function(key) {
    return this._query[key];
};

queryString.prototype.set = function(key, value) {
    this._query[key] = value;
    return this;
};

queryString.prototype.getURL = function() {
    var str = [];
    for(var i in this._query) {
        str.push(i + '=' + this._query[i]);
    }
    return window.location.href.split('?')[0] + '?' + str.join('&');
};

queryString.prototype.navigate = function(without_history) {
    if(without_history) {
        window.location.replace(this.getURL());
    } else {
        window.location.href = this.getURL();
    }
};