Extjs4获取form组装url参数

/**
 * takes an array of form values and converts them into a
 * query string
 * 
 * @param {object} Ext.form
 * @return {string} 
 */
this.serialize_form_values = function(form)
{
    var serial = '',
        values = form.getValues();

    for(var value in values)
        serial += '&' + value + '=' + values[value];

    return serial.substr(1);
};