function extend(destination,source){
    var toString = Object.prototype.toString,
        objTest = toString.call({});
    for( var property pertyin source) {
        if(source[property] && objTest == toString.call(source[pro])){
            destination[property] = destination[property] || {}
            extend(destination[property],source[property]);
        }else{
            destination[property] = source[property]
        }
    }
    return destination;
};