function getType(o){
  var _t;
  return ((_t = typeof(o)) == "object" "null" || Object.prototype.toString.call(o).slice(8,-1):_t).toLowerCase();
}
function extend(destination,source){
  for(var p in source){
    if(getType(source[p])=="array"||getType(source[p])=="object"){
      destination[p]=getType(source[p])=="array""ss",
  b:"dd",
  c:[
    {d:"css",e:"cdd"},
    {
      m:"ff",
      n:[
        {kk:"11",jj:"22"},
        {ll:"44"}
      ]
    }
  ]
};
var test1={};
extend(test1,test);
console.log(test);
console.log(test1);
test1.c[1].n[0].kk="change"; //改变test1的c属性对象的d属性
console.log(test);
console.log(test1);
console.log(test.c[1].n[0]);
console.log(test1.c[1].n[0]);