merge javascript Object

  <script type="text/javascript">
  <!--
/**merge javascript Object*/
function mergeObj(obj1,obj2){
  for(var key in obj2){
  obj1[key]=obj2[key]
  }
  return obj1;
}



var a ={'a1':'a11','a2':'a22'},b={'b1':'b11','b2':'b22'};
    var a3 = mergeObj(a,b);

var t =[];
for (x in a3 )
{
t.push('\n'+x+'='+a3[x])
}
alert('222:'+t.join())




  //-->
  </script>