day28 对象

对象的枚举

 var arr = [1,2,3,4,5,6,7,8,9];
 for( var i = 0; i < arr.length; i ++){
        console.log(arr[i]);
 }遍历对象 prop[xxxxx]
  var obj = {
	 name : "123",
	 age : "456",
	 sex : 'male'
 }
      for(var prop in obj){
      console.log(prop + " "  + typeof(prop));
      console.log(obj[prop]);
 }