js实现对象数组化

var a={
name:'zhangsan',
age:23,
height:170
};
function obj_arr(obj){
var arr=[];
for(var k in obj){
 arr[k]=obj[k];
}
for(var k in  obj){
 console.log(k,arr[k]);
}
}
obj_arr(a);
console.log(typeof obj_arr(a));