这道题面试前端，没人答出来！

根据输出结果，用递归写出方法printAll

var user = {
    username: "lilei",
    phone: "158",
    description: "i am a boy",
    like: {
        movie: "homeland",
        game: "cs",
        sport:"basketball"
    }
};
printAll(user);
输出：

username:lilei
phone:158
description:i am a boy
movie:homeland
game:cs
sport:basketball

function printAll(s){
 for(var i in s){
  if(typeof s[i]=="object"){
   printAll(s[i])
  }else{
　　　console.log(i+":"+s[i]);
　　}
 }
}