var obj = {
  name: 'test',
  getName: function(){
     return function(){
      console.log(this.name);
    }
  }
}
obj.getName()

function aaa(){
  return function(){
    return console.log(123)
  }
}
aaa()()

function bbb(){
  var sum = [];
  for(var i =0; i<10; i++){
    sum[i] = function(sum){
     console.log(sum)
    }(i)
  }
}

bbb()