function aaa(){
  var arr = [];
  for(var i = 0; i<10; i++){
    arr[i] = (function(sum){
      return console.log('元素：' + sum)
    })(i)
  }
  return arr
}

aaa()

function bbb(){
  var arr = [];
  for(var i =0;i<10; i++){
    arr[i] = function(n){
      return function(){
        return console.log('test:' + n)
      }
    }(i)
  }
  return arr
}

var cc = bbb();
for(var i =0; i<10; i++){
  cc[i]()
}