如何解决这个家庭作业逻辑？

这是我的挑战:

编写一个函数,它接受一个字符串输入并返回一个函数.返回的函数应该一次打印一个字符串的字符并循环.

var xyz = MyFunction('xyz');
xyz(); // should return 'x' on this first call
xyz(); // should return 'y' on this second call
xyz(); // should return 'z' on this third call
xyz(); // should return 'x' again on this fourth call

window.Onload= function() {
  var xyz = 'xzy';
  myFunction(xyz);
}

function myFunction(xyz) {
  var text = xyz;
  var arr = text.split('');
  var i;
  for (i = 0; i 





1> Keith..：
问题永远不会要求生成器,但Javascript很容易创建一个返回函数的函数,添加到此可以使用闭包来捕获状态.

例如.



function MyFunction (input) {
  var char_pos = 0;
  return function () {
    return input[char_pos++ % input.length];
  }
}


var xyz = MyFunction('xyz');
console.log(xyz()); // should return 'x' on this first call
console.log(xyz()); // should return 'y' on this second call
console.log(xyz()); // should return 'z' on this third call
console.log(xyz()); // should return 'x' again on this fourth call