Question

编写一个带n和函数f的函数，并返回一个函数g。

当你调用g（）时，它最多调用f（）n次。

离。

function log() {
  console.log('called log');
}
var onlyLog = only(3, log);
onlyLog(); -> outputs 'called log' to console
onlyLog(); -> outputs 'called log' to console
onlyLog(); -> outputs 'called log' to console
onlyLog(); -> does nothing
onlyLog(); -> does nothing

我的代码如下：

toolbox.only = function(n, f) {
  for (var i = 0; i <= n; i++) {
    var called = false;
    return function() {
      if (!called) {
        f();
        called = true;
      }
    }
  }
}

我的代码未通过以下测试：仅调用（3，f）超过3次应调用f（）3次。

提前感谢任何帮助。

Answer 1

我认为你在想这个问题..

请尝试以下方法..

// Write a function that takes a number n and a function f, and returns a function g.
// When you call g() it calls f() at most n times.

// ex.
//  function log() {
//    console.log('called log');
//  }
//  var onlyLog = only(3, log);
//  onlyLog(); -> outputs 'called log' to console
//  onlyLog(); -> outputs 'called log' to console
//  onlyLog(); -> outputs 'called log' to console
//  onlyLog(); -> does nothing
//  onlyLog(); -> does nothing

var only = function(n, f) {
  return function () {
    if (n) {
      n --;
      f();
    }
  }
}

function log() {
  console.log('called log');
}
var onlyLog = only(3, log);
onlyLog();// -> outputs 'called log' to console
onlyLog();// -> outputs 'called log' to console
onlyLog();// -> outputs 'called log' to console
onlyLog();// -> does nothing
onlyLog();// -> does nothing

JS代码无法解决

1 个答案: