Question

function makeAddFunction(amount) {

  function add(number) {

    return number + amount;


  }

  return add;

}

var addTwo = makeAddFunction(2);

var addFive = makeAddFunction(5);

show(addTwo(1) + addFive(1));

Answer 1

makeAddFunction()是一个返回新创建的函数的函数。结果取决于传递给amount的{{1}}参数。

makeAddFunction()

当您编写function makeAddFunction(amount) { function add(number) {/* We define a function add() that takes 1 argument return number + amount;//The function returns our "number" argument plus some "amount", determined by what's passed to makeAddFunction(). At this stage, you can think of "amount" as a fixed number. */ } return add;//We return the add() function, which takes the "number" argument } var addTwo = makeAddFunction(2);/*We create a function that takes "number" and returns "number" + 2. The returned function is exactly the same as: function(number){return number + 2;} */ var addFive = makeAddFunction(5);/*We create a function that takes "number" and returns "number" + 5. The returned function is exactly the same as: function(number){return number + 2;) */ show(addTwo(1) + addFive(1));//The result is (1 + 2) + (1 + 5) = 9时，解释程序会记住给定上下文中makeAddFunction(5)的内容，因此生成的函数等效于：

amount

了解下面的javascript函数并处理

1 个答案: