了解下面的javascript函数和流程

makeAddFunction（）

是一个返回新创建函数的函数。结果取决于传递给

makeAddFunction（）

的

amount

参数

编写

makeAddFunction（5）

时，解释器会记住给定上下文中的

amount

，因此生成的函数相当于：

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

---

有一些javascript代码。你有什么问题吗？@AlexWayne你能逐行解释代码吗？我真的很困惑。哪一行让你困惑？你得到了哪一部分，你没有得到哪一部分？编辑您的问题并添加一些文本，更详细地描述您希望从答案中得到什么。试着理解它，至少是一点，然后问一个关于你没有理解的特定部分的问题。@AlexWayne，主要是，对最后三行感到困惑。谢谢：）除了这三行之外，我什么都懂了。addTwo和addFive函数如何知道做“number”+2；我编辑了答案。现在应该清楚了，谢谢。是的。我感谢你详细解释。我是新来的。所以return关键字和在屏幕上打印是一样的吗？比如console.log？或者return只获取值并保存它。你推荐的关于如何像软件工程师一样思考的任何材料。开始编码前要做什么？什么都可以。

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

function add(number){
    return number + 5;
}