返回JavaScript函数的变量值 [英] Return variable value of JavaScript function

问题描述

伙计们，我有一个JavaScript函数，该函数应返回带有值的Array.功能如下:

  let finalInput;让输入；函数getCorrectInput(输入，finalInput){输入=提示(键入客户端类型，后跟" +"semicollon和用逗号分隔的日期" +(以下为示例:奖励:31Dez2019(工作日)，2020年1月1日(工作日):")；while(输入===未定义||输入===空||输入===)){输入=提示(键入客户端类型，后跟" +"semicollon和用逗号分隔的日期" +(以下为示例:奖励:31Dez2019(工作日)，2020年1月1日(工作日):")；}如果(输入)返回finalInput = input.split('，');返回finalInput}getCorrectInput() 

基本上，该函数验证字段是否包含某些内容(如果用户键入了内容)，并在输入中返回内容.因此，该函数的输出应如下所示:

  finalInput = ["Reward"，"date1"，"date2"] 

我需要访问位置[0]的finalInput，并将其传递给变量，如下所示:

  const clientType = finalInput [0] 

但是当我尝试访问finalInput时，它返回一个错误，表明它无法读取未定义的属性0.因此，这意味着代码不会返回带有值的数组.

我做错了什么?

解决方案

这里的问题是您对输入变量的检查，当有用户输入时，表达式始终为true，并且将结果赋予不可达的语句，

因此，要解决此问题，您需要更改对"input"变量的检查，如下所示:

• if(input == null)

您还可以(y)

  let finalInput;让输入；函数getCorrectInput(输入，finalInput){输入=提示(键入客户端类型，后跟" +"semicollon和用逗号分隔的日期" +(以下为示例:奖励:31Dez2019(工作日)，2020年1月1日(工作日):")；while(输入===未定义||输入===空||输入===)){输入=提示(键入客户端类型，后跟" +"semicollon和用逗号分隔的日期" +(以下为示例:奖励:31Dez2019(工作日)，2020年1月1日(工作日):")；}如果(输入== null)返回finalInput = input.split('，');返回finalInput}//只需记录您的结果var结果= getCorrectInput()console.log(result) 

So guys, I have a JavaScript function that should return an Array with values. Here is the function:

let finalInput;
let input;
function getCorrectInput (input, finalInput) {
  input = prompt("Type the client type followed by" +
  "semicollon and the dates separated by comma"+
  "(Following the example: Reward: 31Dez2019(weekday), 01Jan2020(weekday)):");

  while (input === undefined || input === null || input === '') {
    input = prompt("Type the client type followed by" +
    "semicollon and the dates separated by comma"+
    "(Following the example: Reward: 31Dez2019(weekday), 01Jan2020(weekday)):");
  } 

  if (input) 
    return 

    finalInput = input.split(',');
  
  return finalInput
}

getCorrectInput()

Basically, the function verifies if the field contains something (if the user typed) and returns the content inside the input. So the output of the function should be something like that:

finalInput = ["Reward", "date1", "date2"]

I need to access the finalInput at position [0], and pass it to a variable, like that:

const clientType = finalInput[0]

But when I try to access the finalInput, it returns an error saying that it cannot read property 0 of undefined. So it means that the code is not returning the array with the values.

What am I doing wrong?

解决方案

The problem here is your check on the input variable, the expression is always true while there's a user entry, and it gives result to an unreachable statements,

So to solve this you need to change the check on the 'input' variable as follow :

• if( input == null )

And you are OK (y)

let finalInput;
let input;
function getCorrectInput (input, finalInput) {
  input = prompt("Type the client type followed by" +
  "semicollon and the dates separated by comma"+
  "(Following the example: Reward: 31Dez2019(weekday), 01Jan2020(weekday)):");

  while (input === undefined || input === null || input === '') {
    input = prompt("Type the client type followed by" +
    "semicollon and the dates separated by comma"+
    "(Following the example: Reward: 31Dez2019(weekday), 01Jan2020(weekday)):");
  } 

  if (input == null ) 
    return 

    finalInput = input.split(',');
  
  return finalInput
}
//Just to log your result
var result = getCorrectInput()
console.log(result )

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