这个简单的JavaScript代码意味着什么 [英] What does this simple javascript code means

问题描述

  switch （提示（  Whatistheweatherlike？））
 
 
 {
  case    rainy：
  console  .log（< span class =code-string>  Remembertobringanumbrella。）; 
  break ; 
  case    sunny ：
  console  .log（  Dresslightly。 ）; 
  case   多云 ：
  console  .log（  Gooutside。 ）; 
  break ; 
 默认：
  console  .log（  Unknownweathertype！）; 
  break ; 
} 

我的问题是第一行是如何工作的？



开关（提示（Whatistheweatherlike？））



基本上，我们正在比较用户输入和打印消息。



通常，我们使用prompt（message，）;存储变量。我的问题是为什么我们在任何变量中存储存储值？

解决方案

switch语句基本上是一个if语句，不重复这个问题。



上面你的功能相当于：

  var  response =  switch （提示（  Whatistheweatherlike））？; 
 
  if （response == rainy）{
  console 。 log（  Remembertobringanumbrella。）; 
} 
  else   if （response ==   sunny）{
  console  .log（  Dresslightly。）; 
} 
  else   if （response ==  多云）{
  console  .log（  Gooutside。）; 
} 
  else  {
  console  .log（  Unknownweathertype！）; 
} 

好吧，

这很简单。

当你运行这个并且开关被击中，它会提示用户输入天气是什么样的？

javascript中的窗口提示符（）意味着窗口中的所有内容都会被提示对话框或对话框覆盖，提示用户根据问题输入确定和取消按钮，单击确定。 ，检查Case语句并记录输出消息。

根据用户输入的情况进行检查并在控制台日志中打印输出消息。

小提琴 [ ^ ]

请检查小提琴。

我希望这会有所帮助。

谢谢。:)

switch(prompt("Whatistheweatherlike?"))


{
case"rainy":
console.log("Remembertobringanumbrella.");
break;
case"sunny":
console.log("Dresslightly.");
case"cloudy":
console.log("Gooutside.");
break;
default:
console.log("Unknownweathertype!");
break;
}

My question is how the first line works?

switch(prompt("Whatistheweatherlike?"))

Basically, we are comparing user input and printing a message.

Usually, we use prompt("message",""); to store a variable. My question is why we havnt stored value in any variable?

解决方案

A switch statement is basically an if statement, that doesn't repeat the question.

What you have above is the functional equivalent of:

var response = switch(prompt("Whatistheweatherlike?"));

if(response == rainy) {
console.log("Remembertobringanumbrella.");
}
else if(response == "sunny") {
console.log("Dresslightly.");
}
else if(response == "cloudy") {
console.log("Gooutside.");
}
else {
console.log("Unknownweathertype!");
}

Well,
this is quite simple.
When you run this and switch gets hit, it prompts the user to input What the weather is like?
Window Prompt() in javascript means that everything in the window gets overboard by the prompt dialog or dialog, which asks the user to input based on the questions with a Ok and Cancel button, On click of Ok, the Case statements gets checked and the output message gets logged.
And based on the input by the user case is checked and output message is printed in the console log.
Fiddle[^]
Please check the fiddle also.
I hope this helps.
Thanks.:)

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