javascript - 如何将我的答案写在变量中？

Question

我在动态编写代码时遇到问题。我正在学习 JavaScript 编程类(class)，但我在完成一项作业的最后部分时遇到了一些困难。

Exercise 8.2

Extend your switch-case statement with a default value. The result should be 'That is an unknown fruit.' when the variable 'myFruit' has an unknown value. Answer with the result where 'myFruit = pear'.

Write your code below and put the answer into the variable ANSWER.

var myFruit = "pear";
switch (myFruit) {
  case "banana":
  console.log("The banana is yellow.");
  break;
  case "apple":
  console.log("The apple is green.");
  break;
  case "kiwi":
  console.log("The kiwi is green.");
  break;
  case "plum":
  console.log("The plum is purple");
  break;
  default:
  console.log("That is an unknown fruit.");
  break;}

如何用变量表示这个结果？

我尝试这样写:

var result = switch (myFruit);

但这不起作用。

Answer 1

您可以声明 result 变量，并且在 switch 语句的情况下，您可以将值分配给 ，而不用 console.log 获取结果result 变量，如下所示:

var myFruit = "pear";
var result;
switch (myFruit) {
  case "banana":
      result = "The banana is yellow.";
      break;
  case "apple":
      result = "The apple is green.";
      break;
  case "kiwi":
      result = "The kiwi is green.";
      break;
  case "plum":
      result = "The plum is purple";
      break;
  default:
      result = "That is an unknown fruit.";
      break;
}

http://jsfiddle.net/uqxtmc25/