编写具有多个条件的语句的更好方法

switch (expression) {
  case value1:
    // 当expression等于value1时执行的代码块
    break;
  case value2:
    // 当expression等于value2时执行的代码块
    break;
  ...
  default:
    // 当expression不等于任何case值时执行的代码块
}

var fruit = "apple";

switch (fruit) {
  case "apple":
    console.log("It's an apple.");
    break;
  case "banana":
    console.log("It's a banana.");
    break;
  case "orange":
    console.log("It's an orange.");
    break;
  default:
    console.log("It's an unknown fruit.");
}