switch.js

这是《JavaScript学习源代码》一书的源代码

var num = 2;
switch(num)
{
  // is the number 1 ?
  case 1 : alert("This is case 1 code"); break;
  // is the number 2 ?
  case 2 : alert("This is case 2 code"); break;
  // is the number 3 ?
  case 3 : alert("This is case 3 code"); break;
  // if none of those numbers do this...
  default : alert("This is default code");
}