time-zone.js

来自「这是《JavaScript学习源代码》一书的源代码」· JavaScript 代码 · 共 21 行

// create a new Date object
var now = new Date();

// get the number of minutes offset from UTC
var offset = now.getTimezoneOffset();

// create an empty variable
var msg;

// assign an appropriate message
switch(offset)
{
  case 300 : msg = "East Coast"; break;
  case 360 : msg = "Central"; break;
  case 420 : msg = "Mountain"; break;
  case 480 : msg = "Pacific"; break;
  default  : msg = "all";
}

// display the message
alert("Welcome to " +msg+ " visitors.");