如何检测网页是否从网站或本地文件系统运行

I'm a newbie to javascript. How can I detect if my javascript is being run from a web site (http://) vs a local file.

我是javascript的新手。如何检测我的javascript是从网站(http://)运行到本地文件。

2 个解决方案

#1

switch(window.location.protocol) {
   case 'http:':
   case 'https:':
     //remote file over http or https
     break;
   case 'file:':
     //local file
     break;
   default: 
     //some other protocol
}

#2

Other ways to do this:

其他方法:

if (/^h/.test(document.location)) {
  // remote file over http or https
} else {
  // local file
}

or

if (document.location.host) {
  // remote file over http or https
} else {
  // local file
}

or (slow, not recommended)

或(慢,不推荐)

if ((''+document.location).indexOf('http') === 0) {
// if (document.location.protocol.indexOf('http') === 0) { // another way
  // remote file over http or https
} else {
  // local file
}