html5rocks.com has a very good tutorial on this stuff, and this might be a little late, but I myself didn't know this existed. w3schools also has a way to do this using their new library called w3.js. The thing is, this requires the use of a web server and and HTTPRequest object. You can't actually load these locally and test them on your machine. What you can do though, is use polyfills provided on the html5rocks link at the top, or follow their tutorial. With a little JS magic, you can do something like this:

 var link = document.createElement('link');
 if('import' in link){
     //Run import code
     link.setAttribute('rel','import');
     link.setAttribute('href',importPath);
     document.getElementsByTagName('head')[0].appendChild(link);
     //Create a phantom element to append the import document text to
     link = document.querySelector('link[rel="import"]');
     var docText = document.createElement('div');
     docText.innerHTML = link.import;
     element.appendChild(docText.cloneNode(true));
 } else {
     //Imports aren't supported, so call polyfill
     importPolyfill(importPath);
 }

This will make the link (Can change to be the wanted link element if already set), set the import (unless you already have it), and then append it. It will then from there take that and parse the file in HTML, and then append it to the desired element under a div. This can all be changed to fit your needs from the appending element to the link you are using. I hope this helped, it may irrelevant now if newer, faster ways have come out without using libraries and frameworks such as jQuery or W3.js.

UPDATE:这将抛出一个错误，表示本地导入已被CORS策略阻塞。可能需要访问深层网络才能使用它，因为深层网络的特性。(意思是没有实际用途)

如果你使用一些框架，比如django/bootle，他们通常会提供一些模板引擎。 假设您使用了bottle，默认的模板引擎是SimpleTemplate engine。 下面是纯html文件

$ cat footer.tpl
<hr> <footer>   <p>&copy; stackoverflow, inc 2015</p> </footer>

你可以包括页脚。TPL在你的主文件中，比如:

$ cat dashboard.tpl
%include footer

除此之外，您还可以将参数传递给dashboard .tpl。

扩展lolo的回答，如果您必须包含很多文件，这里有更多的自动化。使用下面的JS代码:

$(function () {
  var includes = $('[data-include]')
  $.each(includes, function () {
    var file = 'views/' + $(this).data('include') + '.html'
    $(this).load(file)
  })
})

然后在html中包含一些东西:

<div data-include="header"></div>
<div data-include="footer"></div>

这将包括文件views/header.html和views/footer.html。

你可以用JavaScript的jQuery库来实现这一点，就像这样:

HTML:

<div class="banner" title="banner.html"></div>

JS:

$(".banner").each(function(){
    var inc=$(this);
    $.get(inc.attr("title"), function(data){
        inc.replaceWith(data);
    });
});

请注意banner.html应该位于您的其他页面所在的相同域下，否则您的网页将拒绝banner.html文件，因为跨源资源共享政策。

另外，请注意，如果您使用JavaScript加载内容，谷歌将无法对其进行索引，因此对于SEO而言，这并不是一个好方法。

一个非常老的解决方案满足了我当时的需求，但下面是如何做到标准兼容的代码:

<!--[if IE]>
<object classid="clsid:25336920-03F9-11CF-8FD0-00AA00686F13" data="some.html">
<p>backup content</p>
</object>
<![endif]-->

<!--[if !IE]> <-->
<object type="text/html" data="some.html">
<p>backup content</p>
</object>
<!--> <![endif]-->

作为一种替代方法，如果你可以访问服务器上的。htaccess文件，你可以添加一个简单的指令，允许php在以。html扩展名结尾的文件上被解释。

RemoveHandler .html
AddType application/x-httpd-php .php .html

现在你可以使用一个简单的php脚本来包含其他文件，比如:

<?php include('b.html'); ?>