如何 - 包含 HTML

<a href="howto_google_maps.asp">Google Maps</a><br>
<a href="howto_css_animate_buttons.asp">动画按钮</a><br>
<a href="howto_css_modals.asp">模态框</a><br>
<a href="howto_js_animate.asp">动画</a><br>
<a href="howto_js_progressbar.asp">进度条</a><br>
<a href="howto_css_dropdown.asp">悬停下拉菜单</a><br>
<a href="howto_js_dropdown.asp">点击下拉菜单</a><br>
<a href="howto_css_table_responsive.asp">响应式表格</a><br>

<div w3-include-html="content.html"></div>

<script>
function includeHTML() {
  var z, i, elmnt, file, xhttp;
  /* 循环遍历所有 HTML 元素的集合：*/
  z = document.getElementsByTagName("*");
  for (i = 0; i < z.length; i++) {
    elmnt = z[i];
    /* 搜索具有特定属性的元素：*/
    file = elmnt.getAttribute("w3-include-html");
    if (file) {
      /* 使用属性值作为文件名进行 HTTP 请求：*/
      xhttp = new XMLHttpRequest();
      xhttp.onreadystatechange = function() {
        if (this.readyState == 4) {
          if (this.status == 200) {elmnt.innerHTML = this.responseText;}
          if (this.status == 404) {elmnt.innerHTML = "Page not found.";}
          /* 移除属性，并再次调用此函数：*/
          elmnt.removeAttribute("w3-include-html");
          includeHTML();
        }
      }
      xhttp.open("GET", file, true);
      xhttp.send();
      /* 退出函数：*/
      return;
    }
  }
}
</script>

<script>
includeHTML();
</script>

<div w3-include-html="h1.html"></div>
<div w3-include-html="content.html"></div>