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Javascript DOM - 如何在元素之前添加innerHTML

inner 【inner】
我们想知道如何在元素之前添加innerHTML。
代码展示 运行结果 

<!DOCTYPE html>
<html>
<body>
  <div>Before foo</div>
  <div id="foo"></div>
  <div>After foo</div>
  <script>
    setTimeout(function() {
      var yourHTMLString = "<span>hello, world</span><div></div>Foo<img src=\"http://www.w3cschool.cn/style/download.png\" />Bar";
      var foo = document.getElementById("foo");
      var parent = foo.parentNode;
      var helper = document.createElement('div');
      helper.innerHTML = yourHTMLString;
      while (helper.firstChild) {
         parent.insertBefore(helper.firstChild, foo);
      }
    }, 500);
  </script>
</body>
</html>