<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head>

    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

    <title></title>

    <script type="text/javascript">

        //childNodes  我很少用，感觉用的不是很方便

        //window.onload = function () {

        //    var oUl = document.getElementById("ul");

        //    for (var i = 0; oUl.childNodes.length; i++) {

        //        //nodeType=1,元素节点

        //        //nodeType=3,文本节点

        //        if (oUl.childNodes[i].nodeType == 1) {

        //            oUl.childNodes[i].style.background="red";

        //        }

        //    }

        //}

        window.onload = function () {

            var oU = document.getElementById("ul1");

            for (var i = 0; i < oU.children.length; i++) {

                //children  只包括元素节点，不包括文本节点

                oU.children[i].style.background = "red";

            }

        }

    </script>

</head>

<body>

    <ul id="ul1">

        <li></li>

        <li></li>

    </ul>

</body>

</html>