获取body 所有的子元素，这样写为什么不行？

Question

<script type="text/javascript">

        countBodyChildren() {

            var body_element = document.getElementsByTagName("body")[0];

            alert(body_element.childNodes.length);

        }

        window.onload = countBodyChildren;

    </script>

Answer 1

函数声明语句写错了，哪能这么搞var countBodyChildren = function() {&nbsp; &nbsp; var body_element = document.getElementsByTagName("body")[0];&nbsp; &nbsp; &nbsp;alert(body_element.childNodes.length); };