求解javascript入门问题

<script type="text/javascript">
        document.write("<h2>对变量或值调用typeof运算符返回值</h2>");
        var width, height = 10, name = "rose";
        var arrlist = new date();
        document.write(typeof (width) + "<br>");
        document.write(typeof (height) + "<br>");
        document.write(typeof (name) + "<br>");
        document.write(typeof (true) + "<br>");
        document.write(typeof (null) + "<br>");
        document.write(typeof (arrlist));
      
    </script>

运行结果为什么只有一句                             对变量或值调用typeof运算符返回值                         下面6局都没有