求求大神解答

var now=new Date();  var weekday=new Array["星期日","星期一","星期二","星期三","星期四","星期五","星期六"];  var year=now.getFullYear();  var month=now.getMonth()+1;  var dates=now.getDate();  var day=now.getDay();  var time=year+"年"+month+"月"+dates+"日"+"星期"+weekday[day];  document.write(time); 网页什么都没有，我哪里错了？