javascript语言怎么实现取得本地时间？

<script language="javascript">

var current_time=new Date();

var strDate=current_time.getYear()+"年";

strDate+=current_time.getMonth()+"月";

strDate+=current_time.getDate()+"日";

//strDate+=current_time.getHours()+":";

//strDate+=current_time.getMinutes()+":";

// strDate+=current_time.getSeconds();

//alert(strDate) //弹出窗口显示

</script>