Javascript获取系统时间

<script>
var myDate = new Date();

function ShowTime()
{
alert("现在时间："+myDate.getFullYear()+"年"
+myDate.getMonth()+"月"
+myDate.getDate()+"日"
+myDate.getHours()+"时"
+myDate.getMinutes()+"分"
+myDate.getSeconds()+"秒"
+myDate.getMilliseconds()+"毫秒"
+"\n"+"也就是说："+myDate.toLocaleString())
}
</script>
<button onclick="ShowTime()">获取时间</button>