js 格式化时间戳

function formatDate(timestamp) {
	//timestamp为秒数
	var now = new Date(timestamp*1000);
	
	var year=now.getFullYear(); 
	var month=now.getMonth()+1; 
	var date=now.getDate();
	var hour=now.getHours(); 
	var minute=now.getMinutes(); 
	var second=now.getSeconds();
	var str = year+"年"+month+"月"+date+"日"+" "+hour+":"+minute+":"+second;
	return str;
}