javascript时间戳格式转换为年月日

function formatUnixtimestamp (unixtimestamp){
//参数unixtimestamp
var unixtimestamp = new Date(parseInt(unixtimestamp));
var year = 1900 + unixtimestamp.getYear();
var month = “0” + (unixtimestamp.getMonth() + 1);
var date = “0” + unixtimestamp.getDate();
return year + “年” + month.substring(month.length-2, month.length) + “月” + date.substring(date.length-2, date.length)+“日”
}