javaScript中将时间戳转换成日期格式

function DateFormt(time, format) {
var testDate = new Date(time * 1000);
var o =
{
"M+": testDate.getMonth() + 1,
"d+": testDate.getDate(),
"h+": testDate.getHours(),
"m+": testDate.getMinutes(),
"s+": testDate.getSeconds(),
"q+": Math.floor((testDate.getMonth() + 3) / 3),
"S": testDate.getMilliseconds()
}
if (/(y+)/.test(format)) {
format = format.replace(RegExp.$1, (testDate.getFullYear() + "").substr(4 - RegExp.$1.length));
}
for (var k in o) {
if (new RegExp("(" + k + ")").test(format)) {
format = format.replace(RegExp.$1, RegExp.$1.length == 1 ? o[k] : ("00" + o[k]).substr(("" + o[k]).length));
}
}
return format;
}