js 将long型字符串转换成日期格式

工作中难免会碰到日期的转换,往往为了方便,后台都是把时间以long型(形如1343818800000)返回给web前端.再有前端自己根据页面需求转换成相应的日期格式.这里将我常用的一个转换时间的函数贴上:

//转换时间函数
Date.prototype.format = function (format) {
    var o = {
        "M+": this.getMonth() + 1,
        "d+": this.getDate(),
        "h+": this.getHours(),
        "m+": this.getMinutes(),
        "s+": this.getSeconds(),
        "q+": Math.floor((this.getMonth() + 3) / 3),
        "S": this.getMilliseconds()
    };
    if (/(y+)/.test(format)) {
        format = format.replace(RegExp.$1, (this.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;
} ;

//转换long型为日期字符串
function getFormatDateByLong(l, pattern) {
    return getFormatDate(new Date(l), pattern);
}
//转换日期对象为日期字符串
function getFormatDate(date, pattern) {
    if (date == undefined) {
        date = new Date();
    }
    if (pattern == undefined) {
        pattern = "yyyy-MM-dd hh:mm:ss";
    }
    return date.format(pattern);
}
function getSmpFormatDate(date, isFull) {
    var pattern = "";
    if (isFull == true || isFull == undefined) {
        pattern = "yyyy-MM-dd hh:mm:ss";
    } else if(isFull==2){
        pattern = "yyyy-MM-dd hh:mm";
    }
    else {
        pattern = "yyyy-MM-dd";
    }
    return getFormatDate(date, pattern);
}
function getSmpFormatDateByLong(date, isFull) {
    if(date=='' || date==null){
        return
    }
    return getSmpFormatDate(new Date(date), isFull);
}