js日期长整型和字符串转换

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; 
}; 
var getFormateDateByLong = function(longtime){
var date = new Date();
date.setTime(longtime);
return date.format("yyyy-MM-dd hh:mm:ss");
};
var getLongTimeByStr = function(datestr){
var date = new Date(datestr.replace("-", "/").replace("-", "/"));
return date.getTime();
};