取当前时间，格式为,yyyy-mm-dd hh:mm:ss

function CurentTime()

    { 

        var now = new Date();

        

        var year = now.getFullYear();       //年

        var month = now.getMonth() + 1;     //月

        var day = now.getDate();            //日

        

        var hh = now.getHours();            //时

        var mm = now.getMinutes();          //分

        var ss = now.getSeconds();           //秒

        

        var clock = year + "-";

        

        if(month < 10)

            clock += "0";

        

        clock += month + "-";

        

        if(day < 10)

            clock += "0";

            

        clock += day + " ";

        

        if(hh < 10)

            clock += "0";

            

        clock += hh + ":";

        if (mm < 10) clock += '0'; 

        clock += mm + ":"; 

         

        if (ss < 10) clock += '0'; 

        clock += ss; 

        return(clock); 

}

 alert(CurentTime())就可以了