JS 显示周 几和 月 日

function getMyDay(date){

                var week;

                var month = date.getMonth() + ;

                   var day = date.getDate();

                if(date.getDay()==) week="周日"

                if(date.getDay()==) week="周一"

                if(date.getDay()==) week="周二"

                if(date.getDay()==) week="周三"

                if(date.getDay()==) week="周四"

                if(date.getDay()==) week="周五"

                if(date.getDay()==) week="周六"

                return week + ' ' + [month, day].map(formatNumber).join('-');

            }

            function formatNumber(n) {

                n = n.toString()

                return n[] ? n : '' + n

            }