var type = _xAxis[0].split(/-|:|\s/).length;

    function getDateDiffByType(newDate,endDate,type){

        newDate = new Date(newDate) == 'Invalid Date' ? newDate+':00' : newDate;

        endDate = new Date(endDate) == 'Invalid Date' ? endDate+':00' : endDate;

        var dateDiff = new Date(endDate)-new Date(newDate);

        var _date = new Date(dateDiff);

        var year = _date.getFullYear() - 1970;

        var month = _date.getMonth();

        switch (type) {

            case 1: {

                return year;

                break;

            }

            case 2: {

                return month+year*12;

                break;

            }

            case 3: {

                return dateDiff/1000/60/60/24;

                break;

            }

            case 4: {

                return dateDiff/1000/60/60;

                break;

            }

            case 5: {

                return dateDiff/1000/60;

                break;

            }

            case 6: {

                return dateDiff/1000;

                break;

            }

        }

    }　

function dateFmtByType( _date,_type) {

		_date = new Date(_date) == 'Invalid Date' ? _date+':00' : _date;//"2017-02-12 12"是Invalid Date

		var date = new Date(_date);

		var fmt = ["yyyy","yyyy-MM","yyyy-MM-dd","yyyy-MM-dd hh","yyyy-MM-dd hh:mm","yyyy-MM-dd hh:mm:ss"];

		return date.dateFormat(fmt[_type-1]);

	}

Date.prototype.dateFormat = function(fmt)

{ //author: meizz

  var o = {

    "M+" : this.getMonth()+1,                 //月份

    "d+" : this.getDate(),                    //日

    "h+" : this.getHours(),                   //小时

    "m+" : this.getMinutes(),                 //分

    "s+" : this.getSeconds(),                 //秒

    "q+" : Math.floor((this.getMonth()+3)/3), //季度

    "S"  : this.getMilliseconds()             //毫秒

  };

  if(/(y+)/.test(fmt))

    fmt=fmt.replace(RegExp.$1, (this.getFullYear()+"").substr(4 - RegExp.$1.length));

  for(var k in o)

    if(new RegExp("("+ k +")").test(fmt))

  fmt = fmt.replace(RegExp.$1, (RegExp.$1.length==1) ? (o[k]) : (("00"+ o[k]).substr((""+ o[k]).length)));

  return fmt;

}