1. 例如： let time =‘2019-10-11 15:17:49’
2. 年月日：let ti = time.split(’ ');
3. 年月日：

       var timearr = time.replace(" ", ":").replace(/\:/g, "-").split("-");
       var timestr = timearr[0]+"年"+ Number(timearr[1])+ "月" + timearr[2]+"日";

4. 时、分：

       var timearr = time.replace(" ", ":").replace(/\:/g, "-").split("-");
       var timestr = ""+timearr[3]+ " ：" + timearr[4]+" ";

完整时间截取的方法：

     getPartTime(val){
                //let ti = val.split(' ');
                var timearr = val.replace(" ", ":").replace(/\:/g, "-").split("-");
                var timestr = ""+ Number(timearr[1])+ "月" + timearr[2]+"日";
                console.log(4444,val)
                return timestr;
            },

调用：

   <div class="mui-media-body">
		<div class="mui-media-body-header">
			<span class="h-title">{{item.title}}</span>
			<span class="h-date">{{getPartTime(item.createTime)}}</span>
		</div>
		<div class="mui-media-body-trail">
			<p class='mui-ellipsis'>您有14条任务通知还未查看</p>
			<span class="mui-badge mui-badge-danger">{{item.num}}</span>
		</div>
	</div>