js 格式化时间毫秒

//格式华日期为2017-12-20
    function datefomate(value) {
        if(value==null || value == undefined){
            return "";
        }
        var date = new Date(value);
        
        Y = date.getFullYear(),
            m = date.getMonth()+1,
            d = date.getDate(),
            H = date.getHours(),
            i = date.getMinutes(),
            s = date.getSeconds();
        return Y+'-'+m+'-'+d;
    };

在 mui的template模板中 <span id="">{{item.createTime|datefomate}}</span>