dd-mm-yy & yy-mm-dd时间格式，js互转。

1、dd-mm-yy 转为 yy-mm-dd

var str = “15-05-2018”;
var reg =/(\d{2})-(\d{2})-(\d{4})/;
var date = str.replace(reg,”$3-$2-$1”);

2、yy-mm-dd 转为 dd-mm-yy

var data=”2018-05-15”;
var reg =/(\d{4})-(\d{2})-(\d{2})/;
var rightData = data.replace(reg,”$3-$2-$1”);