wxss

.content {
  display: flex;
  flex-direction: row;
  font-family: "Microsoft YaHei"
}
.left {
  width: 30%;
  font-size: 10px;
  height: 500px;
  background-color: #F4F4F4;
}
.left view {
  text-align: center;
  height: 45px;
  line-height: 45px;
}
.select {
  background-color: #ffffff;
  border-left: 2px solid #36AE66;
  font-weight: bold;
  color: #36AE66;
}
.normal {
  background-color: #F4F4F4;
  border-bottom: 1px solid #f2f2f2;
}
.right {
  width: 70%;
  margin: 0px;
}

js

Page({
  data: {
    flag: 0,
    currentTab: 0
  },
  switchNav: function(e) {
    var page = this;
    var id = e.target.id;
    if (this.data.currentTab == id) {
      return false;
    } else {
      page.setData({
        currentTab: id
      });
    }
    page.setData({
      flag: id
    });
  },
  catchTouchMove: function (res) {
    return false
  }
})

实现效果