1.从Vant Weapp官网github克隆一份代码下来
https://github.com/youzan/vant-weapp 


2.把克隆代码的dist目录下的所有文件复制到我们自己项目的/static/vant/目录下
这里注意,好像一定要是这个目录 static/vant



3.在需要引入的页面目录下的main.json文件中
{ 
  "usingComponents": {
      "van-button": "/static/vant/button/index",
      "van-cell": "/static/vant/cell/index",
      "van-cell-group": "/static/vant/cell-group/index"
  }
}

也可以配置在app.json文件中(这样就不用每个页面都去配置,并且用户组件中也可以使用的)
"usingComponents": {
      "van-button": "/static/vant/button/index",
      "van-cell": "/static/vant/cell/index",
      "van-cell-group": "/static/vant/cell-group/index"
}

4.使用
<van-button>测试</van-button>





参考:
https://github.com/Rychou/mpvue-vant
Vant Weapp官网:
https://youzan.github.io/vant-weapp