// index.js
Page({
  data: {
    time: (new Date()).toString(),
    addr: "北京"
  },
  but: function(){
    console.log("你好");
    this.setData(
      {},
      function(){
        wx.navigateTo({
          "url": "/qrcode/home/home"
        })
      }
    )
  }
})

// index.wxml
<view>Hello World!</view>
<view>{{addr}}时间：{{time}}</view>
<button bindtap="but">点击按钮</button>