//index.js
Page({
  data: {
    text: "This is page data."
  },
  onLoad: function(options) {
    // Do some initialize when page load.
  },
  onShow: function() {
    // Do something when page show.
  },
  onReady: function() {
    // Do something when page ready.
  },
  onHide: function() {
    // Do something when page hide.
  },
  onUnload: function() {
    // Do something when page close.
  },
  onPullDownRefresh: function() {
    // Do something when pull down.
  },
  onReachBottom: function() {
    // Do something when page reach bottom.
  },
  onShareAppMessage: function () {
    // return custom share data when user share.
  },
  onPageScroll: function() {
    // Do something when page scroll
  },
  onResize: function() {
    // Do something when page resize
  },
  onTabItemTap(item) {
    console.log(item.index)
    console.log(item.pagePath)
    console.log(item.text)
  },
  // Event handler.
  viewTap: function() {
    this.setData({
      text: 'Set some data for updating view.'
    }, function() {
      // this is setData callback
    })
  },
  customData: {
    hi: 'MINA'
  }
})

<view>{{text}}</view>
<view>{{array[0].msg}}</view>

Page({
  data: {
    text: 'init data',
    array: [{msg: '1'}, {msg: '2'}]
  }
})

Page({
  onShareAppMessage(res) {
    if (res.from === 'button') {
      // 来自页面内转发按钮
      console.log(res.target)
    }
    return {
      title: '自定义转发标题',
      path: '/page/user?id=123'
    }
  }
})

Page({
  onTabItemTap(item) {
    console.log(item.index)
    console.log(item.pagePath)
    console.log(item.text)
  }
})

<view bindtap="viewTap"> click me </view>

Page({
  viewTap: function() {
    console.log('view tap')
  }
})

Page({
  viewTap: function() {
    console.log('view tap')
  }
})

<!--index.wxml-->
<view>{{text}}</view>
<button bindtap="changeText"> Change normal data </button>
<view>{{num}}</view>
<button bindtap="changeNum"> Change normal num </button>
<view>{{array[0].text}}</view>
<button bindtap="changeItemInArray"> Change Array data </button>
<view>{{object.text}}</view>
<button bindtap="changeItemInObject"> Change Object data </button>
<view>{{newField.text}}</view>
<button bindtap="addNewField"> Add new data </button>

// index.js
Page({
  data: {
    text: 'init data',
    num: 0,
    array: [{text: 'init data'}],
    object: {
      text: 'init data'
    }
  },
  changeText: function() {
    // this.data.text = 'changed data' // 不要直接修改 this.data
    // 应该使用 setData
    this.setData({
      text: 'changed data'
    })
  },
  changeNum: function() {
    // 或者，可以修改 this.data 之后马上用 setData 设置一下修改了的字段
    this.data.num = 1
    this.setData({
      num: this.data.num
    })
  },
  changeItemInArray: function() {
    // 对于对象或数组字段，可以直接修改一个其下的子字段，这样做通常比修改整个对象或数组更好
    this.setData({
      'array[0].text':'changed data'
    })
  },
  changeItemInObject: function(){
    this.setData({
      'object.text': 'changed data'
    });
  },
  addNewField: function() {
    this.setData({
      'newField.text': 'new data'
    })
  }
})