<view class="{{flag ? 'change' : 'change_after'}}">改變字體顏色</view>  //flage為true／false時，選擇class名

//XML頁面：
<text style='font-size:26rpx; color:#ff0000'>{{counts}}</text>

//JS頁面：
 onLoad: function (options) {
    var counts = wx.getStorageSync('key')  //獲取緩存值
    this.data.currentcounts = counts  //***把counts賦值給data的屬性currentcounts
    if (counts) { //判斷是否存在緩存值
      this.setData({  //存在的話，將值綁定到counts
        counts: counts
      })
    } else {
      wx.setStorageSync('key', 9)  //不存在的話，設(shè)置緩存值。（為方便測試，這里設(shè)置為9）
    }
    // console.log(counts);
  },

  self_redution: function (event) {  //自定義方法
    var a = wx.getStorageSync('key')  //取得緩存值
    if (a > 0) { 
      var b = a - 1  //大于0，那么自身值減一
    } else {
      var b = this.data.currentcounts //***否則，緩存值為上面設(shè)置的值
    }
    console.log(b);
    a = wx.setStorageSync('key', b)
    this.setData({
      counts: b,  //將緩存值綁定到counts
    })


   formSubmit: function (event) {

      this.self_redution() //調(diào)用上面自定義方法

   },

this.data.currentcounts = counts  //首先先在onload中：將counts賦值給data的屬性currentcounts

var b = this.data.currentcounts  //然后在表單的提交函數(shù)中： this.data.currentcounts就是我們上面的counts值

//某個js文件下

  self_redution:function(event){    //定義方法
    console.log("我來自自定義方法：自減");
  },


  formSubmit: function (event) {

    this.self_redution()  //調(diào)用方法(別忘記加this)

  },

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