微信小程序—收藏功能

wxml代码如下:

 <image src="{{isFavorite=='false'?'/images/menu/collect.png':'/images/menu/uncollect.png'}}" class='collect' bindtap='collect'></image><span class="num font_s30 font_c32">收藏</span>

js部分代码如下：

  data: {
    isFavorite: "false",
  },
collect:function() {
      var that = this;
      var isFavorite = that.data.isFavorite;
      //收藏
      if (isFavorite == 'false') {
        var roomId = that.data.roomId;
          that.setData({
            isFavorite:'true'
          })
          wx.showToast({
            title: '收藏成功',
            icon: 'none'
          })
      } 
      //取消收藏
      else if(isFavorite == 'true') {
        var roomId = that.data.roomId;
          that.setData({
            isFavorite: 'false'
          })
          wx.showToast({
            title: '取消成功',
            icon: 'none'
          })
      }

  },

实现效果如下：