小程序自定义组件赋值

<cover-view class="tab-bar">
    <cover-view class="tab-bar-border"></cover-view>
    <cover-view wx:for="{{list}}" wx:key="index" class="tab-bar-item" data-path="{{item.pagePath}}" data-index="{{index}}" bindtap="tabChange">
        <cover-image src="{{tabbarIndex === index ? item.selectedIconPath : item.iconPath}}"></cover-image>
        <cover-view style="color: {{tabbarIndex === index ? selectedColor : color}}">{{item.text}}</cover-view>
    </cover-view>
</cover-view>

Component({
  /**
 1. 组件的属性列表
   */
  options: {
    multipleSlots: true //在组件定义时的选项中启用多slot支持
  },
  properties: {
    list: {// 属性名
      type: Array,
      value: []
    },
    selectedColor:{// 属性名
      type: String,
      value:''
    },
    color:{// 属性名
      type: String,
      value:''
    },
  },

  /**
 2. 组件的初始数据
   */
  data: {
    tabbarIndex: 0//默认显示第一个tab元素
  },

  lifetimes: {
    attached() {}
  },

  /**
 3. 组件的方法列表
   */
  methods: {
    //组件的点击事件
    tabChange(e) {
      //获取到底部栏元素的下标
      let index = e.currentTarget.dataset.index;
      this.setData({
        tabbarIndex:index,
      })
  }
})

{
  "component": true,
  "usingComponents": {}
}

{
  "navigationBarTitleText": "测试",
  "usingComponents": {
    "mp-tabbar": "../components/tabBar/index"
  }
}

<view wx:if="{{tabbarIndex == 0}}">111111</view>
<view wx:if="{{tabbarIndex == 1}}">222222</view>
<view wx:if="{{tabbarIndex == 2}}">333333</view>
<mp-tabbar list="{{list}}" id='tabComponent' bind:onMyEvent="switchTab"></mp-tabbar>

data: {
    tabbarIndex:0,//默认显示市场
    color: "#555555",
    selectedColor: "#2ea7e0",
    //底部栏
    items: [{
        "text": "市场",
        "iconPath": "/images/bazaar.png",
        "selectedIconPath": "/images/tselected.png",
      },
      {
        "text": "充值",
        "iconPath": "/images/recharge.png",
        "selectedIconPath": "/images/recharge_selected.png",
      }, {
        "text": "车队",
        "iconPath": "/images/market.png",
        "selectedIconPath": "/images/market_selected.png",
      }
    ]
  },
  onShow: function () {
    this.tabComponent = this.selectComponent('#tabComponent');
    let selectedColor = this.data.selectedColor;
    let color = this.data.color;
    this.tabComponent.setData({
      selectedColor: selectedColor,
      color:color
   })
   console.log(this.tabComponent.data.tabbarIndex)
  },