微信小程序自定义底部tarbar的代码实现

<template name="tabBar">
<view class="tabBar">
  <block wx:for="{{tabBar}}" wx:for-item="item" wx:key="tabBar">
    <view class="tabBar-item">
      <navigator open-type="redirect" url="{{item.pagePath}}">
        <view><image class="icon" src=&#39;{{item.iconPath}}&#39;></image></view>
        <view class="{{item.current== 1 ? &#39;tabBartext&#39; :&#39;&#39;}}">{{item.text}}</view>
      </navigator>  
    </view>
  </block>
</view>
</template>

.icon{
  width:54rpx;
  height: 54rpx;
}
.tabBar{
  width:100%;
  position: fixed;
  bottom:0;
  padding:10rpx;
  margin-left:-4rpx;
  background:#F7F7FA;
  font-size:20rpx;
  color:#8A8A8A;
  box-shadow: 6rpx 6rpx 6rpx 6rpx #aaa;
}

 .tabBar-item{
  float:left;
  width:25%;
  text-align: center;
  overflow: hidden;
}
/*当前字体颜色*/
.tabBartext{
  color:red;
}

//初始化数据
function tabbarinit() {
 return [
      { "current":0,
        "pagePath": "/pages/index/index",
        "iconPath": "/imgs/home.png",
        "selectedIconPath": "/imgs/home_on.png",
        "text": "主页"
      },
      {
        "current": 0,
        "pagePath": "/pages/news/news",
        "iconPath": "/imgs/message.png",
        "selectedIconPath": "/imgs/message_on.png",
        "text": "资讯"

      },
      {
        "current": 0,
        "pagePath": "/pages/category/category",
        "iconPath": "/imgs/category.png",
        "selectedIconPath": "/imgs/category_on.png",
        "text": "分类"
      },
      {
        "current": 0,
        "pagePath": "/pages/buy/buy",
        "iconPath": "/imgs/buy.png",
        "selectedIconPath": "/imgs/buy_on.png",
        "text": "购物"
      }
    ]

}
//tabbar 主入口
function tabbarmain(bindName = "tabdata", id, target) {
  var that = target;
  var bindData = {};
  var otabbar = tabbarinit();
  otabbar[id]['iconPath'] = otabbar[id]['selectedIconPath']//换当前的icon
  otabbar[id]['current'] = 1;
  bindData[bindName] = otabbar
  that.setData({ bindData });
}

module.exports = {
  tabbar: tabbarmain
}

@import "/template/template.wxss";

<import src="../../template/template.wxml"/>
<template is="tabBar" data="{{tabBar:bindData.tabBar}}"/>

const app = getApp()
var template = require('../../template/template.js');
Page({
  data: {

  },
  onLoad: function () {
    template.tabbar("tabBar", 0, this)//0表示第一个tabbar
  },
})

const app = getApp()
var template = require('../../template/template.js');
Page({
  data: {  },

  onLoad: function () {
    template.tabbar("tabBar", 1, this)//1表示第二个tabbar
  },

})