微信小程序实现自定义底部导航

<template name="tabBar">
 <view class="tab-bar" style="color: {{tabBar.color}}; background: {{tabBar.backgroundColor}}; {{tabBar.position=='top'? 'top: 0' : 'bottom: 0'}};">
 <block wx:for="{{tabBar.list}}" wx:key="pagePath">
 <navigator hover-class="none" url="{{item.pagePath}}" open-type="redirect" class="tabbar_item {{item.clas}}" style="{{item.active? 'color: '+(item.selectedColor? item.selectedColor : tabBar.selectedColor) : ''}};position:relative;">
 <image src="{{item.selectedIconPath}}" wx:if="{{item.active&&item.selectedIconPath}}" class="img"></image>
 <image src="{{item.iconPath}}" wx:if="{{!item.active&&item.iconPath}}" class="img"></image>
 <image src="{{item.logo}}" wx:if="{{item.logo}}" style="width:110rpx;height:110rpx;border:10rpx solid #ffffff;border-radius:50%;position:absolute;top:-50%;left:-40%,"></image>
 <text class="tabbar_text" wx:if="{{item.text}}">{{item.text}}</text>
 </navigator>
 </block>
 </view>
</template>

 editTabBar: function () {
 //使用getCurrentPages可以获取当前加载中所有的页面对象的一个数组，数组最后一个就是当前页面。
 var curPageArr = getCurrentPages(); //获取加载的页面
 var curPage = curPageArr[curPageArr.length - 1]; //获取当前页面的对象
 var pagePath = curPage.route; //当前页面url
 if (pagePath.indexOf('/') != 0) {
 pagePath = '/' + pagePath;
 }
 var tabBar = this.globalData.tabBar;
 for (var i = 0; i < tabBar.list.length; i++) {
 tabBar.list[i].active = false;
 if (tabBar.list[i].pagePath == pagePath) {
 tabBar.list[i].active = true; //根据页面地址设置当前页面状态 
 }
 }
 curPage.setData({
 tabBar: tabBar
 });
 },
 globalData: {
 tabBar: {
 "color": "#B0B6B8",
 "selectedColor": "#4877BD",
 "backgroundColor": "#ffffff",
 "borderStyle": "#ccc",
 "list": [{
 "pagePath": "/pages/messagelist/messagelist",
 "text": "消息",
 "iconPath": "/img/message-1.png",
 "selectedIconPath": "/img/message-2.png",
 "selectedColor": "#4877BD",
 "clas": "menu-item",
 active: false
 },
 {
 "pagePath": "/pages/salefriend/salefriend",
 "text": "名片",
 "iconPath": "/img/card-1.png",
 "selectedIconPath": "/img/card-2.png",
 "selectedColor": "#4877BD",
 "clas": "menu-item",
 active: false
 },
 {
 "pagePath": "/pages/customnav/customnav",
 "text": "",
 // "iconPath": "/img/gifts.png",
 // "selectedIconPath": "/img/gifts.png",
 "logo":"/img/logo.png",
 "selectedColor": "#4877BD",
 "clas": "menu-item",
 islogo:true,
 active: false
 },
 {
 "pagePath": "/pages/salescircle/salescircle",
 "text": "发现",
 "iconPath": "/img/discover-1.png",
 "selectedIconPath": "/img/discover-2.png",
 "selectedColor": "#4877BD",
 "clas": "menu-item",
 active: false
 },
 {
 "pagePath": "/pages/mine/mine",
 "text": "我的",
 "iconPath": "/img/mine-1.png",
 "selectedIconPath": "/img/mine-2.png",
 "selectedColor": "#4877BD",
 "clas": "menu-item",
 active: false
 }
 ],
 "position": "bottom"
 },
 },

<import src="/components/tabbar.wxml" />
<template is="tabBar" data="{{tabBar}}" />

const app = getApp();
 onShow: function () {
 app.editTabBar(); //显示自定义的底部导航
 },