微信小程序实例：编写tabBar模板

        众所周知，微信小程序的tabBar都是新开页面的，而微信文档上又表明了最多只能打开5层页面。这样就很容易导致出问题啦，假如我的tabBar有5个呢？下面是微信原话：

一个应用同时只能打开5个页面，当已经打开了5个页面之后，wx.navigateTo不能正常打开新页面。请避免多层级的交互方式，或者使用wx.redirectTo

        因此这几天想着根据微信tabBar数组来自定义模板供页面调用。不过我在list里面每个对象都增加了一个selectedColor和active属性，方便对每个tabBar当前页做样式，如果不传直接使用设置的selectedColor。因此这串数据只能设定在各个页面下，不能设定在公用的app.js配置文件下，稍微有点代码冗余，下次研究下怎么直接配置到app.js完善下。 

        只要新建一个tarBar.wxml模板页，然后引用模板的页面传入数据即可，代码如下：

<template name="tabBar">  <view class="flex-h flex-hsb tab-bar" style="color: {{tabBar.color}}; background: {{tarBar.backgroundColor}}; {{tabBar.position=='top'? 'top: 0' : 'bottom: 0'}}; {{tabBar.borderStyle? (tabBar.position=='top'? 'border-bottom: solid 1px '+tabBar.borderStyle + ';' : 'border-top: solid 1px '+tabBar.borderStyle + ';') : ''}}">  <block wx:for="{{tabBar.list}}" wx:key="pagePath">    <navigator url="{{item.pagePath}}" open-type="redirect" class="menu-item" style="{{item.active? 'color: '+(item.selectedColor? item.selectedColor : tabBar.selectedColor) : ''}}">      <image src="{{item.selectedIconPath}}" wx:if="{{item.active}}"></image>      <image src="{{item.iconPath}}" wx:if="{{!item.active}}"></image>      <text>{{item.text}}</text>    </navigator>    </block>  </view></template>

        接下来进行测试，首先是index.js的配置对象：

//配置tabBar    tabBar: {      "color": "#9E9E9E",      "selectedColor": "#f00",      "backgroundColor": "#fff",      "borderStyle": "#ccc",      "list": [        {          "pagePath": "/pages/index/index",          "text": "主页",          "iconPath": "../../img/tabBar_home.png",          "selectedIconPath": "../../img/tabBar_home_cur.png",          //"selectedColor": "#4EDF80",          active: true        },        {          "pagePath": "/pages/village/city/city",          "text": "目的地",          "iconPath": "../../img/tabBar_village.png",          "selectedIconPath": "../../img/tabBar_village_cur.png",          "selectedColor": "#4EDF80",          active: false        },        {          "pagePath": "/pages/mine/mine",          "text": "我的",          "iconPath": "../../img/tabBar_mine.png",          "selectedIconPath": "../../img/tabBar_mine_cur.png",          "selectedColor": "#4EDF80",          active: false        }      ],      "position": "bottom"    }

        index.wxml引入模板：

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

        接下来是mine.js文件引入配置对象：

//配置tabBar    tabBar: {      "color": "#9E9E9E",      "selectedColor": "#f00",      "backgroundColor": "#fff",      "borderStyle": "#ccc",      "list": [        {          "pagePath": "/pages/index/index",          "text": "主页",          "iconPath": "../../img/tabBar_home.png",          "selectedIconPath": "../../img/tabBar_home_cur.png",          //"selectedColor": "#4EDF80",          active: false        },        {          "pagePath": "/pages/village/city/city",          "text": "目的地",          "iconPath": "../../../img/tabBar_village.png",          "selectedIconPath": "../../../img/tabBar_village_cur.png",          "selectedColor": "#4EDF80",          active: false        },        {          "pagePath": "/pages/mine/mine",          "text": "我的",          "iconPath": "../../img/tabBar_mine.png",          "selectedIconPath": "../../img/tabBar_mine_cur.png",          "selectedColor": "#4EDF80",          active: true        }      ],      "position": "bottom"    }

       mine.wxml引入模板：

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

        最后演示如下：

************************************************************************************************************

        方案二，我把配置数据统一放在app.js文件，通过点击跳转页面后在把数据添加到当前页面实例上，具体做法如下：

        1、app.js文件配置：

//app.jsvar net = require('common/net');var a_l, a_d = {}, a_cbSucc, a_cbSuccFail, a_cbFail, a_cbCom, a_h, a_m;App({  onLaunch: function () {    var that = this;  },  //修改tabBar的active值  editTabBar: function () {    var _curPageArr = getCurrentPages();    var _curPage = _curPageArr[_curPageArr.length - 1];//相当于Page({})里面的this对象    var _pagePath=_curPage.__route__;    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: {    userInfo: null,    //配置tabBar    tabBar: {      "color": "#9E9E9E",      "selectedColor": "#f00",      "backgroundColor": "#fff",      "borderStyle": "#ccc",      "list": [        {          "pagePath": "/pages/index/index",          "text": "主页",          "iconPath": "/pages/templateImg/tabBar_home.png",          "selectedIconPath": "/pages/templateImg/tabBar_home_cur.png",          "selectedColor": "#4EDF80",          active: false        },        {          "pagePath": "/pages/village/city/city",          "text": "目的地",          "iconPath": "/pages/templateImg/tabBar_village.png",          "selectedIconPath": "/pages/templateImg/tabBar_village_cur.png",          "selectedColor": "#4EDF80",          active: false        },        {          "pagePath": "/pages/mine/mine",          "text": "我的",          "iconPath": "/pages/templateImg/tabBar_mine.png",          "selectedIconPath": "/pages/templateImg/tabBar_mine_cur.png",          "selectedColor": "#4EDF80",          active: false        }      ],      "position": "bottom"    }  }})

        2、index.js+mine.js+city.js页面使用：

var App=getApp();Page({  data:{    detail: {},  },  onLoad:function(options){    App.editTabBar();//添加tabBar数据    var that=this;  }})

        最终演示和上图一致！