微信自带的顶部导航栏是无法支持自定义icon和增加元素的，在开发小程序的时候自带的根本满足不了需求，分享一个封装好的组件，支持自定义icon、扩展dom，适配安卓、ios、h5，全面屏。
我用的是京东的Taro多端编译框架写的小程序，原生的也可以适用，用到的微信/taro的api做调整就行，实现效果如下。

1、NavBar.js

import Taro from '@tarojs/taro';import React, { Component } from 'react'import { View } from '@tarojs/components';import { isFunction } from '../../utils/index' //判断是否为函数，可以用loadsh的_isFunction,也可以自己封装。import './NavBar.less';function getSystemInfo () { if (Taro.globalSystemInfo && !Taro.globalSystemInfo.ios) { return Taro.globalSystemInfo; } else { // h5环境下忽略navbar if (!isFunction(Taro.getSystemInfoSync)) { return null; } let systemInfo = Taro.getSystemInfoSync() || { model: '', system: '' }; let ios = !!(systemInfo.system.toLowerCase().search('ios') + 1); let rect; try { rect = Taro.getMenuButtonBoundingClientRect ? Taro.getMenuButtonBoundingClientRect() : null; if (rect === null) { throw 'getMenuButtonBoundingClientRect error'; } //取值为0的情况 有可能width不为0 top为0的情况 if (!rect.width || !rect.top || !rect.left || !rect.height) { throw 'getMenuButtonBoundingClientRect error'; } } catch (error) { let gap; //胶囊按钮上下间距 使导航内容居中 let width = 96; //胶囊的宽度 if (systemInfo.platform === 'android') { gap = 8; width = 96; } else if (systemInfo.platform === 'devtools') { if (ios) { gap = 5.5; //开发工具中ios手机 } else { gap = 7.5; //开发工具中android和其他手机 } } else { gap = 4; width = 88; } if (!systemInfo.statusBarHeight) { //开启wifi的情况下修复statusBarHeight值获取不到 systemInfo.statusBarHeight = systemInfo.screenHeight - systemInfo.windowHeight - 20; } rect = { //获取不到胶囊信息就自定义重置一个 bottom: systemInfo.statusBarHeight + gap + 32, height: 32, left: systemInfo.windowWidth - width - 10, right: systemInfo.windowWidth - 10, top: systemInfo.statusBarHeight + gap, width: width }; console.log('error', error); console.log('rect', rect); } let navBarHeight = ''; if (!systemInfo.statusBarHeight) { //开启wifi和打电话下 systemInfo.statusBarHeight = systemInfo.screenHeight - systemInfo.windowHeight - 20; navBarHeight = (function () { let gap = rect.top - systemInfo.statusBarHeight; return 2 * gap + rect.height; })(); systemInfo.statusBarHeight = 0; systemInfo.navBarExtendHeight = 0; //下方扩展4像素高度 防止下方边距太小 } else { navBarHeight = (function () { let gap = rect.top - systemInfo.statusBarHeight; return systemInfo.statusBarHeight + 2 * gap + rect.height; })(); if (ios) { systemInfo.navBarExtendHeight = 4; //下方扩展4像素高度 防止下方边距太小 } else { systemInfo.navBarExtendHeight = 0; } } systemInfo.navBarHeight = navBarHeight; //导航栏高度不包括statusBarHeight systemInfo.capsulePosition = rect; //右上角胶囊按钮信息bottom: 58 height: 32 left: 317 right: 404 top: 26 width: 87 目前发现在大多机型都是固定值 为防止不一样所以会使用动态值来计算nav元素大小 systemInfo.ios = ios; //是否ios Taro.globalSystemInfo = systemInfo; //将信息保存到全局变量中,后边再用就不用重新异步获取了 //console.log('systemInfo', systemInfo); return systemInfo; }}let globalSystemInfo = getSystemInfo();class NavBar extends Component { constructor(props) { super(props); this.state = { configStyle: this.setStyle(globalSystemInfo) }; } static options = { multipleSlots: true, addGlobalClass: true }; UNSAFE_componentWillMount () { //获取高度 // let query = Taro.createSelectorQuery().in(this.$scope) // query.select('.lxy-nav-bar').boundingClientRect(rect=>{ // const navHeight = rect.height // this.props.personalHomeMod.changeState('navHeight',navHeight) // // console.log('navHeight',toJS(this.props.personalHomeMod.state)) // }).exec() } componentDidShow () { if (globalSystemInfo.ios) { globalSystemInfo = getSystemInfo(); this.setState({ configStyle: this.setStyle(globalSystemInfo) }); } } handleBackClick () { if (isFunction(this.props.onBack)) { this.props.onBack(); } else { const pages = Taro.getCurrentPages(); if (pages.length >= 2) { Taro.navigateBack({ delta: this.props.delta }); } } } handleGoHomeClick () { if (isFunction(this.props.onHome)) { this.props.onHome(); } } handleSearchClick () { if (isFunction(this.props.onSearch)) { this.props.onSearch(); } } static defaultProps = { extClass: '', background: 'rgba(255,255,255,1)', //导航栏背景 color: '#000000', title: '', searchText: '点我搜索', searchBar: false, back: false, home: false, iconTheme: 'black', delta: 1 }; setStyle (systemInfo) { const { statusBarHeight, navBarHeight, capsulePosition, navBarExtendHeight, ios, windowWidth } = systemInfo; const { back, home, title, color } = this.props; let rightDistance = windowWidth - capsulePosition.right; //胶囊按钮右侧到屏幕右侧的边距 let leftWidth = windowWidth - capsulePosition.left; //胶囊按钮左侧到屏幕右侧的边距 let navigationbarinnerStyle = [ `color:${color}`, //`background:${background}`, `height:${navBarHeight + navBarExtendHeight}px`, `padding-top:${statusBarHeight}px`, `padding-right:${leftWidth}px`, `padding-bottom:${navBarExtendHeight}px` ].join(';'); let navBarLeft; if ((back && !home) || (!back && home)) { navBarLeft = [ `width:${capsulePosition.width}px`, `height:${capsulePosition.height}px`, `margin-left:0px`, `margin-right:${rightDistance}px` ].join(';'); } else if ((back && home) || title) { navBarLeft = [ `width:${capsulePosition.width}px`, `height:${capsulePosition.height}px`, `margin-left:${rightDistance}px` ].join(';'); } else { navBarLeft = [`width:auto`, `margin-left:0px`].join(';'); } return { navigationbarinnerStyle, navBarLeft, navBarHeight, capsulePosition, navBarExtendHeight, ios, rightDistance }; } render () { const { navigationbarinnerStyle, navBarLeft, navBarHeight, capsulePosition, navBarExtendHeight, ios, rightDistance } = this.state.configStyle; const { title, background, backgroundColorTop, back, home, searchBar, searchText, iconTheme, extClass } = this.props; let nav_bar__center; if (title) { nav_bar__center = <text>{title}</text>; } else if (searchBar) { nav_bar__center = ( <View className='lxy-nav-bar-search' style={`height:${capsulePosition.height}px;`} onClick={this.handleSearchClick.bind(this)} > <View className='lxy-nav-bar-search__icon' /> <View className='lxy-nav-bar-search__input'>{searchText}</View> </View> ); } else { nav_bar__center = this.props.renderCenter; } return ( <View className={`lxy-nav-bar ${ios ? 'ios' : 'android'} ${extClass}`} style={`background: ${backgroundColorTop ? backgroundColorTop : background};height:${navBarHeight + navBarExtendHeight}px;`} > <View className={`lxy-nav-bar__placeholder ${ios ? 'ios' : 'android'}`} style={`padding-top: ${navBarHeight + navBarExtendHeight}px;`} /> <View className={`lxy-nav-bar__inner ${ios ? 'ios' : 'android'}`} style={`background:${background};${navigationbarinnerStyle};`} > <View className='lxy-nav-bar__left' style={navBarLeft}> {back && !home && ( <View onClick={this.handleBackClick.bind(this)} className={`lxy-nav-bar__button lxy-nav-bar__btn_goback ${iconTheme}`} /> )} {!back && home && ( <View onClick={this.handleGoHomeClick.bind(this)} className={`lxy-nav-bar__button lxy-nav-bar__btn_gohome ${iconTheme}`} /> )} {back && home && ( <View className={`lxy-nav-bar__buttons ${ios ? 'ios' : 'android'}`}> <View onClick={this.handleBackClick.bind(this)} className={`lxy-nav-bar__button lxy-nav-bar__btn_goback ${iconTheme}`} /> <View onClick={this.handleGoHomeClick.bind(this)} className={`lxy-nav-bar__button lxy-nav-bar__btn_gohome ${iconTheme}}`} /> </View> )} {!back && !home && this.props.renderLeft} </View> <View className='lxy-nav-bar__center' style={`padding-left: ${rightDistance}px`}> {nav_bar__center} </View> <View className='lxy-nav-bar__right' style={`margin-right: ${rightDistance}px`}> {this.props.renderRight} </View> </View> </View> ); }}export default NavBar;

2、NavBar.less

view,text,scroll-view,input,button,image,cover-view { box-sizing: border-box;}page { --height: 44PX; /* 4*2+32 */ --right: 97PX; --navBarExtendHeight: 4PX; --navBarHeight: 68PX; box-sizing: border-box;}.lxy-nav-bar .ios { --height: 44PX; /* 4*2+32 */ --right: 97PX; --navBarExtendHeight: 4PX; box-sizing: border-box;}.lxy-nav-bar .android { --height: 48PX; /* 8*2+32 */ --right: 96PX; --navBarExtendHeight: 4PX; box-sizing: border-box;}.lxy-nav-bar .devtools { --height: 42PX; /* 5*2+32 */ --right: 88PX; --navBarExtendHeight: 4PX; box-sizing: border-box;}.lxy-nav-bar__inner { position: fixed; top: 0; left: 0; z-index: 5001; height: var(--navBarHeight); display: flex; align-items: center; padding-right: var(--right); width: 100%; padding-top: 20PX; padding-bottom:4PX; .placeholder { position: absolute; top: 0; left: 0; width: 100%; }}.lxy-nav-bar__inner .lxy-nav-bar__left { position: relative; width: var(--right); height: 32PX; margin-left:10PX; display: flex; align-items: center;}.lxy-nav-bar__buttons { height: 100%; width: 100%; display: flex; align-items: center; border-radius: 16PX; border: 1px solid rgba(204, 204, 204, 0.6); position: relative;}.lxy-nav-bar__buttons.android { border: 1px solid rgba(234, 234, 234, 0.6);}.lxy-nav-bar__buttons::after { position: absolute; content: ''; width: 1px; height: 18.4PX; background: rgba(204, 204, 204, 0.6); left: 50%; top: 50%; transform: translate(-50%, -50%);}.lxy-nav-bar__buttons.android::after { background: rgba(234, 234, 234, 0.6);}.lxy-nav-bar__button { width: 50%; height: 100%; display: flex; font-size: 12PX; background-repeat: no-repeat; background-position: center center; background-size: 1em 2em;}.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback:active,.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome:active { opacity: 0.5;}.lxy-nav-bar__inner .lxy-nav-bar__center { font-size: 17PX; line-height: 17PX; text-align: center; position: relative; flex: 1; display: -webkit-box; display: -webkit-flex; display: flex; align-items: center; justify-content: center; padding-left: 10PX; text { margin-top: -2px; font-size:34px; font-weight:550; line-height:44px; }}.lxy-nav-bar__inner .lxy-nav-bar__loading { font-size: 0;}.lxy-nav-bar__inner .lxy-nav-bar__loading .lxy-loading { margin-left: 0;}.lxy-nav-bar__inner .lxy-nav-bar__right { margin-right: 10PX;}.lxy-nav-bar__placeholder { height: var(--navBarHeight); background: #f8f8f8; position: relative; z-index: 50; visibility: hidden;}.lxy-nav-bar-search { width: 100%; height: 100%; display: flex; justify-content: center; align-items: center; width: 100%; height: 32PX; border-radius: 16PX; position: relative; background: #f6f6f6;}.lxy-nav-bar-search__input { height: 100%; display: flex; align-items: center; color: #999; font-size: 15PX; line-height: 15PX;}.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback { background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='24' viewBox='0 0 12 24'%3E %3Cpath fill-opacity='.9' fill-rule='evenodd' d='M10 19.438L8.955 20.5l-7.666-7.79a1.02 1.02 0 0 1 0-1.42L8.955 3.5 10 4.563 2.682 12 10 19.438z'/%3E%3C/svg%3E");}.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_goback.white { background-image: url("data:image/svg+xml;charset=utf8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='24' viewBox='0 0 12 24'%3E %3Cpath fill-opacity='.9' fill-rule='evenodd' d='M10 19.438L8.955 20.5l-7.666-7.79a1.02 1.02 0 0 1 0-1.42L8.955 3.5 10 4.563 2.682 12 10 19.438z' fill='%23ffffff'/%3E%3C/svg%3E");}.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome { background-image: url("data:image/svg+xml,%3Csvg t='1565752242401' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='4326' width='48' height='48'%3E%3Cpath d='M537.13744054-106.18008097999996c-12.56871953-12.56871953-31.42179957-12.56871953-50.27488108 0L28.10427953 195.46919964000006c-12.56871953 12.56871953-18.85308003 25.13744054-18.85308003 37.70616005l0 609.58292171c0 25.13744054 18.85308003 43.99052059 43.9905191 43.9905191l301.6492806 0c18.85308004 0 31.42179957-12.56871953 31.42180105-31.42179957l0-314.21800013c0-18.85308004 12.56871953-31.42179957 31.42179956-31.42180105l188.53080038 0c18.85308004 0 31.42179957 12.56871953 31.42179956 31.42180105l0 314.21800013c0 18.85308004 12.56871953 31.42179957 31.42180105 31.42179957L970.7582814 886.7488005c25.13744054 0 43.99052059-18.85308003 43.9905191-43.9905191L1014.7488005 233.17535969000005c0-12.56871953-6.2843605-25.13744054-18.85308003-37.70616005l-458.75827993-301.64928062z' fill='%23000000' p-id='4327'%3E%3C/path%3E%3C/svg%3E"); background-size: 17PX 34PX; margin-top: 10px;}.lxy-nav-bar__inner .lxy-nav-bar__left .lxy-nav-bar__btn_gohome.white { background-image: url("data:image/svg+xml,%3Csvg t='1565752242401' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='4326' width='48' height='48'%3E%3Cpath d='M537.13744054-106.18008097999996c-12.56871953-12.56871953-31.42179957-12.56871953-50.27488108 0L28.10427953 195.46919964000006c-12.56871953 12.56871953-18.85308003 25.13744054-18.85308003 37.70616005l0 609.58292171c0 25.13744054 18.85308003 43.99052059 43.9905191 43.9905191l301.6492806 0c18.85308004 0 31.42179957-12.56871953 31.42180105-31.42179957l0-314.21800013c0-18.85308004 12.56871953-31.42179957 31.42179956-31.42180105l188.53080038 0c18.85308004 0 31.42179957 12.56871953 31.42179956 31.42180105l0 314.21800013c0 18.85308004 12.56871953 31.42179957 31.42180105 31.42179957L970.7582814 886.7488005c25.13744054 0 43.99052059-18.85308003 43.9905191-43.9905191L1014.7488005 233.17535969000005c0-12.56871953-6.2843605-25.13744054-18.85308003-37.70616005l-458.75827993-301.64928062z' fill='%23ffffff' p-id='4327'%3E%3C/path%3E%3C/svg%3E"); background-size: 17PX 34PX; margin-top: 10px;}.lxy-nav-bar-search__icon { width: 22PX; height: 22PX; display: flex; align-items: center; justify-content: center; background-image: url("data:image/svg+xml,%3Csvg t='1565691512239' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='1240' width='48' height='48'%3E%3Cpath d='M819.2 798.254545L674.909091 653.963636c46.545455-48.872727 74.472727-114.036364 74.472727-186.181818 0-151.272727-123.345455-274.618182-274.618182-274.618182-151.272727 0-274.618182 123.345455-274.618181 274.618182 0 151.272727 123.345455 274.618182 274.618181 274.618182 65.163636 0 128-23.272727 174.545455-62.836364l144.290909 144.290909c2.327273 2.327273 6.981818 4.654545 11.636364 4.654546s9.309091-2.327273 11.636363-4.654546c6.981818-6.981818 6.981818-18.618182 2.327273-25.6zM235.054545 467.781818c0-132.654545 107.054545-239.709091 239.709091-239.709091 132.654545 0 239.709091 107.054545 239.709091 239.709091 0 132.654545-107.054545 239.709091-239.709091 239.709091-132.654545 0-239.709091-107.054545-239.709091-239.709091z' fill='%23999999' p-id='1241'%3E%3C/path%3E%3C/svg%3E"); background-repeat: no-repeat; background-size: cover;}input{ padding:0 20px !important; text-align: start !important;}

属性：

slot:

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