在頁面中實現(xiàn)自定義頭部導航的組件，如果僅是單個頁面中需要自定義可在頁面的json文件中配置"navigationStyle": “custom”，如果是項目中所有頁面都想使用自定義的組件，可在app.json的window中全局配置"navigationStyle": “custom”。
先分析頭部導航的組成，可參考圖1

其組成主要包含兩部分：狀態(tài)欄、導航區(qū)域，下面分別說說這兩部分的高度如何獲取。
1、獲取狀態(tài)欄高度
對于不同的機型而言，狀態(tài)欄的高度是有所差異的，可通過wx.getSystemInfo來獲取，但需要注意的是該接口在基礎庫2.20.1后就停止維護，需要改用wx.getWindowInfo獲取。
（1）使用wx.getSystemInfo獲取示例代碼

wx.getSystemInfo({success: (res) => {this.setData({statusBarHeight: res.statusBarHeight })}
})

（2）使用wx.getWindowInfo示例代碼

 constres = wx.getWindowInfo()this.setData({statusBarHeight: res.statusBarHeight })

2、導航區(qū)域高度
（1）導航區(qū)域的高度可自己定義，但考慮到右側膠囊，為使得標題位置垂直居中，因而導航區(qū)域的高度實際也需要計算得出。其公式為：導航區(qū)域的高度 = 膠囊的高度 + 膠囊距離狀態(tài)欄的高度 * 2。

// 獲取菜單按鈕（右上角膠囊按鈕）的布局位置信息。坐標信息以屏幕左上角為原點。
const rect = wx.getMenuButtonBoundingClientRect()
console.log('右上角膠囊按鈕）布局', rect);

// 獲取菜單按鈕（右上角膠囊按鈕）的布局位置信息。坐標信息以屏幕左上角為原點。
const rect = wx.getMenuButtonBoundingClientRect()
console.log('右上角膠囊按鈕）布局', rect);
wx.getSystemInfo({success: (res) => {this.setData({navBarHeight: rect.bottom - rect.top + (rect.top - res.statusBarHeight) * 2, // navBarHeight: rect.height + (rect.top - res.statusBarHeight) * 2, })}
})

（2）考慮到膠囊位置，因而導航欄區(qū)域可自定義的寬度需減去膠囊的寬度，使用padding-right的方式占用膠囊的寬，注意需要設置為box-sizing: border-box，懂得都懂。

// 獲取菜單按鈕（右上角膠囊按鈕）的布局位置信息。坐標信息以屏幕左上角為原點。const rect = wx.getMenuButtonBoundingClientRect()console.log('右上角膠囊按鈕）布局', rect);wx.getSystemInfo({success: (res) => {this.setData({innerPaddingRight: `padding-right:${res.windowWidth - rect.left}px`,})}})

（3）剩余的寬度你就可以自由發(fā)揮了。
以下是組件參考代碼
index.xml

<view class="weui-navigation-bar {{extClass}}"><view class="status-bar" style="height: {{statusBarHeight}}px; color: {{color}}; background: {{background}}"></view><view class="weui-navigation-bar__inner" style="height: {{navBarHeight}}px; color: {{color}}; background: {{background}}; {{displayStyle}}; {{innerPaddingRight}}"><view class='weui-navigation-bar__left' style="{{leftWidth}}"><block wx:if="{{back}}"><view class="navigation-bar__buttons" bindtap="back"><view class="navigation-bar__button navigation-bar__btn_goback" hover-class="active"></view></view></block><block wx:else><slot name="left"></slot></block></view><view class='weui-navigation-bar__center'><view wx:if="{{loading}}" class="weui-navigation-bar__loading" aria-role="alert"><view class="weui-loading" style="width:{{size.width}}rpx;height:{{size.height}}rpx;" aria-role="img" aria-label="加載中"></view></view><block wx:if="{{title}}"><text>{{title}}</text></block><block wx:else><slot name="center"></slot></block></view><view class='weui-navigation-bar__right'><slot name="right"></slot></view></view>
</view>

index.wxss

.weui-navigation-bar {overflow: hidden;color: rgba(0, 0, 0, .9);width: 100vw;
}
.status-bar{width: 100%;
}
.weui-navigation-bar__placeholder {background: #f7f7f7;position: relative;
}
.weui-navigation-bar__inner, .weui-navigation-bar__inner .weui-navigation-bar__left {display: flex;align-items: center;flex-direction: row;
}
.weui-navigation-bar__inner {position: relative;padding-right: 95px;width: 100vw;box-sizing: border-box;padding-top: env(safe-area-inset-top);
}
.weui-navigation-bar__inner .weui-navigation-bar__left {position: relative;width: 95px;padding-left: 16px;box-sizing: border-box;
}
.weui-navigation-bar__btn_goback_wrapper {padding: 11px 18px 11px 16px;margin: -11px -18px -11px -16px;
}
.weui-navigation-bar__inner .weui-navigation-bar__left .navigation-bar__btn_goback {font-size: 12px;width: 12px;height: 24px;background: 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") no-repeat 50% 50%;background-size: cover;
}
.weui-navigation-bar__inner .weui-navigation-bar__center {font-size: 17px;text-align: center;position: relative;flex: 1;display: flex;flex-direction: column;align-items: center;justify-content: center;font-weight: bold;
}
@media(prefers-color-scheme: dark) {.weui-navigation-bar {color: hsla(0, 0%, 100%, .8);}.weui-navigation-bar__inner {background-color: #1f1f1f;}
}

index.js

Component({options: {multipleSlots: true // 在組件定義時的選項中啟用多slot支持},/*** 組件的屬性列表*/properties: {extClass: {type: String,value: ''},title: {type: String,value: ''},background: {type: String,value: '#fff'},color: {type: String,value: '#000'},back: {type: Boolean,value: true},loading: {type: Boolean,value: false},animated: {// 顯示隱藏的時候opacity動畫效果type: Boolean,value: true},show: {// 顯示隱藏導航，隱藏的時候navigation-bar的高度占位還在type: Boolean,value: true,observer: '_showChange'},// back為true的時候，返回的頁面深度delta: {type: Number,value: 1}},/*** 組件的初始數(shù)據*/data: {displayStyle: '',statusBarHeight: 20},attached() {// 獲取菜單按鈕（右上角膠囊按鈕）的布局位置信息。坐標信息以屏幕左上角為原點。const rect = wx.getMenuButtonBoundingClientRect()// console.log('右上角膠囊按鈕）布局', rect);wx.getSystemInfo({success: (res) => {this.setData({innerPaddingRight: `padding-right:${res.windowWidth - rect.left}px`,leftWidth: `width:${res.windowWidth - rect.left}px`,// navBarHeight: rect.bottom + rect.top  - res.statusBarHeight,  //84pxnavBarHeight: rect.bottom - rect.top + (rect.top - res.statusBarHeight) * 2, //40pxstatusBarHeight: res.statusBarHeight //44px})}})},/*** 組件的方法列表*/methods: {_showChange(show) {const animated = this.data.animatedlet displayStyle = ''if (animated) {displayStyle = `opacity: ${show ? '1' : '0'};transition: opacity 0.5s;`} else {displayStyle = `display: ${show ? '' : 'none'}`}this.setData({displayStyle})},back() {const data = this.dataif (data.delta) {wx.navigateBack({delta: data.delta})}this.triggerEvent('back', { delta: data.delta }, {})}}})

index.json

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

在頁面中使用該組件
page.json

{"usingComponents": {"zxm-navigation-bar": "/components/zxm-navigation-bar" //該成你所放組件的路徑喲},"navigationStyle": "custom","disableScroll": true
}

page.wxml

<view><zxm-navigation-bar title="標題"></zxm-navigation-bar>
</view>

代碼也可前往這里下載