微信小程序自定义头部导航栏（组件化）

"window": {
 "navigationStyle": "custom"
 } 

<view class="cu-custom" style="height:{{CustomBar}}px">
 <view class="cu-bar {{bgImage!=''" style="height:{{CustomBar}}px;padding-top:{{StatusBar}}px;{{bgImage">
 <view class="action" bindtap="BackPage" wx:if="{{!isShare && isBack}}">
  <text class="icon-back"></text>
  <slot name="backText"></slot>
 </view>
 <view class="action border-custom" wx:if="{{isShare && isBack}}" style="width:{{Custom.width}}px;height:{{Custom.height}}px;margin-left:calc(750rpx - {{Custom.right}}px)">
  <text class="icon-back" bindtap="BackPage"></text>
  <text class="icon-homefill" bindtap="toHome"></text>
 </view>
 <view class="content" style="top:{{StatusBar}}px">
  <slot name="content"></slot>
 </view>
 </view>
</view>

.cu-custom { display: block; position: relative; }
.cu-custom .cu-bar {display: flex; align-items: center; justify-content: space-between;position: fixed; width: 100%; top: 0; min-height: 100rpx; padding-right: 220rpx; box-shadow: 0rpx 0rpx 0rpx; z-index: 9999; background-color: #fff; }
.cu-custom .cu-bar .border-custom { position: relative; background: rgba(255,255,255,0.5); border-radius: 1000rpx; height: 30px; }
.cu-custom .cu-bar .action { display: flex; align-items: center; height: 100%; justify-content: center; max-width: 100%; }
.cu-custom .cu-bar .action:first-child { margin-left: 30rpx; font-size: 30rpx; }
.cu-custom .cu-bar .border-custom text { display: block; flex: 1; margin: auto !important; text-align: center; font-size: 34rpx; }
.cu-bar .content { width: calc(100% - 440rpx);position: absolute; text-align: center; left: 0; right: 0; bottom: 0; top: 0; margin: auto; height: 60rpx; font-size: 32rpx; line-height: 60rpx; cursor: none; pointer-events: none; text-overflow: ellipsis; white-space: nowrap; overflow: hidden; }

const App = getApp();
Component({
 options: {
 addGlobalClass: true,
 multipleSlots: true
 },
 properties: {
 isBack: {
 type: [Boolean, String],
 default: false
 },
 bgColor: { // 类名
  type: String,
  default: ''
  }, 
  bgImage: { // 仅支持网络地址
  type: String,
  default: ''
  },
 },
 data: {
 StatusBar: App.GlobalData.StatusBar,
 CustomBar: App.GlobalData.CustomBar,
 Custom: App.GlobalData.Custom,
 isShare: App.GlobalData.share
 },
 methods: {
 BackPage() {
 wx.navigateBack({
 delta: 1
 });
 },
 toHome() {
 wx.reLaunch({
 url: '/pages/index/index',
 })
 }
 }
})

App({
 GlobalData: {
 share: false,
 StatusBar: 0,
 Custom: 0,
 CustomBar: 0
 },
 onLaunch: function () {
 let self = this
 let systemInfo = wx.getSystemInfoSync()
 self.GlobalData.StatusBar = systemInfo.statusBarHeight;
 if (wx.getMenuButtonBoundingClientRect) {
 let custom = wx.getMenuButtonBoundingClientRect();
 self.GlobalData.Custom = custom;
 self.GlobalData.CustomBar = custom.bottom + custom.top - systemInfo.statusBarHeight;
 }
 })

/* 自定义头部导航栏图标 */
.cu-custom [class*="icon-"] { font-family: "iconfont" !important; font-size: inherit; font-style: normal; }

@font-face {font-family: "iconfont";
 src: url('iconfont.eot"iconfont" !important;font-size: 16px;font-style: normal;-webkit-font-smoothing: antialiased;-moz-osx-font-smoothing: grayscale; }
.icon-homefill:before { content: "\e6fc"; }
.icon-back:before { content: "\e67a"; }
.cu-custom .cu-bar .border-custom::after { content: " "; width: 200%; height: 200%; position: absolute; top: 0; left: 0; border-radius: inherit; transform: scale(0.5); transform-origin: 0 0; pointer-events: none; box-sizing: border-box; border: 1rpx solid rgba(0,0,0,0.3); opacity: 0.5; }
.cu-custom .cu-bar .border-custom::before { content: " "; width: 1rpx; height: 110%; position: absolute; top: 22.5%; left: 0; right: 0; margin: auto; transform: scale(0.5); transform-origin: 0 0; pointer-events: none; box-sizing: border-box; opacity: 0.6; background-color: rgba(0,0,0,0.3); }