feat(web-view): 支持通过 webviewStyles 设置样式

src/platforms/app-plus/view/components/web-view/index.vue

@@ -12,17 +12,21 @@ import { NAVBAR_HEIGHT } from 'uni-helpers/constants'
 
 let webview = false
 const insertHTMLWebView = ({
+  webviewStyles,
   htmlId,
   updateTitle
 }) => {
   const parentWebview = plus.webview.currentWebview()
   // fixed by hxy web-view 组件所在的 webview 不注入 uni-app 框架
-  const styles = {
+  const styles = Object.assign(
+    {
       'uni-app': 'none',
       isUniH5: true,
       // ios 默认绘制到安全区外
       contentAdjust: false
-  }
+    },
+    webviewStyles
+  )
   const parentTitleNView = parentWebview.getTitleNView()
   if (parentTitleNView) {
     if (plus.navigator.isImmersedStatusbar()) {
@@ -102,6 +106,7 @@ export default {
   mounted () {
     this.htmlId = WEBVIEW_ID_PREFIX + this.$page.id
     insertHTMLWebView({
+      webviewStyles: this.webviewStyles,
       htmlId: this.htmlId,
       updateTitle: this.updateTitle
     })