bug修复

commons/basic/src/main/ets/components/HdSearchNav.ets

@@ -27,6 +27,8 @@ export struct HdSearchNav {
   rightbackColor: ResourceStr = $r('app.color.main_color')
   @Prop
   isFocus:boolean = false;
+  @Prop
+  placeholder:string = ''
 
   @State textInputContent:string = ''
 
@@ -43,7 +45,7 @@ export struct HdSearchNav {
         Image($r('app.media.selected_hospital_ws'))
           .width(20).height(20)
           .margin({left:10})
-        TextInput({placeholder:'搜索视频、过往会议'})
+        TextInput({placeholder:this.placeholder})
           .defaultFocus(this.isFocus)
           .fontSize(15)
           .backgroundColor(this.bgColor)