Search搜索框如何配置？

build() {
  Column({ space: 15 }) {
    Search({ value: "", placeholder: "关键词搜索", })
      .searchIcon({ src: $r("app.media.startIcon") })
      .fontColor(Color.Gray)
      .caretStyle({width:2,color:Color.Orange})
      .searchButton("搜索")
      .cancelButton({style:CancelButtonStyle.INPUT})
      .margin(20)
  }.width('100%')
  .height("100%")
  .justifyContent(FlexAlign.Center)
}