Checkbox
语法，$$绑定的变量发生变化时，会触发UI的刷新 ```javascript @Entry @Component struct MvvmCase { @State isMarry:boolean = false @State searchText:string = '' build() { Grid(){ GridItem(){ Column(){ Text("checkbox 的双向绑定") Checkbox() .select($$this.isMarry) Text(this.isMarry+"") Button('改变') .onClick(()=>{ this.isMarry=!this.isMarry }) } } .height(200) .backgroundColor(Color.Yellow) } .width('100%') .height('100%') .columnsTemplate("1fr 1fr") .columnsGap(20) .rowsGap(20) } } ```  #### Search  ```javascript @Entry @Component struct MvvmCase { @State isMarry:boolean = false @State searchText:string = '' build() { Grid(){ GridItem(){ Column(){ Text("search 的双向绑定") Search({value:$$this.searchText}) Text(this.searchText+"") Button('改变') .onClick(()=>{ this.searchText='老宋你好' }) } } .height(200) .backgroundColor(Color.Pink) } .width('100%') .height('100%') .columnsTemplate("1fr 1fr") .columnsGap(20) .rowsGap(20) } } ```   #### TextInput  @Entry @Component struct MvvmCase { @State isMarry:boolean = false @State searchText:string = '' controller: TextInputController = new TextInputController() build() { Grid(){ GridItem(){ Column(){ Text("TextInput 的双向绑定") TextInput({ text: $$this.searchText, placeholder: 'TextInput 的双向绑定', controller: this.controller }) Text(this.searchText+"") Button('改变') .onClick(()=>{ this.searchText='老宋你好01' }) } } .height(200) .backgroundColor(Color.Pink) } .width('100%') .height('100%') .columnsTemplate("1fr 1fr") .columnsGap(20) .rowsGap(20) } }  还有很多组件都支持双向绑定 