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### ArkTS数据绑定和事件
ArkTS负责数据维护和交互
ArkUI负责页面布局
#### 示例焦点技术onBlur和初识双向绑定
```js
@ Entry
@ Component
struct Index {
@ State message : string = 'Hello World' ;
checkMe = ()=>{
this . message = "harmonyos"
}
// inputEvent = (event:ClickEvent)=>{
//
// }
build () {
RelativeContainer () {
Column (){
Text ( this . message )
Button ( "点击" ). onClick ( this . checkMe )
. width ( '100' )
. stateEffect ( true )
TextInput ({ placeholder : '请输入内容 ' , text : $$this . message }). onBlur (()=>{
console . log ( "231" )
})
TextInput ()
}
}
. height ( '100%' )
. width ( '100%' )
}
}
```
### 实战任务小程序
1. ##### 布局单位
不是px，
物理像素 px
逻辑像素
鸿蒙提供多种布局单位
px以分辨率为参考
vp屏幕密度相关像素
fp字体像素
lpx视窗逻辑像素
2. ##### Column和Row布局
Column默认垂直方向为主轴，
Row默认水平方向为主轴，
