#### 2.className ```javascript <h1 className="title"></h1> ``` #### 3.变量表达式等 ```javascript <div>{title}</div> <div>{this.props.title.toLowerCase()}</div> ``` #### 4.数组映射 ```javascript <ul> { this.props.lis.map((li)=>{ <li key={i}>{li.content}</li> }) } </ul> ```