How to set the Props attribute

Props (properties)

are the properties of the component itself. The properties in props correspond to the component properties one-to-one. Responsible for transmitting information

1. Pass data from parent component to child component

//定义webName组件，负责输出名字
var webName = React.createClass({
  render : function() {
    return <h1>{this.props.webname} </h1>;
  }
})
//定义webLink组件，负责跳转链接
var webLink = React.createClass({
  render : function() {
    return <a href={this.props.weblink}>{this.props.weblink}</a>
  }
})
 
var webShow = React.createClass({
  render : function(){
    <div>
      <webName webname={this.props.webname}/>
      <webLink weblink={this.props.weblink}/>
    </div>
  }
})
 
//渲染
ReactDom.render{
  return function() {
    <webShow webname = "hellp" weblink = "www.baidu.com" />,
      document.getElementById("container")
  }
}

2. Set default attributes

through static defaultProps = {} is a fixed format to add default properties to a component

export default class MyView extends Component {
  static defaultProps = {
    age: 12,
    sex: '男'
  }
 
  render() {
    return <Text
        style={{backgroundColor: &#39;cyan&#39;}}>
      你好{this.props.name}{&#39;\n&#39;}年龄{this.props.age}{&#39;\n&#39;}性别{this.props.sex}
    </Text>
  }
}

3. Attribute checking

is done through static propTypes = {}. Set the format of the attribute, for example, we set age to number type

var title = React.createClass({
  propTypes={
    //title类型必须是字符串
    title : React.PropTypes.string.isRequired
  },
  render : function() {
    return <h1>{this.props.title}</h1>
  }
})

Extension operator... is a new feature of ES6 syntax. ...this.porps, a syntax that copies all properties in the parent component to the child component

2 The parent component passes the calling function to the child component to notify the parent component of the message.

3 Used as a mark for logical judgment of sub-components, rendering styles, etc.

4 children, which is not an attribute corresponding to the component, represents all child nodes of the component.

//定义webName组件，负责输出名字
var listCompont = React.createClass({
  render : function() {
    return
    <ul>
      {
        /**
         * 列表项内容不固定，需要在创建模版时确定。利用this.props.children传递显示内容
         * 获取到内容后，需要遍历children，逐项设置。利用React.Children.map方法
         **/
 
        React.Children.map(this.props.children,function(child) {
            //child是遍历得到父组件子节点
            return <li>{child}</li>;
        })
      }
    </ul>;
  }
})
//渲染
ReactDom.render{
  {
    <listCompont>
      <h1>hello</h1>
      <a href="link">"www.baidu.com"</a>
    </listCompont>
  },
document.getElementById("container")
}

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