react--props

最後更新：2018-07-29 來源：互聯網

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一、react的props用以父組件向子組件傳遞參數

如下例所示：
1、propTypes用於驗證props的類型。
2、getDefaultProps用於設定props的預設值。
3、在父組件中通過屬性的方式，傳遞給子組件<SubMessage messages={this.state.subMessages}/>，子組件中使用this.props.messages得到父組件傳遞的messages值。

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>this</title>    <script type="text/javascript" src="bower_components/react/react.js"></script>    <script type="text/javascript" src="bower_components/react/JSXTransformer.js"></script></head><body>    <div id="app"></div>    <script type="text/jsx">        var MessageBox = React.createClass({            getInitialState: function(){                return {                    subMessages : [                        '我會寫代碼',                        '也會撒嬌',                        '老闆叫我回去搬磚'                    ]                };            },            render: function(){                return (                    <div>                                               <SubMessage messages={this.state.subMessages}/>                    </div>                );            }        });        var SubMessage = React.createClass({            propTypes:{                messages: React.PropTypes.array.isRequired,            },            getDefaultProps: function(){                return {                    messages: ['預設的子訊息']                };            },            render: function(){                var subMsg = [];                this.props.messages.forEach(function(val, index){                    subMsg.push(                        <p>碼農說：{val}</p>                    );                })                return (                    <div>{subMsg}</div>                );            }        });        React.render(            <MessageBox />,            document.getElementById('app')        );    </script></body></html>

二、this.props.children

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>demo2</title>    <script src="https://cdn.bootcss.com/react/15.4.2/react.min.js"></script>    <script src="https://cdn.bootcss.com/react/15.4.2/react-dom.min.js"></script>    <script src="https://cdn.bootcss.com/babel-standalone/6.22.1/babel.min.js"></script></head><body>    <div id="app"></div>    <script type="text/jsx">         var Comp = React.createClass({            render: function(){                console.log( React.Children.map);                var childComps = React.Children.map(this.props.children,function(child){                    return <li>{child}</li>;                })                return (                    <ol>                        {childComps}                    </ol>                );            }        });        ReactDOM.render(            <Comp>                <span>hello</span>                <span>nihao</span>            </Comp>,            document.getElementById('app')        );    </script></body></html>

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