1.Hello,world!

ReactDOM.render(
    <h1>Hello,world!</h1>,document.getElementById('example')
);

2.遍历数组

var names = ['Alice','Emily','Kate'];
ReactDOM.render(
    <div>
    {
      names.map(function (name) {
        return <div>Hello,{name}!</div>
      })
    }
    </div>,document.getElementById('example')
);

3.数组渲染

var arr = [
    <h1>Hello world!</h1>,<h2>React is awesome</h2>,];
ReactDOM.render(
    <div>{arr}</div>,document.getElementById('example')
);

4.属性值传递

var HelloMessage = React.createClass({
    render: function() {
      return <h1>Hello {this.props.name}</h1>;
    }
});
ReactDOM.render(
    <HelloMessage name="John" />,document.getElementById('example')
);

5.子元素传递

var NotesList = React.createClass({
    render: function() {
      return (
        <ol>
          {
            React.Children.map(this.props.children,function (child) {
              return <li>{child}</li>;
            })
          }
        </ol>
      );
    }
});

ReactDOM.render(
    <NotesList>
      <span>hello</span>
      <span>world</span>
    </NotesList>,document.body
);

6.属性类型限制

var data = 123;

var MyTitle = React.createClass({
    propTypes: {
      title: React.PropTypes.string.isrequired,},render: function() {
      return <h1> {this.props.title} </h1>;
    }
});

ReactDOM.render(
    <MyTitle title={data} />,document.body
);

7.事件

var MyComponent = React.createClass({
  handleClick: function() {
    this.refs.myTextInput.focus();
  },render: function() {
    return (
      <div>
        <input type="text" ref="myTextInput" />
        <input type="button" value="Focus the text input" onClick={this.handleClick} />
      </div>
    );
  }
});

ReactDOM.render(
  <MyComponent />,document.getElementById('example')
);

8.利用state制作LikeButton

var LikeButton = React.createClass({
    getInitialState: function() {
        return {liked: false};
    },handleClick: function(event) {
        this.setState({liked: !this.state.liked});
    },render: function() {
        var text = this.state.liked ? 'like' : 'haven\'t liked';
        return (
        <p onClick={this.handleClick}>
            You {text} this. Click to toggle.
        </p>
        );
    }
});

ReactDOM.render(
    <LikeButton />,document.getElementById('example')
);

9.利用state制作input

var Input = React.createClass({
    getInitialState: function() {
      return {value: 'Hello!'};
    },handleChange: function(event) {
      this.setState({value: event.target.value});
    },render: function () {
      var value = this.state.value;
      return (
        <div>
          <input type="text" value={value} onChange={this.handleChange} />
          <p>{value}</p>
        </div>
      );
    }
});

ReactDOM.render(<Input/>,document.body);

10.定时器

var Hello = React.createClass({
    getInitialState: function () {
      return {
        opacity: 1.0
      };
    },componentDidMount: function () {
      this.timer = setInterval(function () {
        var opacity = this.state.opacity;
        opacity -= .05;
        if (opacity < 0.1) {
          opacity = 1.0;
        }
        this.setState({
          opacity: opacity
        });
      }.bind(this),100);
    },render: function () {
      return (
        <div style={{opacity: this.state.opacity}}>
          Hello {this.props.name}
        </div>
      );
    }
});

ReactDOM.render(
    <Hello name="world"/>,document.body
);

11.与jquery配合实现ajax

var UserGist = React.createClass({
  getInitialState: function() {
    return {
      username: '',lastGistUrl: ''
    };
  },componentDidMount: function() {
    $.get(this.props.source,function(result) {
      var lastGist = result[0];
      if (this.isMounted()) {
        this.setState({
          username: lastGist.owner.login,lastGistUrl: lastGist.html_url
        });
      }
    }.bind(this));
  },render: function() {
    return (
      <div>
        {this.state.username}'s last gist is <a href={this.state.lastGistUrl}>here</a>.
      </div>
    );
  }
});

ReactDOM.render(
  <UserGist source="https://api.github.com/users/octocat/gists" />,document.body
);

12.利用state实现一个组件的loading/error画面

var RepoList = React.createClass({
  getInitialState: function() {
    return {
      loading: true,error: null,data: null
    };
  },componentDidMount() {
    this.props.promise.then(
      value => this.setState({loading: false,data: value}),error => this.setState({loading: false,error: error}));
  },render: function() {
    if (this.state.loading) {
      return <span>Loading...</span>;
    }
    else if (this.state.error !== null) {
      return <span>Error: {this.state.error.message}</span>;
    }
    else {
      var repos = this.state.data.items;
      var repoList = repos.map(function (repo) {
        return (
          <li><a href={repo.html_url}>{repo.name}</a> ({repo.stargazers_count} stars) <br/> {repo.description}</li>
        );
      });
      return (
        <main>
          <h1>Most Popular JavaScript Projects in Github</h1>
          <ol>{repoList}</ol>
        </main>
      );
    }
  }
});

ReactDOM.render(
  <RepoList promise={$.getJSON('https://api.github.com/search/repositories?q=javascript&sort=stars')} />,document.body
);