[React]propsの個数を指定する ref: http://qiita.com/khrtz/items/803063260b31ec693d31

file0.txt

// item-list.jsx

import Item from './item.jsx'

propTypes() {
    itemLimit: React.PropTypes.number
    }

    render() {
        var items = this.props.data.map((items, i) => {
        if (!this.props.itemLimit || i< this.props.itemLimit){
        return (<Item name={item.name}>);
    }
    }.bind(this));

    return( <div className="itembox">
                {items}
             </div>

file1.txt

// index.jsx

import ItemList from './item-list.jsx'


return (
<ItemList data={this.props.data} itemLimit={10} />
);