Dva: 快速上手例子的bug

[zengyunchun]

上面没有return返回值，应该如下

const Products = (props) => (
  return <h2>List of Products</h2>;
);

[nalantianyi]

请学习下es6箭头函数，
传送门http://es6.ruanyifeng.com/#docs/function#%E7%AE%AD%E5%A4%B4%E5%87%BD%E6%95%B0

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