1.Functional and Class Components
They accept arbitrary inputs (called "props") and return React elements describing what should appear on the screen.
控件可以接受任意输入(叫做props),返回要显示在screen上的React 元素。
function Welcome(props) { return <h1>Hello,{props.name}</h1>; }
This function is a valid React component because it accepts a single "props" object argument with data and returns a React element. We call such components "functional" because they are literally JavaScript functions.
也可以用ES6的class来定义一个组件。用props来代表这个组件接受到的参数。class Welcome extends React.Component { render() { return <h1>Hello,{this.props.name}</h1>; } }
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