Created
July 16, 2017 18:55
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Clock items
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const React = require("react"); | |
const { render } = require("react-dom"); | |
const root = document.querySelector("#r"); | |
// const log = (text) => { | |
// document.querySelector("#log").textContent += "\n" + text; | |
// } | |
// const heavyCalc = () => { | |
// const start = Date.now(); | |
// while (Date.now() - start < 200) { } | |
// } | |
class Items extends React.Component { | |
render() { | |
const num = this.props.items ? this.props.items.length : 0; | |
return ( | |
<div> | |
<h2>items</h2> | |
<p>got {num} items</p> | |
</div> | |
) | |
} | |
} | |
class Clock extends React.Component { | |
constructor(props, context) { | |
super(props, context); | |
this.state = { | |
unix: Date.now(), | |
} | |
this.refreshClock = this.refreshClock.bind(this); | |
} | |
componentDidMount() { | |
setTimeout(this.refreshClock, 1000) | |
} | |
refreshClock() { | |
this.setState({ | |
unix: Date.now(), | |
}) | |
setTimeout(this.refreshClock, 1000) | |
} | |
render() { | |
return ( | |
<div style={{padding: "20px"}}> | |
<h1>unix timestamp is now: {this.state.unix}</h1> | |
<Items /> | |
</div> | |
) | |
} | |
} | |
// render(<Clock items={[1, 2]} />, root); | |
render(<Clock />, root); |
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