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更新文档 #76

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更新文档 #76

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4 changes: 1 addition & 3 deletions Ch04/props-state-introduction.md
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Original file line number Diff line number Diff line change
Expand Up @@ -112,8 +112,6 @@ app.js：
class Timer extends React.Component {
constructor(props) {
super(props);
// 與 ES5 React.createClass({}) 不同的是 component 內自定義的方法需要自行綁定 this context，或是使用 arrow function
this.tick = this.tick.bind(this);
// 初始 state，等於 ES5 中的 getInitialState
this.state = {
secondsElapsed: 0,
Expand All @@ -125,7 +123,7 @@ class Timer extends React.Component {
}
// componentDidMount 為 component 生命週期中階段 component 已插入節點的階段，通常一些非同步操作都會放置在這個階段。這便是每1秒鐘會去呼叫 tick 方法
componentDidMount() {
this.interval = setInterval(this.tick, 1000);
this.interval = setInterval(this.tick.bind(this), 1000);
}
// componentWillUnmount 為 component 生命週期中 component 即將移出插入的節點的階段。這邊移除了 setInterval 效力
componentWillUnmount() {
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