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componennt-lifecircle.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>change panel color</title>
<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.23/browser.js"></script>
<!--react library &reactDom-->
<script src="https://unpkg.com/[email protected]/dist/react.js"></script>
<script src="https://unpkg.com/[email protected]/dist/react-dom.js"></script>
<style type="text/css">
#container{
padding: 50px;
background-color: #fff;
}
</style>
</head>
<body>
<div id="container"></div>
<script type="text/babel">
var destination = document.querySelector("#container");
var Counter = React.createClass({
componentWillReceiveProps:function (newProps) {
console.log("componentWillReceiveProps:component will receive new props");
return;
},
shouldComponentUpdate:function (newPros,newState) {
console.log("shouldComponentUpdate:should counter update");
return true;
},
componentWillUpdate:function () {
console.log("componentWillUpdate:counter will update");
return true;
},
componentDidUpdate:function () {
console.log("componentDidUpdate:counter did update");
return;
},
render:function () {
var textStyle = {
fontSize:72,
fontFamily:"sans-serif",
color:"#333",
fontWeight:"bold"
};
return(
<div style={textStyle}>
{this.props.display}
</div>
)
}
});
var CounterParent = React.createClass({
getDefaultProps:function () {
console.log("getDefaultProps:receive props from outsize");
//like this.props
return {};
},
getInitialState:function () {
console.log("getInitialState:set defaule state object");
//like this.state
return {
count:0
};
},
componentWillMount:function () {
console.log("componentWillMount:component will about to mount");
return;
},
componentDidMount:function () {
console.log("componentDidMount:component did mount");
return;
},
increase:function () {
this.setState({
count:this.state.count+1
});
},
shouldComponentUpdate:function (newPros,newState) {
console.log("shouldComponentUpdate:should component update");
if(newState.count < 5){
console.log("component should update");
//must be returned
return true;
}else{
console.log("component should not update");
ReactDOM.unmountComponentAtNode(destination);
return false;
}
},
componentWillUnmount:function () {
console.log("componentWillUnmount:component will be removed from dom");
return;
},
componentWillUpdate:function () {
console.log("componentWillUpdate:component is about to update");
return;
},
componentDidUpdate:function () {
console.log("componentDidUpdate:component is just updated");
return;
},
render:function () {
var backgroundStyle = {
padding:50,
border:"#333 2px dotted",
width:250,
height:100,
borderRadius:10,
textAlign:"center"
};
return(
<div style={backgroundStyle}>
<Counter display={this.state.count}/>
<button onClick={this.increase}>
+
</button>
</div>
);
}
});
ReactDOM.render(
<div>
<CounterParent/>
</div>,
destination
);
</script>
</body>
</html>