react construct
constructor(props) {
super(props);
//...
}
react native class component constructor
import React from 'react';
import { View, TextInput } from "react-native";
class App extends React.Component {
constructor(props){
super(props);
this.state = {
name: ""
}
this.handleChange = this.handleChange.bind(this);
}
handleChange(text){
this.setState({ name: text })
console.log(this.props);
}
render() {
return (
<View>
<TextInput
value={this.state.name}
onChangeText={(text) =>this.handleChange(text)}
/>
</View>
}
}
export default App;
state react
class Example extends React.Component {
constructor(props) {
super(props);
this.state = {
count: 0
};
}
render() {
return (
<div>
<p>You clicked {this.state.count} times</p>
<button onClick={() => this.setState({ count: this.state.count + 1 })}>
Click me
</button>
</div>
);
}
}
shouldcomponentupdate
shouldComponentUpdate(nextProps, nextState) {
return true;
}
component did mmount
componentDidUpdate(prevProps, prevState, snapshot)
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