Javascript 如何在此数组中添加所有值?它';每次创建一个新的客户机阵列并向其推送值时
如何将当前值添加到以前的值,而不是替换它们Javascript 如何在此数组中添加所有值?它';每次创建一个新的客户机阵列并向其推送值时,javascript,arrays,reactjs,Javascript,Arrays,Reactjs,如何将当前值添加到以前的值,而不是替换它们 将值添加到CLIENT=[value1,value2]后,我希望它是CLIENT=[value1,value2,value3]您需要将以前的客户端状态合并或扩展到新状态: this.state = { CLIENT: [] } handleChange = (event) => { const value = event.target.value; this.setState({ CLIENT: [value] });
将值添加到
CLIENT=[value1,value2]
后,我希望它是CLIENT=[value1,value2,value3]
您需要将以前的客户端状态合并或扩展到新状态:
this.state = {
CLIENT: []
}
handleChange = (event) => {
const value = event.target.value;
this.setState({
CLIENT: [value]
});
};
handleChange = (event) => {
const value = event.target.value;
this.setState(prevState => ({
CLIENT: [...prevState.CLIENT, value]
}));
};