this.state.ljtemp = '911';
this.setState({ ljtemp: 'sww' },() => {
console.log(this.state.ljtemp);
});// 打印内容：sww
this.state.ljtemp = '911';
this.setState({ ljtemp: 'sww' },() => {
console.log(this.state.ljtemp);
});// 打印内容：sww
