react state不更新更新

Question

tab切换的时候更新当前选择的tab，debugger发现state并没有更新，请问具体原因是什么，万分感谢！constructor(props) {     super(props)     this.state = {       selected: 'blacklist'     }   }tabChange(newSelected) {  // newSelected = "score"     const {selected} = this.state; // selected = "blacklist"     debugger     if (selected !== newSelected) { // selected = "blacklist", newSelected = "score"       this.setState({         selected: newSelected,       })       const {tabChange} = this.props       tabChange(newSelected)     }     debugger     const state = this.state //state = {selected: "blacklist",}     console.log(state)   }

Answer 1

setState 是异步的. 你需要在回调里回去获取更新后的 state.

this.setState({  selected: newSelected,
}, function() {    console.log(this.state)
});