tab切換的時候更新當(dāng)前選擇的tab，debugger發(fā)現(xiàn)state并沒有更新，請問具體原因是什么，萬分感謝！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)
}
3 回答
官網(wǎng)原話，因為setSate最后會被合成，導(dǎo)致類似于異步
www說
TA貢獻(xiàn)1775條經(jīng)驗 獲得超8個贊
setState 是異步的. 你需要在回調(diào)里回去獲取更新后的 state.
this.setState({ selected: newSelected,
}, function() { console.log(this.state)
});
慕的地8271018
TA貢獻(xiàn)1796條經(jīng)驗 獲得超4個贊
react在生命周期和event handler里的setState會被合并（異步）處理。（17版本以后全都會變異步）
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