js错误集锦|js错误集锦函数在一个map循环遍历中进行返回值返回结果在调用该函数时收不到返回值 js错误集锦函数在一个map循环遍

【js错误集锦|js错误集锦函数在一个map循环遍历中进行返回值返回结果在调用该函数时收不到返回值】错误代码：

superviseFilter = () => { let company = this.props.cooperativeState.allCompany if(this.state.inspection.msName){ let list = null company.map(item => { if(item.comName == this.state.inspection.msName){ let a = item.comId if(this.state.inspection.superviseType == '137-01'){//港口 let wharfs = this.props.superviseState.allWharfs wharfs = wharfs.filter(wharf => wharf.comId == a) return wharfs.map(wharf => wharf.wharfName) }else if(this.state.inspection.superviseType == '137-02'){//航道 let waterways = this.props.superviseState.allWaterways waterways= waterways.filter(waterway => waterway.orgId.includes(a)) return waterways.map(waterway => waterway.waterwayName) } } }) alert('执行') }else{ } }

分析：在该函数的map循环遍历中进行返回，理应来说return之后他不会往下执行了，结果打印时你会发现，他继续执行了，所以说这样写是错误的
正确代码如下：

superviseFilter = () => { let company = this.props.cooperativeState.allCompany if(this.state.inspection.msName){ let list = null company.map(item => { if(item.comName == this.state.inspection.msName){ let a = item.comId if(this.state.inspection.superviseType == '137-01'){//港口 let wharfs = this.props.superviseState.allWharfs wharfs = wharfs.filter(wharf => wharf.comId == a) list = wharfs.map(wharf => wharf.wharfName) }else if(this.state.inspection.superviseType == '137-02'){//航道 let waterways = this.props.superviseState.allWaterways waterways= waterways.filter(waterway => waterway.orgId.includes(a)) list = waterways.map(waterway => waterway.waterwayName) } } }) return list }else{ } }

ok，我也是第一次遇到，纠结了好一会，终于解决了