我正在循环一个对象以返回值。当我 console.log 结果时,代码工作正常,但当我尝试将其呈现为文本时,代码不起作用。由于某种原因它只返回第一个值。我做错了什么?
代码如下:
testFunc = () => {
let spaceship = {
crew: {
captain: {
name: 'Lily',
degree: 'Computer Engineering',
cheerTeam() { console.log('You got this!') }
},
'chief officer': {
name: 'Dan',
degree: 'Aerospace Engineering',
agree() { console.log('I agree, captain!') }
},
medic: {
name: 'Clementine',
degree: 'Physics',
announce() { console.log(`Jets on!`) } },
translator: {
name: 'Shauna',
degree: 'Conservation Science',
powerFuel() { console.log('The tank is full!') }
}
}
};
for(let crewMember in spaceship.crew){
return spaceship.crew[crewMember].name
}
}
render(){
return(
<div>
{this.testFunc()}
</div>
)
}
新代码,不渲染
testFunc = () => {
let spaceship = {
crew: {
captain: {
name: 'Lily',
degree: 'Computer Engineering',
cheerTeam() { console.log('You got this!') }
},
'chief officer': {
name: 'Dan',
degree: 'Aerospace Engineering',
agree() { console.log('I agree, captain!') }
},
medic: {
name: 'Clementine',
degree: 'Physics',
announce() { console.log(`Jets on!`) } },
translator: {
name: 'Shauna',
degree: 'Conservation Science',
powerFuel() { console.log('The tank is full!') }
}
}
};
return Object.entries(spaceship.crew).map(member => member.name)
}
渲染(){ 返回( {this.testFunc()} ) }
最佳答案
问题是,在 for
循环的第一次迭代中,函数返回并结束。可能的解决方案是:
testFunc = () => {
let spaceship = {
crew: {
captain: {
name: 'Lily',
degree: 'Computer Engineering',
cheerTeam() { console.log('You got this!') }
},
'chief officer': {
name: 'Dan',
degree: 'Aerospace Engineering',
agree() { console.log('I agree, captain!') }
},
medic: {
name: 'Clementine',
degree: 'Physics',
announce() { console.log(`Jets on!`) } },
translator: {
name: 'Shauna',
degree: 'Conservation Science',
powerFuel() { console.log('The tank is full!') }
}
}
};
var names = []
for(var key in spaceship.crew){
names.push(spaceship.crew[key].name)
}
return names // Return an array with the names
}
然后,在渲染中,您应该执行以下操作:
render(){
return(
<div>
{this.testFunc().map(name => <p> name </p>)}
</div>
)
}
关于javascript - For..in 只返回第一项 - React js,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/53510153/