function getNode(subjectId, nodeId){
request(`http://hr.amiaodaifu.com:50000/1610/questions/${subjectId}/get-children/${nodeId}`, (err, res, body) => {
console.log(body)
if(err){
return console.log("err: ",err)
} else {
const content = JSON.parse(body);
console.log(content)
return content.length == 0 ? Promise.resolve(content) : Promise.resolve({
id: nodeId,
children: JSON.parse(body)
})
}
})
}
function getTree(subjectId, nodeId){
getNode(subjectId, nodeId)
.then(items => {
return Promise.map(items.children, item => (getTree(item)))
})
// .then((children) => ({
// id: nodeId,
// children
// }))
}
调用getTree的时候,提示的错误是:
Cannot read property 'then' of undefined
是我的思路有问题吗?
首先,
request
返回值不是Promise
。其次,你的
getNode
方法里也没有返回request
的结果。可以这么改下:
楼上正解, promise用错地方了
return Promise.map(items.children, item => (getTree(item)))
有 Promise.map这个函数吗?怎么用?