//当前的jsfiddle http://jsfiddle.net/0ht35rpb/45/
我正在尝试循环浏览一个json导航树 - 这样当一个人去某个特定页面时，它会发现它的替代语言对应部分。
// JSON
{
"langs" : [
{
"lang" : "de",
"lines" : {
"menu" : [
{
"title" : "Anleitung",
"link" : "/de/anleitung"
},
{
"title" : "Funktionen",
"link" : "/de/funktionen"
},
{
"title" : "Dienstleistungen",
"link" : "/de/dienstleistungen",
"children" : [
{
"title" : "Geistiges Eigentum",
"link" : "/de/dienstleistungen/geistiges-eigentum"
},
{
"title" : "Compliance",
"link" : "/de/dienstleistungen/compliance"
},
{
"title" : "Investment- und Beteiligungsrecht",
"link" : "/de/dienstleistungen/beteiligungsrecht"
},
{
"title" : "Mergers & Acquisitions",
"link" : "/de/dienstleistungen/mergers-and-acquisitions"
},
{
"title" : "Immobilienrecht",
"link" : "/de/dienstleistungen/immobilienrecht"
},
{
"title" : "Internet- und Datenschutzrecht",
"link" : "/de/dienstleistungen/internetrecht"
},
{
"title" : "Gesellschaftsrecht",
"link" : "/de/dienstleistungen/gesellschaftsrecht"
},
{
"title" : "Handelsrecht",
"link" : "/de/dienstleistungen/handelsrecht"
},
{
"title" : "Arbeitsrecht",
"link" : "/de/dienstleistungen/arbeitsrecht"
},
{
"title" : "Bankrecht",
"link" : "/de/dienstleistungen/bankrecht"
},
{
"title" : "Vertragsrecht",
"link" : "/de/dienstleistungen/vertragsrecht"
},
{
"title" : "Wettbewerbsrecht",
"link" : "/de/dienstleistungen/wettbewerbsrecht"
}
]
},
{
"title" : "Beliebte Projekte",
"link" : "/de/beliebte-projekte",
"children" : [
{
"title" : "Compliance",
"link" : "/de/beliebte-projekte/compliance",
"children" : [
{
"title" : "Haftungsrisiken für Geschäftsführern",
"link" : "/de/beliebte-projekte/compliance/haftungsrisken-geschaeftsfuehrern"
},
{
"title" : "Compliance-Prüfung KMU",
"link" : "/de/beliebte-projekte/compliance/compliance-pruefung-kmu"
}
]
}
]
}
],
"sign_in" : "Login"
}
},
{
"lang" : "en",
"lines" : {
"menu" : [
{
"title" : "How it works",
"link" : "/en/how-it-works"
},
{
"title" : "Features",
"link" : "/en/features"
},
{
"title" : "Services",
"link" : "/en/services",
"children" : [
{
"title" : "Intellectual property",
"link" : "/en/services/intellectual-property"
},
{
"title" : "Compliance",
"link" : "/en/services/compliance"
},
{
"title" : "Investment law",
"link" : "/en/services/investment-law"
},
{
"title" : "Mergers & Acquisitions",
"link" : "/en/services/mergers-and-acquisitions"
},
{
"title" : "Real estate law",
"link" : "/en/services/real-estate-law"
},
{
"title" : "Internet law and data privacy",
"link" : "/en/services/internet-law"
},
{
"title" : "Company law",
"link" : "/en/services/company-law"
},
{
"title" : "Trade law",
"link" : "/en/services/trade-law"
},
{
"title" : "Labour law",
"link" : "/en/services/labour-law"
},
{
"title" : "Bank law",
"link" : "/en/services/bank-law"
},
{
"title" : "Contract law",
"link" : "/en/services/contract-law"
},
{
"title" : "Competition law",
"link" : "/en/services/competition-law"
}
]
},
{
"title" : "Popular Projects",
"link" : "/en/popular-projects",
"children" : [
{
"title" : "Compliance",
"link" : "/en/popular-projects/compliance",
"children" : [
{
"title" : "Haf eng",
"link" : "/en/popular-projects/compliance/haf-eng"
},
{
"title" : "Compliance eng",
"link" : "/en/popular-projects/compliance/compliance-eng"
}
]
}
]
}
],
"sign_in" : "Sign in"
}
}
]
}
我的js函数
所以在这种情况下
想象 CURRENTLNG as en CURRENTURL as / en / services
fetchFooterUrls（）中的- 我想用[“/ en / services”，“/ de / dienstleistungen”]返回一个数组 这个代码在试图获得第3级导航计数器部件时失败了 [“/ en / popular-projects / compliance / compliance-eng”，“/ de / beliebte-projekte / compliance / compliance-pruefung-kmu”]
getUrl (pairUrl, currentLng, enMenu, deMenu, obj) {
for (let k in obj) {
if (!obj.hasOwnProperty(k)) continue
if (obj[k].link === pairUrl) {
if (currentLng === 'de') {
return enMenu[k].link // get en link equivlant
} else {
return deMenu[k].link // get de link equivlant
}
} else {
if (obj[k].hasOwnProperty('children') && obj[k].children.length > 0) continue
this.getUrl(pairUrl, currentLng, enMenu[k].children, deMenu[k].children, obj[k].children)
}
}
}
//
getLanguagePair (currentLng, pairUrl) {
// 'find url in json tree'
var enMenu = linkTreeObject.langs[1].lines.menu
var deMenu = linkTreeObject.langs[0].lines.menu
let obj = {}
// find position in tree
if (currentLng === 'de') {
obj = deMenu
} else {
obj = enMenu
}
return this.getUrl(pairUrl, currentLng, enMenu, deMenu, obj)
}
fetchFooterUrls () {
let deUrl = ''
let enUrl = ''
if (CURRENTLNG === 'de') {
deUrl = CURRENTURL
enUrl = this.getLanguagePair(CURRENTLNG, this.props.location.pathname)
} else {
enUrl = CURRENTURL
deUrl = this.getLanguagePair(CURRENTLNG, this.props.location.pathname)
}
return [enUrl, deUrl]
}
//尝试制作此片段 - 此处的任何版主都要解决？
var linkTreeObject ={
"langs" : [
{
"lang" : "de",
"lines" : {
"menu" : [
{
"title" : "Anleitung",
"link" : "/de/anleitung"
},
{
"title" : "Funktionen",
"link" : "/de/funktionen"
},
{
"title" : "Dienstleistungen",
"link" : "/de/dienstleistungen",
"children" : [
{
"title" : "Geistiges Eigentum",
"link" : "/de/dienstleistungen/geistiges-eigentum"
},
{
"title" : "Compliance",
"link" : "/de/dienstleistungen/compliance"
},
{
"title" : "Investment- und Beteiligungsrecht",
"link" : "/de/dienstleistungen/beteiligungsrecht"
},
{
"title" : "Mergers & Acquisitions",
"link" : "/de/dienstleistungen/mergers-and-acquisitions"
},
{
"title" : "Immobilienrecht",
"link" : "/de/dienstleistungen/immobilienrecht"
},
{
"title" : "Internet- und Datenschutzrecht",
"link" : "/de/dienstleistungen/internetrecht"
},
{
"title" : "Gesellschaftsrecht",
"link" : "/de/dienstleistungen/gesellschaftsrecht"
},
{
"title" : "Handelsrecht",
"link" : "/de/dienstleistungen/handelsrecht"
},
{
"title" : "Arbeitsrecht",
"link" : "/de/dienstleistungen/arbeitsrecht"
},
{
"title" : "Bankrecht",
"link" : "/de/dienstleistungen/bankrecht"
},
{
"title" : "Vertragsrecht",
"link" : "/de/dienstleistungen/vertragsrecht"
},
{
"title" : "Wettbewerbsrecht",
"link" : "/de/dienstleistungen/wettbewerbsrecht"
}
]
},
{
"title" : "Beliebte Projekte",
"link" : "/de/beliebte-projekte",
"children" : [
{
"title" : "Compliance",
"link" : "/de/beliebte-projekte/compliance",
"children" : [
{
"title" : "Haftungsrisiken für Geschäftsführern",
"link" : "/de/beliebte-projekte/compliance/haftungsrisken-geschaeftsfuehrern"
},
{
"title" : "Compliance-Prüfung KMU",
"link" : "/de/beliebte-projekte/compliance/compliance-pruefung-kmu"
}
]
}
]
}
],
"sign_in" : "Login"
}
},
{
"lang" : "en",
"lines" : {
"menu" : [
{
"title" : "How it works",
"link" : "/en/how-it-works"
},
{
"title" : "Features",
"link" : "/en/features"
},
{
"title" : "Services",
"link" : "/en/services",
"children" : [
{
"title" : "Intellectual property",
"link" : "/en/services/intellectual-property"
},
{
"title" : "Compliance",
"link" : "/en/services/compliance"
},
{
"title" : "Investment law",
"link" : "/en/services/investment-law"
},
{
"title" : "Mergers & Acquisitions",
"link" : "/en/services/mergers-and-acquisitions"
},
{
"title" : "Real estate law",
"link" : "/en/services/real-estate-law"
},
{
"title" : "Internet law and data privacy",
"link" : "/en/services/internet-law"
},
{
"title" : "Company law",
"link" : "/en/services/company-law"
},
{
"title" : "Trade law",
"link" : "/en/services/trade-law"
},
{
"title" : "Labour law",
"link" : "/en/services/labour-law"
},
{
"title" : "Bank law",
"link" : "/en/services/bank-law"
},
{
"title" : "Contract law",
"link" : "/en/services/contract-law"
},
{
"title" : "Competition law",
"link" : "/en/services/competition-law"
}
]
},
{
"title" : "Popular Projects",
"link" : "/en/popular-projects",
"children" : [
{
"title" : "Compliance",
"link" : "/en/popular-projects/compliance",
"children" : [
{
"title" : "Haf eng",
"link" : "/en/popular-projects/compliance/haf-eng"
},
{
"title" : "Compliance eng",
"link" : "/en/popular-projects/compliance/compliance-eng"
}
]
}
]
}
],
"sign_in" : "Sign in"
}
}
]
};
getUrl (pairUrl, currentLng, enMenu, deMenu, obj) {
for (let k in obj) {
if (!obj.hasOwnProperty(k)) continue
if (obj[k].link === pairUrl) {
if (currentLng === 'de') {
return enMenu[k].link // get en link equivlant
} else {
return deMenu[k].link // get de link equivlant
}
} else {
if (obj[k].hasOwnProperty('children') && obj[k].children.length > 0) continue
this.getUrl(pairUrl, currentLng, enMenu[k].children, deMenu[k].children, obj[k].children)
}
}
}
//
getLanguagePair (currentLng, pairUrl) {
// 'find url in json tree'
var enMenu = linkTreeObject.langs[1].lines.menu
var deMenu = linkTreeObject.langs[0].lines.menu
let obj = {}
// find position in tree
if (currentLng === 'de') {
obj = deMenu
} else {
obj = enMenu
}
return this.getUrl(pairUrl, currentLng, enMenu, deMenu, obj)
}
console.log(getLanguagePair("en", "/en/how-it-works"))
答案 0 :(得分：1)
更新了jsfiddle。您在else部分中遇到与递归函数调用相关的错误。 http://jsfiddle.net/gaganshera/0ht35rpb/51/
将其更改为
from plyer import notification
ImportError: cannot import name 'notification'
答案 1 :(得分：1)
您的递归函数存在问题。如果您在第一个函数调用处不匹配该网址，则会再次递归调用该函数，但您不会将其返回。
function get_10_recursive(number){
if(number>=10) return 10;
else return get_10_recursive(number++);
}
在这个例子中，如果数字小于10，则递归调用该函数，直到遇到 return 语句，此后，它会回溯堆栈并返回正确的结果。如果删除第三行中的return语句，代码也会被执行，但它只返回第一次调用的结果，这是未定义的。
你的代码中的问题是，如果你在for循环中放置 return ，循环会被中断，你不会检查下一个字符串，所以你必须存储结果函数调用一个临时变量，只有当它真实时才返回它（也就是说它没有未定义）。
你的getUrl函数变成这样：
function getUrl(pairUrl, currentLng, enMenu, deMenu, obj) {
for (var k in obj) {
if (obj[k].link === pairUrl) {
if (currentLng === 'de') {
return enMenu[k].link; // get en link equivlant
} else {
return deMenu[k].link; // get de link equivlant
}
} else {
if (obj[k].hasOwnProperty('children')){
var tmp = getUrl(pairUrl, currentLng, enMenu[k].children, deMenu[k].children, obj[k].children);
if(tmp) return tmp; // check if it found the match successfully
}
}
}
}
PS：我重新调整了if (!obj.hasOwnProperty(k)) continue，因为它没用了