* feat(tools): add seed/solution restore script * chore(curriculum): remove empty sections' markers * chore(curriculum): add seed + solution to Chinese * chore: remove old formatter * fix: update getChallenges parse translated challenges separately, without reference to the source * chore(curriculum): add dashedName to English * chore(curriculum): add dashedName to Chinese * refactor: remove unused challenge property 'name' * fix: relax dashedName requirement * fix: stray tag Remove stray `pre` tag from challenge file. Signed-off-by: nhcarrigan <nhcarrigan@gmail.com> Co-authored-by: nhcarrigan <nhcarrigan@gmail.com>
2.1 KiB
2.1 KiB
id, title, challengeType, forumTopicId, dashedName
id | title | challengeType | forumTopicId | dashedName |
---|---|---|---|---|
5cdafbd72913098997531681 | 在 then 中处理 Promise 完成的情况 | 1 | 301203 | handle-a-fulfilled-promise-with-then |
--description--
当程序需要花费未知的时间才能完成时 Promise 很有用(比如,一些异步操作),一般是网络请求。网络请求会花费一些时间,当结束时需要根据服务器的响应执行一些操作。这可以用 then
方法来实现,当 promise 完成 resolve
时会触发 then
方法。例子如下:
myPromise.then(result => {
// do something with the result.
});
result
即传入 resolve
方法的参数。
--instructions--
给 promise 添加 then
方法。用 result
做为回调函数的参数并将 result
打印在控制台。
--hints--
应该给 promise 方法调用 then
方法。
assert(codeWithoutSpaces.match(/(makeServerRequest|\))\.then\(/g));
then
方法应该有一个回调函数,回调函数参数为 result
。
assert(resultIsParameter);
应该打印 result
到控制台。
assert(
resultIsParameter &&
codeWithoutSpaces.match(/\.then\(.*?result.*?console.log\(result\).*?\)/)
);
--seed--
--after-user-code--
const resultIsParameter = /\.then\((function\(result\){|result|\(result\)=>)/.test(__helpers.removeWhiteSpace(code));
--seed-contents--
const makeServerRequest = new Promise((resolve, reject) => {
// responseFromServer is set to true to represent a successful response from a server
let responseFromServer = true;
if(responseFromServer) {
resolve("We got the data");
} else {
reject("Data not received");
}
});
--solutions--
const makeServerRequest = new Promise((resolve, reject) => {
// responseFromServer is set to true to represent a successful response from a server
let responseFromServer = true;
if(responseFromServer) {
resolve("We got the data");
} else {
reject("Data not received");
}
});
makeServerRequest.then(result => {
console.log(result);
});