Re: [問題] 如何撰寫操作 IndexedDB 的測試程式碼

[zeSil (Ryhpezlis)]

※ 引述《art1 (人，原來不是人)》之銘言：
43
:   function openDB (name, version) {
:     let request = indexedDB.open(name, version);
:     request.onerror = (event) => {
:       console.log('error');
:     };
:     request.onsuccess = (event) => {
:       console.log('success');
:     };
:     request.onupgradeneeded = (event) => {
:       console.log('upgrade');
:     };
:   }

通常遇到這種 evet driven 以及非同步的，
我會把它全部包成 promise 處理，避免遇到你說的 callback 問題

function openDB(name, version) {
  return new Promise((resolve, reject) => {
    let request = indexedDB.open(name, version);
    request.onerror = event => {
      reject(do_something_stuff);
    };
    request.onsuccess = event => {
      resolve(do_something_stuff);
    };
    request.onupgradeneeded = event => {
      // do_something_stuff
    };
  });
}

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