IDBObjectStore.keyPath
此屬性可以返回物件倉庫中規定記錄的主鍵路徑。
keyPath屬性可以通過createObjectStore()方法的第二個引數規定。
關於createObjectStore()具體用參閱createObjectStore() 建立物件倉庫一章節。
語法結構:
[JavaScript] 純文字檢視 複製程式碼let keyPath = objectStore.keyPath;
非常簡單的一個屬性,看如下程式碼例項:
[HTML] 純文字檢視 複製程式碼執行程式碼<!doctype html> <html> <head> <meta charset="utf-8"> <meta name="author" content="http://www.softwhy.com/" /> <title>螞蟻部落</title> <script> let request = window.indexedDB.open("antzone", 1); request.onupgradeneeded = (ev) => { let db = ev.target.result; if (!db.objectStoreNames.contains('students')) { let objectStore = db.createObjectStore('students',{keyPath:"id"}); objectStore.createIndex("xingbie","sex",{ unique: false }); } } request.onsuccess = (ev) => { let db = ev.target.result; let transaction = db.transaction(['students'], 'readonly'); let objectStore = transaction.objectStore('students'); console.log(objectStore.keyPath); } </script> </head> <body> <p>列印物件倉庫的主鍵</p> </body> </html>
程式碼執行效果截圖如下:
可以看到物件倉庫的主鍵是id,通過createObjectStore()方法第二個引數設定。