<script type="module"> import factory from './factory.js'; let objects=factory(15); new Promise(resolve=> { const request=indexedDB.open("vector",4); request.addEventListener("error",()=>console.log("打开失败")); request.addEventListener("success",event=>resolve(event.target.result)); request.addEventListener("upgradeneeded",event=> { const db=event.target.result; db.createObjectStore("factory",{keyPath:"index"}); }); }).then(db=> { const transaction=db.transaction("factory","readwrite"); const store=transaction.objectStore("factory"); let request,requests=[]; for (const obj of objects) { let p=new Promise(resolve=> { request=store.add(obj); request.addEventListener("error",()=>console.log("存储失败")); request.addEventListener("success",()=> { console.log("存储成功"); resolve(); }); }); requests.push(p); } return Promise.all([requests]).then(()=>store); }).then((store)=> { const rangeKey=IDBKeyRange.bound(1,5); const requestCursor=store.openCursor(rangeKey); requestCursor.addEventListener("error",()=>console.log("cursor失败")); requestCursor.addEventListener("success",event=> { const cursor=event.target.result; if(cursor) { console.log(`key:${cursor.key}---object:${JSON.stringify(cursor.value)}`); cursor.continue(); } else console.log("结束"); }); }) </script>