new Promise(resolve=> { let request=indexedDB.open("vector",1); let db; request.addEventListener("success",event=> { db=event.target.result; resolve(db); }); request.addEventListener("upgradeneeded",event=> { const db=event.target.result; if(db.objectStoreNames.contains("xy")) db.deleteObjectStore("xy"); db.createObjectStore("xy",{keyPath:"x"}); }); }).then(db=> { let transaction=db.transaction("xy","readwrite"); transaction.addEventListener("error",()=>console.log("事务失败")); transaction.addEventListener("complete",()=>console.log("事务成功")); let store=transaction.objectStore("xy"); // const request2=store.add({ // x:"999", // y:"111" // }); // request2.addEventListener("error",()=>console.log("存储失败")); // request2.addEventListener("success",()=>console.log("存储成功")); const request3=store.get("22222"); request3.addEventListener("error",()=>console.log("get请求失败")); request3.addEventListener("success",event=> { console.log(event.target.result); console.log("get请求成功"); }); });在我第一次存储的时候，都是成功的，这没问题。但是在我第二次运行的时候，// const request2=store.add({ // x:"999", // y:"111" // }); // request2.addEventListener("error",()=>console.log("存储失败")); // request2.addEventListener("success",()=>console.log("存储成功"));我把这段代码注释了，此时本地存储应该只有X 999 Y 111可是get返回了请求成功为什么？