本文主要是介绍简单实用浏览器indexDB，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
之前在做项目的过程中，偶有用到indexDB来做缓存，后面就基本上使用的localstrage，恩，其实indexDB也是挺好使用的，可以去看看张鑫旭的这几篇文章
https://www.zhangxinxu.com/wordpress/2018/06/js-localforage-localstorage-indexdb/
https://www.zhangxinxu.com/wordpress/2017/07/html5-indexeddb-js-example/
写得也都很全面，下面附上自写的部分代码
class UtilDB {constructor(store, ...options) {this.store = store;this.options = options;}/*** 打开创建数据库 返回promise* @param {DB名字} name* @param {版本号} version*/openDB(name, version = 1, keypath) {let indexDB =window.indexedDB ||window.mozIndexedDB ||window.webkitIndexedDB ||window.msIndexedDB;let request = indexDB.open(name, version);const pormise = new Promise((resolve, reject) => {request.onerror = e => {console.log("连接indexDB数据库失败");console.error(e.currentTarget.error.message);reject(e.currentTarget.error.message);};request.onsuccess = e => {console.log("连接indexDB数据库成功");this.db = e.target.result;resolve(this.db);};request.onupgradeneeded = e => {let db = e.target.result;if (!db.objectStoreNames.contains(this.store)) {let store = db.createObjectStore(this.store, {keypath: keypath,autoIncrement: true});this.options.forEach(item => {if (Object.prototype.toString.call({}) == "[object Object]") {store.createIndex(item.name + "", item.name + "", item.options);} else {store.createIndex(item + "", item + "", {unique: false});}});}};});return pormise;}/*** 创建事务* @param {事务} way*/__commonCrud(way) {let normal = this.store + "";let tx = this.db.transaction(normal, way);let store = tx.objectStore(normal);return store;}/*** 添加数据* @param {一般为string类型} val 要添加的值* @param {Function} callback 回调函数*/addData(val, callback = () => {}) {let req = this.__commonCrud("readwrite");req = req.add(val);req.onsuccess = e => {console.info("addData", "添加数据成功");return callback(e.target);};req.onerror = e => {console.error("add Error", "添加数据失败");return callback(e.target);};}/*** 修改操作* @param {*} val 要修改的值* @param {*} callback 修改的回调*/putData(val, callback = () => {}) {let req = this.__commonCrud("readwrite");req = req.put(val, val[Object.keys(val)[0]]);req.onsuccess = e => {console.log("修改数据成功");return callback(e.target);};req.onerror = e => {console.log("修改数据失败");return callback(e.target);};}/*** 获取数据* @param {key} val key值，一般为string* @param {*} callback 获取数据的回调函数*/getData(val, callback = () => {}) {let req = this.__commonCrud("readonly");req = req.get(val);req.onsuccess = e => {if ("success" === e.type) {console.log("获取数据成功");return callback(e.target.result);}};req.onerror = e => {console.log("获取数据失败");return callback(e);};}/*** 获取所有数据* @param {*} callback*/getAllData(callback = () => {}) {let req = this.__commonCrud("readwrite");let result = [];req = req.openCursor();req.onerror = e => {console.error("query error", e.error);return callback(e.target);};req.onsuccess = e => {let cursor = e.target.result;if (cursor) {result.push(cursor.value);cursor.continue();} else {return callback(result);}};}/*** 获取单条数据* @param {*} name* @param {*} callback*/getSignleData(name, callback = () => {}) {console.log("获取单条信息");let req = this.__commonCrud("readonly");let index = req.index(this.options[0].name);req = index.get(name);req.onsuccess = e => {console.log("获取单条数据成功");return callback(e.target.result);};req.onerror = e => {console.log("获取单条数据成功");return callback(e.target.result);};}/*** 删除数据* @param {*} val* @param {*} callback*/deleteData(val, callback = () => {}) {let req = this.__commonCrud("readwrite");req = req.delete(val);req.onerror = e => {console.log("系统错误");return callback(e.target);};req.onsuccess = e => {console.log("执行成功");return callback(e.target);};}/*** 删除单条数据* @param {*} userName* @param {*} callback*/deleteSignleData(userName, callback = () => {}) {let req = this.__commonCrud("readwrite");req = req.openCursor();req.onerror = e => {console.error("query:error", "查询使用游标时出错");return callback(e.error.name);};req.onsuccess = e => {let cursor = e.target.result;if (cursor) {if (cursor.userName == userName) {cursor.delete();}cursor.continue();} else {return callback(cursor);}};}onError(callback) {return callback(event);}onSuccess(callback) {return callback(event);}onComplete(callback) {return callback(event);}/*** 关闭数据库* @param {数据库} db*/closeDB(db) {db.close();}/*** 删除数据库* @param {数据库名称} name*/deleteDB(name) {indexedDB.deleteDatabase(name);}
}
export default UtilDB;
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