\u5ba2\u6237\u7aef(\u6d4f\u89c8\u5668\u7aef)\u5b58\u50a8\u6570\u636e\u6709\u8bf8\u591a\u76ca\u5904\uff0c\u6700\u4e3b\u8981\u7684\u4e00\u70b9\u662f\u80fd\u5feb\u901f\u8bbf\u95ee(\u7f51\u9875)\u6570\u636e\u3002(\u4ee5\u5f80)\u5728\u5ba2\u6237\u7aef\u6709\u4e94\u79cd\u6570\u636e\u5b58\u50a8\u65b9\u6cd5\uff0c\u800c\u76ee\u524d\u5c31\u53ea\u6709\u56db\u79cd\u5e38\u7528\u65b9\u6cd5\u4e86(\u5176\u4e2d\u4e00\u79cd\u88ab\u5e9f\u5f03\u4e86)\uff1a
\nCookies<\/p>\n
Local Storage<\/p>\n
Session Storage<\/p>\n
IndexedDB<\/p>\n
WebSQL (\u88ab\u5e9f\u5f03)
\nCookies
\nCookies \u662f\u4e00\u79cd\u5728\u6587\u6863\u5185\u5b58\u50a8\u5b57\u7b26\u4e32\u6570\u636e\u6700\u5178\u578b\u7684\u65b9\u5f0f\u3002\u4e00\u822c\u800c\u8a00\uff0ccookies \u4f1a\u7531\u670d\u52a1\u7aef\u53d1\u9001\u7ed9\u5ba2\u6237\u7aef\uff0c\u5ba2\u6237\u7aef\u5b58\u50a8\u4e0b\u6765\uff0c\u7136\u540e\u5728\u968f\u540e\u8ba9\u8bf7\u6c42\u4e2d\u518d\u53d1\u56de\u7ed9\u670d\u52a1\u7aef\u3002\u8fd9\u53ef\u4ee5\u7528\u4e8e\u8bf8\u5982\u7ba1\u7406\u7528\u6237\u4f1a\u8bdd\uff0c\u8ffd\u8e2a\u7528\u6237\u4fe1\u606f\u7b49\u4e8b\u60c5\u3002
\n\u6b64\u5916\uff0c\u5ba2\u6237\u7aef\u4e5f\u7528\u4f7f\u7528 cookies \u5b58\u50a8\u6570\u636e\u3002\u56e0\u800c\uff0ccookies \u5e38\u88ab\u7528\u4e8e\u5b58\u50a8\u4e00\u4e9b\u901a\u7528\u7684\u6570\u636e\uff0c\u5982\u7528\u6237\u7684\u9996\u9009\u9879\u8bbe\u7f6e\u3002
\nCookies \u7684 \u57fa\u672cCRUD \u64cd\u4f5c
\n\u901a\u8fc7\u4e0b\u9762\u7684\u8bed\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\uff0c\u8bfb\u53d6\uff0c\u66f4\u65b0\u548c\u5220\u9664 cookies:
\n\/\/ Create<\/p>\n
document.cookie = “user_name=Ire Aderinokun”; <\/p>\n
document.cookie = “user_age=25;max-age=31536000;secure”;<\/p>\n
<\/p>\n
\/\/ Read (All)<\/p>\n
console.log( document.cookie );<\/p>\n
<\/p>\n
\/\/ Update<\/p>\n
document.cookie = “user_age=24;max-age=31536000;secure”;<\/p>\n
<\/p>\n
\/\/ Delete<\/p>\n
document.cookie = “user_name=Ire Aderinokun;expires=Thu, 01 Jan 1970 00:00:01 GMT”;
\nCookies \u7684\u4f18\u70b9
\n\u80fd\u7528\u4e8e\u548c\u670d\u52a1\u7aef\u901a\u4fe1<\/p>\n
\u5f53 cookie \u5feb\u8981\u81ea\u52a8\u8fc7\u671f\u65f6\uff0c\u6211\u4eec\u53ef\u4ee5\u91cd\u65b0\u8bbe\u7f6e\u800c\u4e0d\u662f\u5220\u9664
\nCookies \u7684\u7f3a\u70b9
\n\u589e\u52a0\u4e86\u6587\u6863\u4f20\u8f93\u7684\u8d1f\u8f7d<\/p>\n
\u53ea\u80fd\u5b58\u50a8\u5c11\u91cf\u7684\u6570\u636e<\/p>\n
\u53ea\u80fd\u5b58\u50a8\u5b57\u7b26\u4e32<\/p>\n
\u6f5c\u5728\u7684 \u5b89\u5168\u95ee\u9898<\/p>\n
\u81ea\u4ece\u6709 Web Storage API (Local and Session Storage)\uff0ccookies \u5c31\u4e0d\u518d\u88ab\u63a8\u8350\u7528\u4e8e\u5b58\u50a8\u6570\u636e\u4e86
\n\u6d4f\u89c8\u5668\u652f\u6301
\n\u6240\u6709\u4e3b\u6d41\u6d4f\u89c8\u5668\u5747\u652f\u6301 Cookies.
\nLocal Storage
\nLocal Storage \u662f Web Storage API \u7684\u4e00\u79cd\u7c7b\u578b\uff0c\u80fd\u5728\u6d4f\u89c8\u5668\u7aef\u5b58\u50a8\u952e\u503c\u5bf9\u6570\u636e\u3002Local Storage \u56e0\u63d0\u4f9b\u4e86\u66f4\u76f4\u89c2\u548c\u5b89\u5168\u7684API\u6765\u5b58\u50a8\u7b80\u5355\u7684\u6570\u636e\uff0c\u88ab\u89c6\u4e3a\u66ff\u4ee3 Cookies \u7684\u4e00\u79cd\u89e3\u51b3\u65b9\u6848\u3002
\n\u4ece\u6280\u672f\u4e0a\u8bf4\uff0c\u5c3d\u7ba1 Local Storage \u53ea\u80fd\u5b58\u50a8\u5b57\u7b26\u4e32\uff0c\u4f46\u662f\u5b83\u4e5f\u662f\u53ef\u4ee5\u5b58\u50a8\u5b57\u7b26\u4e32\u5316\u7684JSON\u6570\u636e\u3002\u8fd9\u5c31\u610f\u5473\u7740\uff0cLocal Storage \u80fd\u6bd4 Cookies \u5b58\u50a8\u66f4\u590d\u6742\u7684\u6570\u636e\u3002
\nLocal Storage \u7684 \u57fa\u672cCRUD \u64cd\u4f5c
\n\u901a\u8fc7\u4e0b\u9762\u7684\u8bed\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\uff0c\u8bfb\u53d6\uff0c\u66f4\u65b0\u548c\u5220\u9664 Local Storage:
\n\/\/ Create<\/p>\n
const user = { name: ‘Ire Aderinokun’, age: 25 } <\/p>\n
localStorage.setItem(‘user’, JSON.stringify(user));<\/p>\n
<\/p>\n
\/\/ Read (Single)<\/p>\n
console.log( JSON.parse(localStorage.getItem(‘user’)) )<\/p>\n
<\/p>\n
\/\/ Update<\/p>\n
const updatedUser = { name: ‘Ire Aderinokun’, age: 24 } <\/p>\n
localStorage.setItem(‘user’, JSON.stringify(updatedUser));<\/p>\n
<\/p>\n
\/\/ Delete<\/p>\n
localStorage.removeItem(‘user’);
\nLocal Storage \u7684\u4f18\u70b9
\n\u76f8\u6bd4\u4e8eCookies\uff1a
\n\u5176\u63d0\u4f9b\u4e86\u66f4\u76f4\u89c2\u5730\u63a5\u53e3\u6765\u5b58\u50a8\u6570\u636e<\/p>\n
\u66f4\u5b89\u5168<\/p>\n
\u80fd\u5b58\u50a8\u66f4\u591a\u6570\u636e
\nLocal Storage \u7684\u7f3a\u70b9
\n\u53ea\u80fd\u5b58\u50a8\u5b57\u7b26\u4e32\u6570\u636e(\u76f4\u63a5\u5b58\u50a8\u590d\u5408\u6570\u636e\u7c7b\u578b\u5982\u6570\u7ec4\/\u5bf9\u8c61\u7b49\uff0c\u90fd\u4f1a\u8f6c\u5316\u6210\u5b57\u7b26\u4e32\uff0c\u4f1a\u5b58\u5728\u5b58\u53d6\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5)\uff1a
\nlocalStorage.setItem(‘test’,1);<\/p>\n
console.log(typeof localStorage.getItem(‘test’)) \/\/”string”<\/p>\n
<\/p>\n
localStorage.setItem(‘test2’,[1,2,3]);<\/p>\n
console.log(typeof localStorage.getItem(‘test2’)) \/\/”string”<\/p>\n
console.log(localStorage.getItem(‘test2’)) \/\/”1,2,3″<\/p>\n
<\/p>\n
localStorage.setItem(‘test3’,{a:1,b:2});<\/p>\n
console.log(typeof localStorage.getItem(‘test3’)) \/\/”string”<\/p>\n
console.log(localStorage.getItem(‘test3’)) \/\/”[object object]”<\/p>\n
<\/p>\n
\/\/\u4e3a\u907f\u514d\u5b58\u53d6\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u60c5\u5f62\uff0c\u5b58\u50a8\u590d\u5408\u6570\u636e\u7c7b\u578b\u65f6\u8fdb\u884c\u5e8f\u5217\u5316\uff0c\u8bfb\u53d6\u65f6\u8fdb\u884c\u53cd\u5e8f\u5217\u5316<\/p>\n
localStorage.setItem(‘test4’, JSON.stringify({a:1,b:2}));<\/p>\n
console.log(typeof localStorage.getItem(‘test4’)) \/\/”string”<\/p>\n
console.log(JSON.parse(localStorage.getItem(‘test4’))) \/\/{a:1,b:2}
\n\u6d4f\u89c8\u5668\u652f\u6301
\nIE8+\/Edge\/Firefox 2+\/Chrome\/Safari 4+\/Opera 11.5+(caniuse)
\nSession Storage
\nSession Storage \u662f Web Storage API \u7684\u53e6\u4e00\u79cd\u7c7b\u578b\u3002\u548c Local Storage \u975e\u5e38\u7c7b\u4f3c\uff0c\u533a\u522b\u662f Session Storage \u53ea\u5b58\u50a8\u5f53\u524d\u4f1a\u8bdd\u9875(tab\u9875)\u7684\u6570\u636e\uff0c\u4e00\u65e6\u7528\u6237\u5173\u95ed\u5f53\u524d\u9875\u6216\u8005\u6d4f\u89c8\u5668\uff0c\u6570\u636e\u5c31\u81ea\u52a8\u88ab\u6e05\u9664\u6389\u4e86\u3002
\nSession Storage \u7684 \u57fa\u672cCRUD \u64cd\u4f5c
\n\u901a\u8fc7\u4e0b\u9762\u7684\u8bed\u6cd5\uff0c\u6211\u4eec\u53ef\u4ee5\u521b\u5efa\uff0c\u8bfb\u53d6\uff0c\u66f4\u65b0\u548c\u5220\u9664 Session Storage:
\n\/\/ Create<\/p>\n
const user = { name: ‘Ire Aderinokun’, age: 25 } <\/p>\n
sessionStorage.setItem(‘user’, JSON.stringify(user));<\/p>\n
<\/p>\n
\/\/ Read (Single)<\/p>\n
console.log( JSON.parse(sessionStorage.getItem(‘user’)) )<\/p>\n
<\/p>\n
\/\/ Update<\/p>\n
const updatedUser = { name: ‘Ire Aderinokun’, age: 24 } <\/p>\n
sessionStorage.setItem(‘user’, JSON.stringify(updatedUser));<\/p>\n
<\/p>\n
\/\/ Delete<\/p>\n
sessionStorage.removeItem(‘user’);
\n\u4f18\u70b9\uff0c\u7f3a\u70b9\u548c\u6d4f\u89c8\u5668\u652f\u6301
\n\u548c Local Storage \u4e00\u6837
\nIndexedDB
\nIndexedDB \u662f\u4e00\u79cd\u66f4\u590d\u6742\u548c\u5168\u9762\u5730\u5ba2\u6237\u7aef\u6570\u636e\u5b58\u50a8\u65b9\u6848\uff0c\u5b83\u662f\u57fa\u4e8e JavaScript\u3001\u9762\u5411\u5bf9\u8c61\u7684\u548c\u6570\u636e\u5e93\u7684\uff0c\u80fd\u975e\u5e38\u5bb9\u6613\u5730\u5b58\u50a8\u6570\u636e\u548c\u68c0\u7d22\u5df2\u7ecf\u5efa\u7acb\u5173\u952e\u5b57\u7d22\u5f15\u7684\u6570\u636e\u3002
\n\u5728\u6784\u5efa\u6e10\u8fdb\u5f0fWeb\u5e94\u7528\u4e00\u6587\u4e2d\uff0c\u6211\u5df2\u7ecf\u4ecb\u7ecd\u4e86\u600e\u4e48\u4f7f\u7528 IndexedDB \u6765\u521b\u5efa\u4e00\u4e2a\u79bb\u7ebf\u4f18\u5148\u7684\u5e94\u7528\u3002
\nIndexedDB \u7684\u57fa\u672c CRUD \u64cd\u4f5c
\n\u6ce8\uff1a\u5728\u793a\u4f8b\u4e2d\uff0c\u6211\u4f7f\u7528\u4e86 Jake\u2019s Archibald \u7684 IndexedDB Promised library, \u5b83\u63d0\u4f9b\u4e86 Promise \u98ce\u683c\u7684IndexedDB\u65b9\u6cd5
\n\u4f7f\u7528 IndexedDB \u5728\u6d4f\u89c8\u5668\u7aef\u5b58\u50a8\u6570\u636e\u6bd4\u4e0a\u8ff0\u5176\u5b83\u65b9\u6cd5\u66f4\u590d\u6742\u3002\u5728\u6211\u4eec\u80fd\u521b\u5efa\/\u8bfb\u53d6\/\u66f4\u65b0\/\u5220\u9664\u4efb\u4f55\u6570\u636e\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u5148\u6253\u5f00\u6570\u636e\u5e93\uff0c\u521b\u5efa\u6211\u4eec\u9700\u8981\u7684stores(\u7c7b\u4f3c\u4e8e\u5728\u6570\u636e\u5e93\u4e2d\u521b\u5efa\u4e00\u4e2a\u8868)\u3002
\nfunction OpenIDB() { <\/p>\n
return idb.open(‘SampleDB’, 1, function(upgradeDb) {<\/p>\n
const users = upgradeDb.createObjectStore(‘users’, {<\/p>\n
keyPath: ‘name’<\/p>\n
});<\/p>\n
});<\/p>\n
}
\n\u521b\u5efa\u6216\u8005\u66f4\u65b0store\u4e2d\u7684\u6570\u636e\uff1a
\n\/\/ 1. Open up the database<\/p>\n
OpenIDB().then((db) => { <\/p>\n
const dbStore = ‘users’;<\/p>\n
<\/p>\n
\/\/ 2. Open a new read\/write transaction with the store within the database<\/p>\n
const transaction = db.transaction(dbStore, ‘readwrite’);<\/p>\n
const store = transaction.objectStore(dbStore);<\/p>\n
<\/p>\n
\/\/ 3. Add the data to the store<\/p>\n
store.put({<\/p>\n
name: ‘Ire Aderinokun’,<\/p>\n
age: 25<\/p>\n
});<\/p>\n
<\/p>\n
\/\/ 4. Complete the transaction<\/p>\n
return transaction.complete;<\/p>\n
});
\n\u68c0\u7d22\u6570\u636e\uff1a
\n\/\/ 1. Open up the database<\/p>\n
OpenIDB().then((db) => { <\/p>\n
const dbStore = ‘users’;<\/p>\n
<\/p>\n
\/\/ 2. Open a new read-only transaction with the store within the database<\/p>\n
const transaction = db.transaction(dbStore);<\/p>\n
const store = transaction.objectStore(dbStore);<\/p>\n
<\/p>\n
\/\/ 3. Return the data<\/p>\n
return store.get(‘Ire Aderinokun’);<\/p>\n
}).then((item) => {<\/p>\n
console.log(item);<\/p>\n
})
\n\u5220\u9664\u6570\u636e\uff1a
\n\/\/ 1. Open up the database<\/p>\n
OpenIDB().then((db) => { <\/p>\n
const dbStore = ‘users’;<\/p>\n
<\/p>\n
\/\/ 2. Open a new read\/write transaction with the store within the database<\/p>\n
const transaction = db.transaction(dbStore, ‘readwrite’);<\/p>\n
const store = transaction.objectStore(dbStore);<\/p>\n
<\/p>\n
\/\/ 3. Delete the data corresponding to the passed key<\/p>\n
store.delete(‘Ire Aderinokun’);<\/p>\n
<\/p>\n
\/\/ 4. Complete the transaction<\/p>\n
return transaction.complete;<\/p>\n
})
\n\u5982\u679c\u4f60\u6709\u5174\u8da3\u4e86\u89e3\u66f4\u591a\u5173\u4e8eIndexedDB\u7684\u4f7f\u7528\uff0c\u53ef\u4ee5\u9605\u8bfb\u6211\u7684\u8fd9\u7bc7\u5173\u4e8e\u600e\u4e48\u5728\u6e10\u8fdb\u5f0fWeb\u5e94\u7528(PWA)\u4f7f\u7528IndexedD\u3002
\nIndexedDB \u7684\u4f18\u70b9
\n\u80fd\u591f\u5904\u7406\u66f4\u590d\u6742\u548c\u7ed3\u6784\u5316\u7684\u6570\u636e<\/p>\n
\u6bcf\u4e2a\u2019database\u2019\u4e2d\u53ef\u4ee5\u6709\u591a\u4e2a\u2019databases\u2019\u548c\u2019tables\u2019<\/p>\n
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\nIndexedDB \u7684\u7f3a\u70b9
\n\u6bd4 Web Storage API \u66f4\u96be\u4e8e\u5e94\u7528
\n\u6d4f\u89c8\u5668\u652f\u6301
\nIE10+\/Edge12+\/Firefox 4+\/Chrome 11+\/Safari 7.1+\/Opera 15+(caniuse)<\/p>\n
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