{"id":168820,"date":"2024-05-08T16:32:27","date_gmt":"2024-05-08T08:32:27","guid":{"rendered":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168820.html"},"modified":"2024-05-08T16:32:33","modified_gmt":"2024-05-08T08:32:33","slug":"javascript-%e9%a1%b9%e7%9b%ae%e6%80%8e%e4%b9%88%e5%ae%9e%e7%8e%b0%e6%b5%8f%e8%a7%88%e5%99%a8%e6%9c%ac%e5%9c%b0%e5%ad%98%e5%82%a8","status":"publish","type":"post","link":"https:\/\/docs.pingcode.com\/ask\/ask-ask\/168820.html","title":{"rendered":"Javascript \u9879\u76ee\u600e\u4e48\u5b9e\u73b0\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8"},"content":{"rendered":"

\"Javascript<\/p>\n

\u5728JavaScript\u9879\u76ee\u4e2d\u5b9e\u73b0\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\u53ef\u4ee5\u901a\u8fc7\u591a\u79cd\u65b9\u5f0f\u6765\u5b8c\u6210\uff0c\u4e3b\u8981\u65b9\u6cd5\u5305\u62eclocalStorage\u3001sessionStorage\u3001IndexedDB\u3001Web SQL\u4ee5\u53caCookies<\/strong>\u3002\u8fd9\u4e9b\u6280\u672f\u5141\u8bb8\u7f51\u7ad9\u4fdd\u5b58\u6570\u636e\u5230\u7528\u6237\u7684\u6d4f\u89c8\u5668\u4e2d\uff0c\u4ece\u800c\u5728\u7528\u6237\u540e\u7eed\u8bbf\u95ee\u65f6\u53ef\u4ee5\u8bfb\u53d6\u8fd9\u4e9b\u6570\u636e\uff0c\u589e\u5f3a\u7528\u6237\u4f53\u9a8c\u3002<\/p>\n<\/p>\n

localStorage\u548csessionStorage<\/strong> \u662f\u6700\u5e38\u7528\u7684\u5b58\u50a8\u624b\u6bb5\u4e4b\u4e00\u3002localStorage<\/strong> \u63d0\u4f9b\u4e86\u4e00\u4e2a\u65e0\u671f\u9650\u5b58\u50a8\u6570\u636e\u7684\u80fd\u529b\uff0c\u800c sessionStorage<\/strong> \u5728\u7528\u6237\u4f1a\u8bdd\u7ed3\u675f\u540e\uff08\u5373\u6d4f\u89c8\u5668\u5173\u95ed\u540e\uff09\u6570\u636e\u5c31\u4f1a\u88ab\u6e05\u9664\u3002localStorage\u5bf9\u6570\u636e\u5927\u5c0f\u6709\u9650\u5236\uff0c\u4e00\u822c\u4e3a5MB\u5de6\u53f3\uff0c\u4e14\u53ea\u80fd\u5b58\u50a8\u5b57\u7b26\u4e32\u7c7b\u578b\u7684\u6570\u636e\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7 localStorage.setItem(key, value)<\/code> \u6765\u5b58\u50a8\u6570\u636e\uff0c\u901a\u8fc7 localStorage.getItem(key)<\/code> \u6765\u8bfb\u53d6\u6570\u636e\uff0c\u5e76\u901a\u8fc7 localStorage.removeItem(key)<\/code> \u6765\u5220\u9664\u5355\u4e2a\u6570\u636e\uff0c\u6216\u8005\u7528 localStorage.clear()<\/code> \u6765\u6e05\u9664\u6240\u6709\u7684\u6570\u636e\u3002\u8fd9\u4e9b\u65b9\u6cd5\u4e5f\u9002\u7528\u4e8esessionStorage\u3002<\/p>\n<\/p>\n

\u4e00\u3001LOCALSTORAGE\u7684\u4f7f\u7528<\/h3>\n<\/p>\n

localStorage<\/strong> \u662f\u6d4f\u89c8\u5668\u63d0\u4f9b\u7684\u4e00\u4e2a\u7b80\u5355\u7684API\uff0c\u5141\u8bb8\u7f51\u9875\u5b58\u50a8\u952e\u503c\u5bf9\u6570\u636e\u3002\u5b58\u50a8\u5728 localStorage \u7684\u6570\u636e\u53ef\u4ee5\u957f\u671f\u4fdd\u6301\uff0c\u5373\u4f7f\u5728\u6d4f\u89c8\u5668\u5173\u95ed\u540e\u4e0b\u4e00\u6b21\u6253\u5f00\u6d4f\u89c8\u5668\u4ecd\u7136\u5b58\u5728\uff0c\u76f4\u5230\u88ab\u660e\u786e\u5730\u5220\u9664\u3002<\/p>\n<\/p>\n

\u4f7f\u7528 localStorage \u5b58\u50a8\u6570\u636e<\/h4>\n<\/p>\n

\u5b58\u50a8\u6570\u636e\u5230 localStorage \u975e\u5e38\u7b80\u5355\uff0c\u901a\u8fc7\u8c03\u7528 localStorage.setItem()<\/code> \u65b9\u6cd5\u5b9e\u73b0\uff0c\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n<\/p>\n

localStorage.setItem('myKey', 'myValue');<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u884c\u4ee3\u7801\u5c31\u4f1a\u5c06\u952e\u4e3a myKey<\/code>\uff0c\u503c\u4e3a myValue<\/code> \u7684\u6570\u636e\u5b58\u50a8\u5230\u6d4f\u89c8\u5668\u7684 localStorage \u4e2d\u3002<\/p>\n<\/p>\n
\u4ece localStorage \u8bfb\u53d6\u6570\u636e<\/h4>\n<\/p>\n
\u8bfb\u53d6\u4e4b\u524d\u4fdd\u5b58\u7684\u6570\u636e\u4e5f\u5f88\u7b80\u5355\uff0c\u901a\u8fc7 localStorage.getItem()<\/code> \u65b9\u6cd5\u5b9e\u73b0\uff0c\u4f8b\u5b50\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
const value = localStorage.getItem('myKey');<\/p>\n
console.log(value); \/\/ \u8f93\u51fa\uff1amyValue<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e8c\u3001SESSIONSTORAGE\u7684\u4f7f\u7528<\/h3>\n<\/p>\n
sessionStorage<\/strong> \u65b9\u6cd5\u548c localStorage \u7c7b\u4f3c\uff0c\u4f46\u662f\u5b83\u662f\u7528\u4e8e\u5728\u4e00\u4e2a\u4f1a\u8bdd\u4e2d\u5b58\u50a8\u4e34\u65f6\u6570\u636e\uff0c\u5f53\u4f1a\u8bdd\u7ed3\u675f\uff08\u5373\u6d4f\u89c8\u5668\u88ab\u5173\u95ed\uff09\u540e\uff0c\u5b58\u50a8\u7684\u6570\u636e\u4e5f\u4f1a\u6d88\u5931\u3002<\/p>\n<\/p>\n
\u4f7f\u7528 sessionStorage \u5b58\u50a8\u6570\u636e<\/h4>\n<\/p>\n
\u4f7f\u7528 sessionStorage \u5b58\u50a8\u6570\u636e\u7684\u65b9\u6cd5\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
sessionStorage.setItem('sessionKey', 'sessionValue');<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u884c\u4ee3\u7801\u4f1a\u5c06\u540d\u79f0\u4e3a sessionKey<\/code>\uff0c\u503c\u4e3a sessionValue<\/code> \u7684\u6570\u636e\u4fdd\u5b58\u5728 sessionStorage \u4e2d\u3002<\/p>\n<\/p>\n
\u4ece sessionStorage \u8bfb\u53d6\u6570\u636e<\/h4>\n<\/p>\n
\u4ece sessionStorage \u8bfb\u53d6\u6570\u636e\u548c localStorage \u662f\u4e00\u6837\u7684\u8fc7\u7a0b\uff1a<\/p>\n<\/p>\n
const sessionValue = sessionStorage.getItem('sessionKey');<\/p>\n
console.log(sessionValue); \/\/ \u8f93\u51fa\uff1asessionValue<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u4e09\u3001INDEXEDDB\u7684\u4f7f\u7528<\/h3>\n<\/p>\n
IndexedDB<\/strong> \u662f\u4e00\u79cd\u5e95\u5c42 API\uff0c\u7528\u4e8e\u5728\u5ba2\u6237\u7aef\u5b58\u50a8\u5927\u91cf\u7ed3\u6784\u5316\u6570\u636e\u3002\u8fd9\u79cd\u5b58\u50a8\u662f\u5f02\u6b65\u7684\uff0c\u56e0\u6b64\u5bf9\u6027\u80fd\u7684\u5f71\u54cd\u8f83\u5c0f\uff0c\u5e76\u4e14\u4e0d\u53d7\u7f51\u9875\u54cd\u5e94\u72b6\u6001\u7684\u9650\u5236\u3002<\/p>\n<\/p>\n
\u521d\u59cb\u5316 IndexedDB \u6570\u636e\u5e93<\/h4>\n<\/p>\n
\u4f7f\u7528 IndexedDB \u9996\u5148\u8981\u521b\u5efa\u6216\u6253\u5f00\u4e00\u4e2a\u6570\u636e\u5e93\uff1a<\/p>\n<\/p>\n
let db;<\/p>\n
const request = window.indexedDB.open('myDatabase', 1);<\/p>\n
request.onerror = function(event) {<\/p>\n
    console.error('Database opening fAI<\/a>led');<\/p>\n
};<\/p>\n
request.onsuccess = function(event) {<\/p>\n
    db = request.result;<\/p>\n
    console.log('Database opened successfully');<\/p>\n
};<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728IndexedDB\u4e2d\u5b58\u50a8\u6570\u636e<\/h4>\n<\/p>\n
\u5728IndexedDB\u4e2d\u5b58\u50a8\u6570\u636e\u524d\uff0c\u9700\u8981\u521b\u5efa\u4e8b\u52a1\u548c\u5bf9\u8c61\u4ed3\u5e93\uff1a<\/p>\n<\/p>\n
const transaction = db.transaction(['myObjectStore'], 'readwrite');<\/p>\n
const store = transaction.objectStore('myObjectStore');<\/p>\n
const data = { id: '1', info: { name: 'John Doe', age: 30 } };<\/p>\n
const request = store.add(data);<\/p>\n
request.onsuccess = function() {<\/p>\n
    console.log('Data saved to the database');<\/p>\n
};<\/p>\n
request.onerror = function() {<\/p>\n
    console.error('Error in saving data');<\/p>\n
};<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u56db\u3001COOKIES\u7684\u4f7f\u7528<\/h3>\n<\/p>\n
Cookies<\/strong> \u662f\u5b58\u50a8\u5728\u7528\u6237\u6d4f\u89c8\u5668\u4e2d\u7684\u5c0f\u7247\u6bb5\u6570\u636e\uff0c\u901a\u5e38\u7528\u4e8e\u8ddf\u8e2a\u7528\u6237\u4f1a\u8bdd\u548c\u5b58\u50a8\u7528\u6237\u504f\u597d\u8bbe\u7f6e\u3002\u4f46\u5bf9\u4e8e\u5b89\u5168\u6027\u8981\u6c42\u8f83\u9ad8\u7684\u6570\u636e\u4e0d\u63a8\u8350\u4f7f\u7528cookies\u6765\u5b58\u50a8\u3002<\/p>\n<\/p>\n
\u8bbe\u7f6eCookies<\/h4>\n<\/p>\n
\u8bbe\u7f6ecookie\u53ef\u4ee5\u901a\u8fc7\u7b80\u5355\u7684JavaScript\u4ee3\u7801\u5b8c\u6210\uff1a<\/p>\n<\/p>\n
document.cookie = "username=John Doe;expires=Thu, 18 Dec 2023 12:00:00 UTC;path=\/";<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u8fd9\u884c\u4ee3\u7801\u521b\u5efa\u4e86\u4e00\u4e2a\u540d\u4e3a username<\/code> \u7684cookie\uff0c\u5e76\u5c06\u5176\u503c\u8bbe\u7f6e\u4e3a John Doe<\/code>\u3002\u540c\u65f6\u8bbe\u7f6e\u4e86\u4e00\u4e2a\u8fc7\u671f\u65f6\u95f4\u548c\u8def\u5f84\u3002<\/p>\n<\/p>\n
\u8bfb\u53d6Cookies<\/h4>\n<\/p>\n
\u8bfb\u53d6cookie\u4e5f\u975e\u5e38\u7b80\u5355\uff0c\u4f60\u53ef\u4ee5\u8fd9\u6837\u505a\uff1a<\/p>\n<\/p>\n
let x = document.cookie;<\/p>\n
console.log(x); \/\/ \u8f93\u51fa\u6240\u6709\u7684cookie<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u6574\u4e2acookie\u5b57\u7b26\u4e32\u7684\u683c\u5f0f\u662f\u4e00\u4e2a\u952e\u503c\u5bf9\u5e8f\u5217\uff0c\u7528\u5206\u53f7\u5206\u9694\u3002\u56e0\u6b64\uff0c\u53ef\u80fd\u9700\u8981\u67d0\u79cd\u89e3\u6790\u903b\u8f91\u6765\u83b7\u53d6\u7279\u5b9acookie\u7684\u503c\u3002<\/p>\n<\/p>\n
\u4e94\u3001WEB SQL\u7684\u4f7f\u7528<\/h3>\n<\/p>\n
Web SQL<\/strong> \u662f\u4e00\u79cd\u5c3d\u7ba1\u5df2\u7ecf\u4e0d\u63a8\u8350\u4f7f\u7528\uff0c\u4f46\u4ecd\u7136\u6709\u4e9b\u8001\u7684\u5e94\u7528\u7a0b\u5e8f\u5728\u4f7f\u7528\u7684Web\u6280\u672f\u3002\u5b83\u5141\u8bb8\u7f51\u9875\u521b\u5efa\u3001\u64cd\u7eb5\u6570\u636e\u5e93\u8868\u4ee5\u53ca\u67e5\u8be2\u6570\u636e\uff0c\u5176\u64cd\u4f5c\u7c7b\u4f3c\u4e8e\u4f20\u7edf\u7684SQL\u6570\u636e\u5e93\u3002<\/p>\n<\/p>\n
\u521b\u5efaWeb SQL\u6570\u636e\u5e93<\/h4>\n<\/p>\n
\u521b\u5efaWeb SQL\u6570\u636e\u5e93\u7684\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
var db = openDatabase('mydb', '1.0', 'Test DB', 2 * 1024 * 1024);<\/p>\n
db.transaction(function (tx) {  <\/p>\n
    tx.executeSql('CREATE TABLE IF NOT EXISTS LOGS (id unique, log)');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5411Web SQL\u6570\u636e\u5e93\u63d2\u5165\u6570\u636e<\/h4>\n<\/p>\n
\u6570\u636e\u63d2\u5165\u8fc7\u7a0b\u5982\u4e0b\uff1a<\/p>\n<\/p>\n
db.transaction(function (tx) {  <\/p>\n
    tx.executeSql('INSERT INTO LOGS (id, log) VALUES (1, "foobar")');<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u67e5\u8be2Web SQL\u6570\u636e\u5e93\u6570\u636e<\/h4>\n<\/p>\n
\u67e5\u8be2\u6570\u636e\u7684\u8fc7\u7a0b\u7c7b\u4f3c\uff1a<\/p>\n<\/p>\n
db.transaction(function (tx) {  <\/p>\n
    tx.executeSql('SELECT * FROM LOGS', [], function (tx, results) {<\/p>\n
        var len = results.rows.length, i;<\/p>\n
        for (i = 0; i < len; i++) {<\/p>\n
            alert(results.rows.item(i).log);<\/p>\n
        }<\/p>\n
    });<\/p>\n
});<\/p>\n
<\/code><\/pre>\n<\/p>\n
\u5728\u5b9e\u73b0\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\u7684\u8fc7\u7a0b\u4e2d\uff0c\u9009\u62e9\u5408\u9002\u7684\u65b9\u6cd5\u5f88\u91cd\u8981\u3002\u8fd9\u53d6\u51b3\u4e8e\u4f60\u60f3\u5b58\u50a8\u7684\u6570\u636e\u7c7b\u578b\u3001\u6570\u91cf\u3001\u662f\u5426\u9700\u8981\u8de8\u4f1a\u8bdd\u6301\u4e45\u4fdd\u5b58\u3001\u5bf9\u5b89\u5168\u6027\u7684\u8981\u6c42\u7b49\u56e0\u7d20\u3002\u5bf9\u4e8e\u5927\u591a\u6570\u7b80\u5355\u7684\u7528\u4f8b\uff0clocalStorage\u6216sessionStorage\u662f\u7406\u60f3\u7684\u9009\u62e9\uff0c\u800c\u5bf9\u4e8e\u66f4\u590d\u6742\u6216\u91cf\u8f83\u5927\u7684\u6570\u636e\u5b58\u50a8\u9700\u6c42\uff0c\u5219\u53ef\u80fd\u9700\u8981\u8003\u8651IndexedDB\u3002Cookies\u53ef\u4ee5\u7528\u4e8e\u5b58\u50a8\u5c0f\u91cf\u7684\u7528\u6237\u4e2a\u6027\u5316\u6570\u636e\uff0c\u4f46\u56e0\u4e3a\u5b89\u5168\u548c\u6027\u80fd\u539f\u56e0\u7684\u8003\u8651\uff0c\u5bf9\u4e8e\u65b0\u9879\u76ee\u5e94\u63a7\u5236\u4f7f\u7528\uff0c\u5e76\u8003\u8651\u66ff\u4ee3\u65b9\u6848\u3002Web SQL\u867d\u7136\u4e0d\u518d\u63a8\u8350\u4f7f\u7528\uff0c\u4f46\u4ecd\u9700\u4e86\u89e3\uff0c\u7279\u522b\u662f\u5f53\u9700\u8981\u7ef4\u62a4\u4e00\u4e9b\u8001\u9879\u76ee\u65f6\u3002<\/p>\n<\/p>\n
\u76f8\u5173\u95ee\u7b54FAQs\uff1a<\/strong><\/h2>\n
1. \u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\u662f\u4ec0\u4e48\uff1f<\/strong><\/p>\n
\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\u662f\u6307\u5728\u7528\u6237\u7684\u6d4f\u89c8\u5668\u4e2d\u5b58\u50a8\u6570\u636e\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\u5b83\u5141\u8bb8\u7f51\u7ad9\u5c06\u6570\u636e\u5b58\u50a8\u5728\u7528\u6237\u7684\u8ba1\u7b97\u673a\u4e0a\uff0c\u4f7f\u5f97\u7528\u6237\u53ef\u4ee5\u5728\u91cd\u65b0\u8bbf\u95ee\u7f51\u7ad9\u65f6\u83b7\u53d6\u5230\u4e4b\u524d\u4fdd\u5b58\u7684\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u518d\u6b21\u4ece\u670d\u52a1\u5668\u8bf7\u6c42\u3002<\/p>\n
2. \u6709\u54ea\u4e9b\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\uff1f<\/strong><\/p>\n
\u6709\u591a\u79cd\u65b9\u5f0f\u53ef\u4ee5\u5b9e\u73b0\u6d4f\u89c8\u5668\u672c\u5730\u5b58\u50a8\uff0c\u5176\u4e2d\u6700\u5e38\u89c1\u7684\u65b9\u5f0f\u5305\u62ec\uff1a<\/p>\n
    \n
  • \n
    Cookie\uff1aCookie \u662f\u4e00\u79cd\u5c0f\u578b\u7684\u6587\u672c\u6587\u4ef6\uff0c\u53ef\u4ee5\u7531\u7f51\u7ad9\u5b58\u50a8\u5728\u7528\u6237\u7684\u8ba1\u7b97\u673a\u4e0a\u3002\u5b83\u53ef\u4ee5\u7528\u6765\u4fdd\u5b58\u7528\u6237\u7684\u504f\u597d\u8bbe\u7f6e\u3001\u767b\u5f55\u4fe1\u606f\u7b49\uff0c\u4f46\u662f\u5b58\u50a8\u5bb9\u91cf\u6709\u9650\uff0c\u4e00\u822c\u53ea\u80fd\u5b58\u50a8\u51e0\u4e2a KB \u7684\u6570\u636e\u3002<\/p>\n<\/li>\n
  • \n
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    • \n
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