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                ThinkChat2.0新版上線,更智能更精彩,支持會話、畫圖、視頻、閱讀、搜索等,送10W Token,即刻開啟你的AI之旅 廣告
                # localStorage永久存儲 ## 添加數據 ``` localStorage.setItem('ym','{a:"b"}') ``` ## 獲取數據 ``` localStorage.getItem('ym') ``` # sessionStorage 臨時會話存儲 瀏覽器關閉即消失,一般用來存儲用戶的信息。關掉瀏覽器后,需要重新登錄。用法同上。 # cookie、localStorage、sessionStorage 區別和共同點 <table> <tr> <td>特性</td> <td>cookie</td> <td>sessionStorage</td> <td>localStorage</td> </tr> <tr> <td>生命周期</td> <td>生成時就會被指定一個maxAge值,這就是cookie的生存周期,在這個周期內cookie有效,默認關閉瀏覽器失效</td> <td>頁面會話期間可用</td> <td>除非數據清除,否則 一直存在</td> </tr> <tr> <td>數據大小</td> <td>4kb左右(因為每次http請求都會攜帶cookie)</td> <td colspan="2">一般5M或者更大</td> </tr> <tr> <td>與服務器通信</td> <td>對服務器的請求來傳遞,每次都會攜帶在HTTP請求頭中,如果使用cookie保存過多數據會帶來性能問題</td> <td colspan="2">數據不是由每個服務器請求傳遞的,而是只有在請求時使用數據,不參與和服務器的通信</td> </tr> <tr> <td>易用性</td> <td>cookie需要自己封閉setCookie,getCookie</td> <td colspan="2">可以用原生接口,也可以再次封閉來對Object和Array有更好的支持</td> </tr> <tr> <td>共同點</td> <td colspan="3">都保存在瀏覽器端,和服務器端的session機制不同</td> </tr> </table>
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