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                ## webStorage * webStorage分為localStorage和sessionStorage * localStorage類似于一個瀏覽器中的數據庫,可以存儲數據用于被同一個域名,同一個協議,同一個端口的頁面訪問 * `localStorage.setItem("key","value")`存儲指定key-value形式的數據 * `localStorage.getItem("key")`獲取指定key的值 * `localStorage.removeItem("key")`刪除指定key的值 * `localStorage.clear()`清空所有的localStorage中的值 ## 錯誤處理機制 * JavaScript存在預編譯的功能,如果我們不小心打錯了關鍵字或者少寫了括號,JavaScript代碼就不會通過預編譯 * finallly中的語句,無論是否會發生錯誤,都會執行 ```javaScript var ab; try { ab = b + 1 } catch(e) { //JavaScript引擎構建出的這樣一個error對象 console.log(e.message); //錯誤的信息 } finally { //finallly中的語句,無論是否會發生錯誤,都會執行 if(ab !== 3) { ab = 3; } } console.log(ab); console.log("bbb"); ```
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