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                * 同步:瀏覽器訪問服務器請求,用戶看得到頁面刷新,重新發請求,等請求完,頁面刷新,新內容出現,用戶看到新內容,進行下一步操作 * 異步:瀏覽器訪問服務器請求,用戶正常操作,瀏覽器后端進行請求。等請求完,頁面不刷新,新內容也會出現,用戶看到新內容
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