Cache updating method, terminal and system

Abstract

The invention discloses a cache update method, terminal and system. The cache update method includes: starting the web application, recording the start time of the web application, receiving the application download request of the web application, if there is AJAX cache data corresponding to the application download request stored locally, obtaining the record in the AJAX cache data and downloading it to the background server The timestamp of the sending time, to determine whether the startup time is less than or equal to the timestamp, if yes, there is no need to update the AJAX cache data; otherwise, send the data verification request of the AJAX cache data to the background server corresponding to the application download request, according to the return of the background server Data update AJAX cache data. This technical solution only verifies the cached data downloaded before the web application is started, and does not verify the cached data downloaded after the web application is started, thereby ensuring the correctness of the cached data at a relatively small cost.

Description

Technical field [0001] The present invention relates to the technical field of web page development, in particular to a cache update method, terminal and system. Background technique [0002] AJAX refers to Asynchronous JavaScript and XML (Asynchronous JavaScript and XML), AJAX is a technology used to create interactive Web applications. Through AJAX, JavaScript can use JavaScript's XMLHttpRequest object to directly communicate with the server. Through this object, JavaScript can exchange data with the Web server without reloading the page. [0003] The existing standard Http cache and Html5's local storage technology localStorage can both be used to provide data for offline applications when the network is disconnected. [0004] During the research and practice of the prior art, the inventor found that the prior art has at least the following problems: Html5's local storage technology localStorage will not eliminate and update cached data by itself, and storage space is limited. A...

AI Technical Summary

Problems solved by technology

[0004] During the research and practice of the existing technology, the inventor found that the existing technology has at least the following problems: Html5's local storage technology localStorage will not eliminate and update cached data by itself, and the storage space is limited

Although the standard Http cache can automatically eliminate the cache by setting the cache timeout time, the time granularity is not easy to control, and the setting is too large or too small to meet the actual needs; although you can add the If-Modify-Since header to the request to get the latest Data, but each request needs to be verified, and a network connection needs to be initiated, resulting in low update efficiency

The above two solutions are only to solve the storage problem, and cannot effectively update the data synchronously with the background server, and cannot guarantee the correctness of the cached data at a small cost

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