Relevant settings of wechat applet cache expiration time (recommended)

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Introduction to wechat applet caching mechanism

Which caches must expire

How to write it

Introduction to wechat applet caching mechanism

Each wechat applet can have its own local cache , Can pass wx.setStorage（wx.setStorageSync）、wx.getStorage（wx.getStorageSync）、wx.clearStorage（wx.clearStorageSync） You can set the local cache 、 Acquisition and cleanup .

However, wechat has set an infinite expiration time limit for the cache by default , This is for our small program development , It's very bad .

Which caches must expire

I am developing a project , The user gets one through a third-party login token, Every request must be accompanied by token, however token The time limit is 30 minute .

therefore token It is necessary to treat it as a cache , But you must set the data of cache time limit .

How to write it

After the user logs in successfully , Set the expiration time 、token Stored in the cache together ：

// Set up token cache wx.setStorageSync('token', res.data.token);// current time var timestamp = Date.parse(new Date());// Add the expiration date var expiration = timestamp + 1200000; // cache 20 minute // Deposited in the cache wx.setStorageSync('data_expiration', expiration);

stay app.js In the entry file , Whether the monitoring timed out ：

// Whether the cache is out of date _isExpiration() { // current time var timestamp = Date.parse(new Date()); // Expiration time in cache var data_expiration = wx.getStorageSync("data_expiration"); // If it's not in the cache data_expiration, It doesn't mean token, Not signed in yet if (data_expiration) { // If I run out of time , Clear cache , Log back in if (timestamp > data_expiration) { wx.clearStorageSync(); return true; }else{ return false; } } return true; },

This is the end of this article about the relevant settings of wechat applet cache expiration time , For more information about the expiration time of wechat applet cache, please search the previous articles on SDN or continue to browse the relevant articles below. I hope you will support SDN more in the future ！