How to clear h5 user cache in uniapp

In UniApp development, we often need to develop and test in H5 pages. However, during the development and testing process, you may encounter some problems, such as errors caused by page caching or inconsistencies between the data cached by H5 users and the actual situation. At this time, we need to clear the H5 user cache.

UniApp provides a method to clear H5 user cache. Let’s introduce the specific steps below.

Steps

Step One: Configure the route to clear the cache in manifest.json

In the manifest.json of the project, we need to configure the route that can clear the cache. Open the manifest.json file and add the "clear" node under the "pages" node, as shown below:

"pages": [
  {
    "path": "pages/index/index",
    "style": {
      "navigationBarTitleText": "首页"
    }
  },
  {
    "path": "pages/about/about",
    "style": {
      "navigationBarTitleText": "关于"
    }
  },
  {
    "path": "pages/clear/clear", // 添加clear节点
    "style": {
      "navigationBarTitleText": "清除缓存"
    }
  }
]

The above code configures a route that can clear the cache. We can design the page of this route into a You can clear cached pages, such as adding a button. Click this button to clear the cache.

Step 2: Add the cache clearing code to the cache clearing page

In the cache clearing page, we need to add the cache clearing code. Here we can use the uni.clearStorage() method to clear all caches, or use the localStorage.removeItem() method to clear a specified cache.

Code example to clear all caches:

<template>
  <view>
    <button @click="clearCache">清除缓存</button>
  </view>
</template>

<script>
export default {
  methods: {
    clearCache() {
      uni.clearStorage();
      uni.showToast({
        title: '缓存清除成功'
      });
    }
  }
}
</script>

In the above code, we put the uni.clearStorage() method in the click event of the button. After clicking the button, calling this method can clear all cache. At the same time, we also added UniApp's Toast component in the cache clearing method to prompt the user that the cache clearing is successful.

Code sample to clear the specified cache:

<template>
  <view>
    <button @click="clearCache">清除缓存</button>
  </view>
</template>

<script>
export default {
  methods: {
    clearCache() {
      localStorage.removeItem('key');
      uni.showToast({
        title: '缓存清除成功'
      });
    }
  }
}
</script>

Compared with the above code sample to clear all caches, the code here is slightly different. We used the localStorage.removeItem('key') method to clear the specified cache. Among them, 'key' is the cache key name we need to clear.

Step 3: Jump to the page that clears the cache

Finally, we need to add code that jumps to the page that clears the cache in other pages. Here we can use the routing jump function of UniApp to jump to the page that clears the cache through the uni.navigateTo() method.

Code example:

<template>
  <view>
    <button @click="clearCache">清除缓存</button>
  </view>
</template>

<script>
export default {
  methods: {
    clearCache() {
      uni.navigateTo({
        url: '/pages/clear/clear' // 跳转到清除缓存页面
      });
    }
  }
}
</script>

In other pages, we use the uni.navigateTo() method to jump to the page that clears the cache.

Summary

In general, it is not difficult to clear the cache of H5 users. You only need to configure the route to clear the cache in manifest.json, and then add clearing to the page of the route. Cached code, and finally add the code to jump to the page that clears the cache in other pages. Depending on the actual situation, you can choose to clear all caches or specify caches.

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