How does uniapp realize the function of scanning the QR code to jump to the local specified page?

Uniapp (full name Universal Application, referred to as uni) is a cross-platform application development framework open sourced by DCloud. It can be developed using vue syntax and supports publishing to multiple platforms at the same time, such as WeChat applet, Alipay applet, H5 page, iOS, Android, etc. In actual development, we often need to use the code scanning function to jump to a local specified page. This article will introduce how to use the QR code scanning function in Uniapp to jump to a local specified page.

1. Preconditions

Before using the code scanning function to jump, you need to ensure that the corresponding pages have been built locally, such as product details pages, shopping cart pages, etc. At the same time, you also need to install the code scanning plug-in "uni.scanCode" that comes with uniapp.

2. Code implementation

1. Import the code scanning plug-in

In the pages that need to use the code scanning function, we need to import the uni.scanCode plug-in first. The method of importing the plug-in is as follows:

uni.scanCode({
  success: function (res) {
    console.log(res);
  }
});

2. Analyze the QR code scanning results

After using the QR code scanning function, we need to obtain the QR code scanning results and jump to the local page based on the QR code scanning results. The method of parsing the QR code scan results is as follows:

uni.scanCode({
  success: function (res) {
    // res.result中保存了扫码结果的字符串信息
    console.log(res.result);
  }
});

3. Jump to the specified page

After parsing the QR code scan results, we need to jump to the specified page based on the QR code scan results. Suppose we need to jump to the product details page, then we can use the uni.navigateBack method to jump to the corresponding page after parsing the scan code results. The code to jump to the specified page is as follows:

uni.scanCode({
  success: function (res) {
    // res.result中保存了扫码结果的字符串信息
    console.log(res.result);
    
    // 初始化路由路径
    let url = '';
    
    // 根据扫码结果设置路由路径
    if(res.result === 'scan_product_detail') {
      url = '/pages/productDetail/productDetail';
    } else if(res.result === 'scan_shopping_cart') {
      url = '/pages/shoppingCart/shoppingCart';
    } else {
      url = '/pages/index/index';
    }
    
    // 使用uni.navigateBack方法跳转到指定页面
    uni.navigateTo({
      url: url
    });
  }
});

3. Notes

When using the code scanning function to jump, you need to pay attention to the following points:

1. The string information of the scan code result needs to be consistent with the jump path of the local page.

2. The jump path of the local page needs to be configured in the pages.json file of the uniapp project.

3. When using the uni.navigateTo method to jump, you need to pay attention to the method of passing parameters. If you need to pass parameters, you can use the query parameters in the URL or use the uni.setStorageSync method for local data storage.

4. Summary

Through the introduction of this article, we have learned how to use the code scanning function to jump to the local specified page in Uniapp, and have mastered the corresponding code implementation methods and precautions . After learning this skill, we can more conveniently implement the code scanning jump function and improve development efficiency and user experience.

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