uniapp data binding failed

Recently, when developing a web application based on uniapp, I encountered a data binding problem. When I was writing the Vue component, I used the data binding function provided by the uniapp framework, but I encountered a situation where the data could not be rendered to the page normally. After hard debugging, I finally solved this problem and share my experience with you here.

Question:

In uniapp, data binding is generally by defining the data attribute in the vue component, and binding the data to the component template through "{{}}" syntax. On the corresponding html element, such as the following sample component:

<template>
  <div>
    <p>姓名：{{name}}</p>
    <p>年龄：{{age}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      name: '张三',
      age: 18
    }
  }
}
</script>

However, in my application, the data cannot be correctly rendered to the page no matter what. I checked the code many times, including variable names, references to templates and components, and found no errors. I even assigned the variable manually in the component and was able to read the value correctly, but the data still didn't render correctly in the template.

Solution:

When I was about to give up, I thought of a possibility: whether it was caused by a version problem with the uniapp framework. Because I introduced some third-party libraries into the project, including JS plug-ins and CSS frameworks, etc., the vue library that is inconsistent with the uniapp version may be used in these libraries.

So, before introducing the component, I added the following two lines of code:

import Vue from 'vue'
Vue.config.productionTip = false

Among them, the first line of code is to manually introduce the vue library and register it globally, while the second line of code is Used to disable prompt information in vue production mode. After running the project, the data was finally successfully rendered to the page!

Reason:

I searched for some information on the Internet and found a passage mentioned in the official uniapp documentation:

"Developers can manually download the latest version. The runtime part of uni-app Vue, and then configure resolve.alias in the project webpack configuration to specify it as a new version, thus replacing the baymax runtime "

In other words, the uniapp framework uses its own encapsulation by default vue.js, rather than the official vue.js, which may cause conflicts with some third-party libraries.

Conclusion:

The above are the problems I encountered and their solutions. I hope my experience can be helpful to developers who need to use the uniapp framework for development. In general, the problem of data binding failure is usually caused by issues such as version compatibility. You need to pay attention to these details when writing code to avoid problems.

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