Unable to open a single page of uniapp

With the popularization of mobile Internet, mobile applications have become an indispensable part of major enterprises and institutions, and are also a platform for developers to carry out technological innovation and practice. With the continuous evolution of various technologies, uni-app has become the preferred framework for many companies and developers, with the advantages of cross-platform, efficient and easy-to-use, and flexible expansion.

However, like other technologies, uni-app will also have some problems, which require in-depth exploration and solution during use. This article will focus on the common problems and solutions that cannot be brought up on a separate page of uni-app.

1. Problem description

When a developer uses uni-app for development, sometimes a single page cannot be loaded. The specific performance is as follows: the page can be accessed normally in the application, but when the page is opened in the address bar, the page cannot be displayed, and only the loading prompt is displayed until the 404 error page is finally displayed.

2. Cause of the problem

Let us first look at what is the cause of this problem.

In front-end development, there is a very important concept - routing. The role of routing is to provide developers with the possibility to jump between pages. In uni-app, routing is implemented through vue-router, that is, page jumps are performed by setting the mapping relationship between paths and components in the routing table.

As for the problem that a single page of uni-app cannot be called up, the main reason is that the correct mapping relationship is not set in the routing table, or the reference path of the component is incorrect.

3. Problem Solving

Now that we know the cause of the problem, the next step is to solve the problem. Several solutions are summarized below.

1. Set the correct routing address

In uni-app, routing settings are implemented through the pages.json file. If there is a situation where a single page cannot be called out, then we need to check whether the correct routing address is set in the pages.json file. Typically, the routing address can be a relative path or an absolute path.

For example, we have set a mapping relationship in the pages.json file:

{
  "pages": [
    {
      "path": "pages/index/index",
      "style": {
        "navigationBarTitleText": "首页"
      }
    },
    {
      "path": "pages/list/list",
      "style": {
        "navigationBarTitleText": "列表页"
      }
    }
  ]
}

The path attribute is the routing address. You can see that we have set the home page and list page. Mapping relations. If we need to add a separate 404 page, we only need to add it like this:

{
  "pages": [
    {
      "path": "pages/index/index",
      "style": {
        "navigationBarTitleText": "首页"
      }
    },
    {
      "path": "pages/list/list",
      "style": {
        "navigationBarTitleText": "列表页"
      }
    },
    {
      "path": "pages/404/404",
      "style": {
        "navigationBarTitleText": "404错误页面"
      }
    }
  ]
}

After adding it, we only need to reference this path in the component.

2. Check the component reference path

Another common problem is that the component reference path is incorrect. In vue, we can use relative paths or absolute paths for component references. A relative path refers to positioning the component to be introduced upward or downward based on the location of the current file. The absolute path is the path starting from the project root directory.

If the reference path in the component is incorrect, errors such as "404 page not found" will appear.

3. Use the uni.navigateTo method

In uni-app, we can use the uni.navigateTo method to jump to the page. Through this method, we can jump to pages more flexibly, and at the same time, we can avoid the problem that a single page cannot be called out.

For example, there is a button on our homepage, and we need to jump to the list page:

<template>
  <view class="index">
    <button type="default" @click="toList">跳转到列表页</button>
  </view>
</template>

<script>
  export default {
    methods: {
      toList() {
        uni.navigateTo({
          url: "/pages/list/list"
        });
      }
    }
  };
</script>

By calling the uni.navigateTo method, we can specify the jump through the url attribute path, and parameters can also be passed.

To sum up, the main reason for the problem of being unable to call up a separate page is routing problems and component reference path problems. The solution is to correctly set the routing address and check the component reference path. You can also use the uni.navigateTo method to jump to the page. Only by deeply understanding and mastering these methods can we better use uni-app for development.

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