What to do if the uniapp class style does not take effect

With the continuous development of mobile application development technology, uniapp, as a cross-platform development framework based on Vue.js, has been welcomed by more and more developers. However, when developing with uniapp, you sometimes encounter the problem that styles do not take effect, especially when using class styles. This article will explore the reasons and solutions for class styles in uniapp not taking effect.

1. Reasons why class style does not take effect

1. Level issues

In uniapp, the elements in the page are divided into component and view layers. . The styles of the component layer only take effect in the current component, while the styles of the view layer take effect globally. When we define a class style, if there is a class style with the same name in the current component and view layer, the style in the component layer will override the style in the view layer, causing the style we define to have no effect.

2. Scope issue

In vue, in order to avoid style conflicts, you can use the scoped attribute to add scope to css. In this way, the css will only be applied to the current component. However, in uniapp, the scoped attribute doesn't work because uniapp puts the styles in the head tag, causing the scope to be lost. Therefore, in uniapp, we need to use the class selector to define the class style, so as to ensure the scope of the style.

3. Style loading problem

In uniapp, since the style is placed in the head tag, there may be a style loading problem. Especially when an external style sheet is introduced, the style sheet may not be loaded in time due to network delays and other reasons, causing the defined class style to fail to take effect.

2. Solution

1. Change the class name

To avoid conflicts with other styles, you can add the name of the component or other prefixes in front of the class name , to distinguish class styles in different components and different levels.

2. Use the !important keyword

When defining a class style, we can use the !important keyword to force the application of the current style, even if other styles have priority changes high case. However, when using the !important keyword, be careful not to overuse it, so as not to affect the application of other styles.

3. Standardized naming

When defining class styles, pay attention to standardized naming to avoid Chinese or special characters. At the same time, pay attention to upper and lower case writing to avoid case-sensitive issues that may cause styles to fail to take effect.

4. Check the network connection

When the style cannot take effect, we need to check whether the network connection is normal to ensure that the style sheet can be loaded in time.

In short, when using uniapp to develop, we need to pay attention to the reasons and solutions for the styles to take effect to ensure the normal operation of the application. Hope this article is helpful to everyone.

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