Why is vue not created with class?

Why vue is not created with class

Vue is a very popular JavaScript framework, mainly used to build user interfaces. In vue, we usually use template to create html templates, and then use JavaScript to provide data and behavior for it. However, unlike traditional HTML, Vue does not use class as a way to define style classes, but uses a method called "binding" to manage styles.

Why doesn’t vue use class?

The reason why Vue does not use classes is mainly because Vue does not want developers to repeatedly write a large amount of html and style code. Traditional html and css code is often very verbose, especially when dealing with large and complex web applications, which can be very complex and difficult to maintain. Therefore, in order to improve development efficiency and maintainability, Vue chose to use Template binding to achieve more flexible operation effects.

In Vue, the values ​​of styles and classes can be implemented through dynamic binding. This approach allows developers to more precisely define the state of page elements without having to write a large amount of CSS for different states.

How to bind styles and classes in Vue?

In Vue, we can use v-bind to bind classes and styles. Suppose you want to add a red background. In ordinary html, we can write like this:

<div class="bg-red"></div>

But in Vue, we can write like this:

<div v-bind:class="{ 'bg-red': isRed }"></div>

Here isRed is used as a variable, It can be stored in the data() function and dynamically change the class style by changing its value.

If you want to add multiple classes, you can use the following code:

<div v-bind:class="{ 'bg-red': isRed, 'font-bold': isBold }"></div>

Here you can judge and add styles bg-red and font-bold at the same time, and a Boolean can be nested in each style definition. Variable, used as a condition to change the class.

In addition, to implement dynamic binding of CSS in Vue, you can write like this:

<div v-bind:style="{ color: activeColor, fontSize: fontSize + 'px' }"></div>

The activeColor and fontSize variables here can be obtained through the data() function, by changing these two values. Dynamically change styles.

Summary

In Vue, the dynamic binding method of class styles allows developers to operate styles more conveniently. This approach shows particularly good performance and maintainability in large web applications, while reducing the amount of tedious code writing. It should be noted that style binding in Vue does not yet support pseudo-classes and pseudo-elements, such as :hover and ::before. These styles need to be implemented using traditional CSS.

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