How to change font size using Vue.js

Nowadays, Vue.js is becoming more and more popular. It is a progressive JavaScript-based framework that helps developers build rich user interfaces. In Vue.js, there are many ways to change font size easily. In this article, we will learn how to change font size using Vue.js.

1. Set the font size in the Vue component

In the Vue component, we can use style binding to set the font size. Style binding allows us to set an object containing CSS properties and values. We can associate this object with an element in the component's template to change the font size.

For example, we can create a style object that contains a font-size attribute and the corresponding value:

data() {
  return {
    fontSize: '16px'
  }
}

We can then use style binding in the component's template to use this The style object is applied to the element:

<template>
  <div :style="{fontSize: fontSize}">
    这是一段文字
  </div>
</template>

At this point, the font size will be set to 16 pixels.

If we need to change the font size, we can directly change the value of fontSize:

this.fontSize = '20px';

As the value of fontSize changes, the font size of the element bound to it will also automatically change.

2. Use calculated properties

We can also use calculated properties to change the font size. Computed properties allow us to calculate property values ​​based on data. We can provide a function for the computed property and the function will return the value we want.

For example, we can create a computed property to return the font size:

computed: {
  fontSize() {
    return this.fontSizeValue + 'px';
  }
}

We can define a fontSizeValue value in the data and then associate the computed property with a style binding to change the font Size:

<template>
  <div :style="{fontSize: fontSize}">
    这是一段文字
  </div>
</template>

Now, we can set the value of fontSizeValue, and the calculated property will calculate the font size based on this value:

this.fontSizeValue = 20;

3. Use mixin

If we need to Using the same CSS styles in multiple components, we can define these styles as mixins. A mixin is an object that contains options to be incorporated into a component. We can add style attributes to the mixin and then associate the mixin with multiple components.

For example, we can create a mixin to define the font size:

const fontSizeMixin = {
  data() {
    return {
      fontSize: '16px'
    }
  }
}

We can then associate this mixin with any number of components we need by using the mixins option:

export default {
  mixins: [fontSizeMixin],
  // ...
}

Now, we can use the fontSize property in the component's template to set the font size, just like with other data properties:

<template>
  <div :style="{fontSize: fontSize}">
    这是一段文字
  </div>
</template>

We can set the fontSize value to any pixel, or in the data Define it so that the size changes dynamically.

Summary

In Vue.js, there are many ways to change font size. We can use style binding in components, use computed properties or use mixins. Each method has its own advantages and disadvantages, choose according to actual needs. Either way, you can easily change the font size, improving the user experience.

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