How to change the color in vue

Vue is a popular front-end framework through which you can quickly build modern, interactive web applications. In the process of web application development, changing the color of components is a very common requirement. Let me introduce how to change the color in Vue.

1. Modify style attributes directly

Vue can directly access the DOM elements of each component, so you can change the color of the component by modifying the CSS properties of the DOM elements. For example, we can use Vue's ref attribute to obtain the DOM element of the component, and then modify its style attribute. The sample code is as follows:

<template>
  <div ref="myComp" class="my-component"></div>
</template>

<script>
export default {
  methods: {
    changeColor() {
      this.$refs.myComp.style.backgroundColor = 'red';
    }
  }
}
</script>

<style>
.my-component {
  width: 200px;
  height: 200px;
  background-color: blue;
}
</style>

In the above code, we first add a ref attribute to the component's template, and the value of this attribute is myComp. Then, a changeColor method is added to the component's methods to change the background color of the component. In the method, we obtain the DOM element of the component through this.$refs.myComp, and then modify its style attribute.

2. Use computed properties to calculate styles

Changing the style properties of a component can not only operate directly on the DOM element, but also calculate the style properties through calculated properties, and then use them in the template Apply these calculated styles in . This approach allows us to handle styles more elegantly and improves code readability. The sample code is as follows:

<template>
  <div :style="{backgroundColor: bgColor}" class="my-component"></div>
</template>

<script>
export default {
  data() {
    return {
      isRed: true
    }
  },
  computed: {
    bgColor() {
      return this.isRed ? 'red' : 'blue';
    }
  }
}
</script>

<style>
.my-component {
  width: 200px;
  height: 200px;
}
</style>

In the above code, we use the calculated property bgColor to calculate the background color of the component. Depending on the value of the isRed property, the calculated property will return different background colors. Then, bind the background color to the component's style attribute through the v-bind directive in the component's template.

3. Use class binding

Changing the style attributes of a component can not only operate directly on the DOM element, but also change the style attributes by binding class. This method is often used with computed properties and allows us to work with styles more conveniently. The sample code is as follows:

<template>
  <div :class="{red: isRed}" class="my-component"></div>
</template>

<script>
export default {
  data() {
    return {
      isRed: true
    }
  },
  computed: {
    bgColor() {
      return this.isRed ? 'red' : 'blue';
    }
  }
}
</script>

<style>
.my-component {
  width: 200px;
  height: 200px;
}
.red {
  background-color: red;
}
.blue {
  background-color: blue;
}
</style>

In the above code, we use the :class directive to bind the component to the red class. If the value of the isRed attribute is true, then the component will apply the red class, which will change Its background color is red. Then, two classes, red and blue, are defined in the style to set different background colors.

Summary

The above are the three methods for Vue to change the color of components: directly modify the style properties, use calculated properties to calculate the style, and use class binding. Although the methods are different, they can all help us easily change the color of components to beautify web applications.

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