vue changes css style

Vue is a popular JavaScript framework that helps developers build complex web applications. Vue provides a useful set of features and tools that make building dynamic user interfaces easier. One of the features is the ability to easily change CSS styles.

In Vue, you can use the v-bind directive to dynamically bind CSS styles. The v-bind directive can bind the data attributes of a Vue instance to the attributes of a DOM element. For example, you can use the v-bind:class directive to dynamically bind a CSS class name. The specific usage is as follows:

<div v-bind:class="{ active: isActive }"></div>

In the above example, isActive is a property of a Vue instance. If isActive is true, the class attribute of the div element will contain the "active" class name, otherwise it will not contain the class name.

In addition to using object literals to set the class name, you can also use computed properties to return a class name string, for example:

<div v-bind:class="classObject"></div>

data: {
  isActive: true
},
computed: {
  classObject: function () {
    return {
      active: this.isActive,
      'text-danger': !this.isActive
    }
  }
}

In the above example, classObject is a computed property, It returns an object literal based on the value of the isActive property. The object contains two properties: active and text-danger. If isActive is true, classObject returns { active: true, 'text-danger': false }, and the class attribute of the div element will contain the "active" class name. Otherwise, it returns { active: false, 'text-danger': true }, the class attribute of the div element will contain the "text-danger" class name.

In addition to dynamically binding class names, you can also use the v-bind:style directive to dynamically bind inline styles. v-bind:style can bind the data attribute of a Vue instance to the style attribute of a DOM element. For example, you can use the v-bind:style directive to dynamically bind a background color. The specific usage is as follows:

<div v-bind:style="{ backgroundColor: color }"></div>

In the above example, color is a property of a Vue instance. If you set color to "red", the background color of the div element will be red.

In addition to using object literals to set inline styles, you can also use computed properties to return an object literal containing multiple style properties, for example:

<div v-bind:style="styleObject"></div>

data: {
  textColor: 'red',
  fontSize: 16
},
computed: {
  styleObject: function () {
    return {
      color: this.textColor,
      fontSize: this.fontSize + 'px'
    }
  }
}

In the above example, styleObject Is a computed property that returns an object literal based on the values ​​of the textColor and fontSize properties. The object contains two style properties: color and fontSize. If textColor is "red" and fontSize is 16, then styleObject returns { color: 'red', fontSize: '16px' }, and the style attribute of the div element will contain these two style attributes.

To sum up, Vue provides two instructions, v-bind:class and v-bind:style, which can dynamically change CSS styles very conveniently. These directives can dynamically set class names and inline styles based on the properties and computed properties of the Vue instance, allowing web applications to have better interaction and user experience.

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