vue mouse move into remove event

Vue.js is a very convenient and easy-to-use front-end framework. It is based on the MVVM model, and it is very easy to achieve dynamic effects on the page during the development process. In Vue.js, mouse events are very common, and mouse in and out events (mouseover and mouseout) are also widely used. Let's learn how to use mouse move in and remove events in Vue.js.

1. Mouse enter event

When the user's mouse moves to an element, Vue.js will trigger the mouseenter event. In Vue.js, we can use the v-on instruction to handle the mouse move-in event, as shown below:

<template>
  <div>
    <h3 v-on:mouseenter="handleMouseEnter">鼠标移入我了</h3>
  </div>
</template>
<script>
export default {
  methods: {
    handleMouseEnter () {
      console.log('鼠标移入');
    }
  }
}
</script>

In the above code, we use the v-on instruction to bind the mouse move-in event. The event The processing function is handleMouseEnter. When the user moves the mouse to the element, the handleMouseEnter function is triggered. In this function, we can implement arbitrary business logic.

Specifically, in the above code, we simply output the sentence "mouse in" on the console. In actual applications, we can perform different operations according to business needs, such as displaying a certain element, changing styles, etc.

2. Mouse out event

Corresponding to the mouse move in event is the mouse move out event. In Vue.js, we can bind the mouseleave event through the v-on instruction, as shown below:

<template>
  <div>
    <h3 v-on:mouseleave="handleMouseLeave">鼠标移出我了</h3>
  </div>
</template>
<script>
export default {
  methods: {
    handleMouseLeave () {
      console.log('鼠标移出');
    }
  }
}
</script>

In the above code, we bind the mouseleave event through the v-on instruction, and the event processing function for handleMouseLeave. When the user moves the mouse away from the element, the handleMouseLeave function is triggered. In this function, we can also perform any operations to meet business needs.

It should be noted that the mouseenter and mouseleave events are slightly different from the mouseover and mouseout events. Specifically, the mouseenter and mouseleave events will only be triggered once when the mouse crosses the boundary of the element, while the mouseover and mouseout events may be triggered multiple times when the mouse enters and exits the child elements of the element. Therefore in Vue.js, we usually use mouseenter and mouseleave events instead of mouseover and mouseout events.

3. Comprehensive application of mouse move-in and mouse-out events

In addition to using mouse move-in events and mouse move-out events separately, these two events can also be comprehensively applied in Vue.js to achieve some advanced effects. For example, we can use the v-if instruction to display an element when the mouse moves in and hide the element when the mouse moves out, as shown below:

<template>
  <div>
    <h3 v-on:mouseenter="handleMouseEnter"
        v-on:mouseleave="handleMouseLeave">鼠标移入移出我</h3>
    <div v-if="isShow">我是要显示的内容</div>
  </div>
</template>
<script>
export default {
  data () {
    return {
      isShow: false
    }
  },
  methods: {
    handleMouseEnter () {
      this.isShow = true;
    },
    handleMouseLeave () {
      this.isShow = false;
    }
  }
}
</script>

In the above code, we use v- if directive to dynamically control the display and hiding of elements. When the user moves the mouse into the element, we set isShow to true, thereby showing the element; when the user moves the mouse out of the element, we set isShow to false, thus hiding the element. In this way, we can achieve more complex mouse movement in and out effects.

In short, mouse move in and remove events are very commonly used in Vue.js and need to be used frequently in actual development. Through the explanation of this article, I believe that everyone has a deeper understanding of mouse move in and out events in Vue.js, and can use them more flexibly in actual development.

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