鼠标悬停或悬浮在Vue.js中的应用

这里有一个运行正常的JSFiddle：http://jsfiddle.net/1cekfnqw/176/

<p v-on:mouseover="mouseOver" v-bind:class="{on: active, 'off': !active}">Hover over me!</p>

<div
    @mouseover="isMouseover = true"
    @mouseleave="isMouseover = false"
/>

vue-mouseover 提供了一个 v-mouseover 指令，当光标进入或离开指令所附加的 HTML 元素时，它会自动更新指定的数据上下文属性。

在下面的示例中，默认情况下，isMouseover 属性将在光标悬停在 HTML 元素上时为 true，否则为 false：

<div v-mouseover="isMouseover" />

默认情况下，当v-mouseover附加到div元素时，isMouseover将最初分配，因此它在第一个mouseenter/mouseleave事件之前不会保持未分配状态。

您可以通过v-mouseover-value指令指定自定义值：

<div
    v-mouseover="isMouseover"
    v-mouseover-value="customMouseenterValue"/>

或者

<div
    v-mouseover="isMouseover"
    v-mouseover-value="{
        mouseenter: customMouseenterValue,
        mouseleave: customMouseleaveValue
    }"
/>

你也可以使用VueUse组合函数。

这是用于鼠标悬停的。

<script setup>
import { useElementHover } from '@vueuse/core'

const myHoverableElement = ref()
const isHovered = useElementHover(myHoverableElement)
</script>

<template>
  <button ref="myHoverableElement">
    {{ isHovered }}
  </button>
</template>

这个是为鼠标悬停而设的。

import { useMouse } from '@vueuse/core'

const { x, y, sourceType } = useMouse()

甚至可以在特定元素中实现。

简而言之：为您的Vue2/Vue3应用程序提供了相当多的有用组件！

这对我在nuxt上有用

<template>
  <span
    v-if="item"
    class="primary-navigation-list-dropdown"
    @mouseover="isTouchscreenDevice ? null : openDropdownMenu()"
    @mouseleave="isTouchscreenDevice ? null : closeDropdownMenu()"
  >
    <nuxt-link
      to="#"
      @click.prevent.native="openDropdownMenu"
      v-click-outside="closeDropdownMenu"
      :title="item.title"
      :class="[
        item.cssClasses,
        { show: isDropdownMenuVisible }
      ]"
      :id="`navbarDropdownMenuLink-${item.id}`"
      :aria-expanded="[isDropdownMenuVisible ? true : false]"
      class="
        primary-navigation-list-dropdown__toggle
        nav-link
        dropdown-toggle"
      aria-current="page"
      role="button"
      data-toggle="dropdown"
    >
      {{ item.label }}
    </nuxt-link>
    <ul
      :class="{ show: isDropdownMenuVisible }"
      :aria-labelledby="`navbarDropdownMenuLink-${item.id}`"
      class="
        primary-navigation-list-dropdown__menu
        dropdown-menu-list
        dropdown-menu"
    >
      <li
        v-for="item in item.children" :key="item.id"
        class="dropdown-menu-list__item"
      >
        <NavLink
          :attributes="item"
          class="dropdown-menu-list__link dropdown-item"
        />
      </li>
    </ul>
  </span>
</template>

<script>
import NavLink from '@/components/Navigation/NavLink';

export default {
  name: "DropdownMenu",
  props: {
    item: {
      type: Object,
      required: true,
    },
  },
  data() {
    return {
      isDropdownMenuVisible: false,
      isTouchscreenDevice: false
    };
  },
  mounted() {
    this.detectTouchscreenDevice();
  },
  methods: {
    openDropdownMenu() {
      if (this.isTouchscreenDevice) {
        this.isDropdownMenuVisible = !this.isDropdownMenuVisible;
      } else {
        this.isDropdownMenuVisible = true;
      }
    },

    closeDropdownMenu() {
      if (this.isTouchscreenDevice) {
        this.isDropdownMenuVisible = false;
      } else {
        this.isDropdownMenuVisible = false;
      }
    },

    detectTouchscreenDevice() {
      if (window.PointerEvent && ('maxTouchPoints' in navigator)) {
        if (navigator.maxTouchPoints > 0) {
          this.isTouchscreenDevice = true;
        }
      } else {
        if (window.matchMedia && window.matchMedia("(any-pointer:coarse)").matches) {
          this.isTouchscreenDevice = true;
        } else if (window.TouchEvent || ('ontouchstart' in window)) {
          this.isTouchscreenDevice = true;
        }
      }
      return this.isTouchscreenDevice;
    }
  },
  components: {
    NavLink
  }
};
</script>

<style scoped lang="scss">
.primary-navigation-list-dropdown {
  &__toggle {
    color: $white;

    &:hover {
      color: $blue;
    }
  }

  &__menu {
    margin-top: 0;
  }

  &__dropdown {

  }
}

.dropdown-menu-list {
  &__item {

  }

  &__link {
    &.active,
    &.nuxt-link-exact-active {
      border-bottom: 1px solid $blue;
    }
  }
}
</style>

这里是一个非常简单的鼠标悬停和移出的示例：

<div id="app">
   <div :style = "styleobj" @mouseover = "changebgcolor" @mouseout = "originalcolor"> 
   </div>
</div>

new Vue({
  el:"#app",
  data:{
     styleobj : {
       width:"100px",
       height:"100px",
       backgroundColor:"red"
     }
  },
  methods:{
    changebgcolor : function() {
      this.styleobj.backgroundColor = "green";
    },
    originalcolor : function() {
      this.styleobj.backgroundColor = "red";
    }
  }
});