如何封装一个vue3组件，以Toast弹框为例

Bertha 。 2022-11-12 01:40 504阅读 0赞

1、建一个components文件夹，里面建一个Toast.vue文件

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<template>
      <div class="toast">{
       {message}}</div>
    </template>
    
    <script>
    import { reactive } from 'vue'
    export default {
      props: ['message']
    }
    export const useToastEffect = () => {
      const toastData = reactive({
        showToast: false,
        toastMessage: ''
      })
      const showToast = (message) => {
        toastData.showToast = true
        toastData.toastMessage = message
        setTimeout(() => {
          toastData.showToast = false
          toastData.toastMessage = ''
        }, 2000)
      }
      return { toastData, showToast }
    }
    </script>
    
    <style lang="scss" scoped>
    .toast {
      position: fixed;
      left: 50%;
      top: 50%;
      transform: translate(-50%, -50%);
      padding: .1rem;
      background: rgba(0, 0, 0, .35);
      border-radius: .05rem;
      color: #FFF;
    }
    </style>

调用Toast组件

<template>
      <div class="wrapper">
        <img class="wrapper__img" src="http://www.dell-lee.com/imgs/vue3/user.png"/>
        <div class="wrapper__input">
          <input
            class="wrapper__input__content"
            placeholder="用户名"
            v-model="data.username"
          />
        </div>
        <div class="wrapper__input">
          <input
            type="password"
            class="wrapper__input__content"
            placeholder="请输入密码"
            v-model="data.password"
          />
        </div>
        <div class="wrapper__login-button" @click="handleLogin">登陆</div>
        <div class="wrapper__login-link" @click="handleRegisterClick">立即注册</div>
        <Toast v-if="toastData.showToast" :message="toastData.toastMessage" /> 
      </div>
    </template>
    
    <script>
    import { reactive } from 'vue'
    import { useRouter } from 'vue-router'
    import { post } from '../../utils/request'
    import Toast, { useToastEffect } from '../../components/Toast' // 1、在需要的页面引用
    
    export default {
      name: 'Login',
      components: { Toast },
      setup () {
        const router = useRouter()
        const data = reactive({ username: '', password: '' })
        const { toastData, showToast } = useToastEffect() // 3、
        const handleLogin = async () => {
          try {
            const result = await post('/api/user/login', {
              username: data.username,
              password: data.password
            })
            if (result?.errno === 0) {
              localStorage.isLogin = true
              router.push({ name: 'Home' })
            } else {
              showToast('登录失败') // 4、调用showToast组件
            }
          } catch (e) {
            showToast('请求失败') // // 5、调用showToast组件
          }
        }
        const handleRegisterClick = () => {
          router.push({ name: 'Register' })
        }
        return { handleLogin, handleRegisterClick, data, toastData } // 6、返回toastData
      }
    }
    </script>
    
    <style lang="scss" scoped>
    @import '../../style/viriables.scss';
    .wrapper {
      position: absolute;
      top: 50%;
      left: 0;
      right: 0;
      transform: translateY(-50%);
      &__img {
        display: block;
        margin: 0 auto .4rem auto;
        width: .66rem;
        height: .66rem;
      }
      &__input {
        height: .48rem;
        margin: 0 .4rem .16rem .4rem;
        padding: 0 .16rem;
        background: #F9F9F9;
        border: 1px solid rgba(0,0,0,0.10);
        border-radius: 6px;
        border-radius: 6px;
        &__content {
          line-height: .48rem;
          border: none;
          outline: none;
          width: 100%;
          background: none;
          font-size: .16rem;
          color: $content-notice-fontcolor;
          &::placeholder {
            color: $content-notice-fontcolor;
          }
        }
      }
      &__login-button {
        margin: .32rem .4rem .16rem .4rem;
        line-height: .48rem;
        background: #0091FF;
        box-shadow: 0 .04rem .08rem 0 rgba(0,145,255,0.32);
        border-radius: .04rem;
        border-radius: .04rem;
        color: #fff;
        font-size: .16rem;
        text-align: center;
      }
      &__login-link {
        text-align: center;
        font-size: .14rem;
        color: $content-notice-fontcolor;
      }
    }
    </style>

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