npm install -g @vue/cli

vue create vue-session-example

cd vue-session-example
npm run serve

<template>
  <div>
    <h1>會(huì)話表單</h1>
    <form @submit.prevent="handleSubmit">
      <div>
        <label for="username">用戶名:</label>
        <input
          type="text"
          id="username"
          v-model="username"
          @input="saveToSessionStorage"
        />
      </div>
      <div>
        <label for="email">郵箱:</label>
        <input
          type="email"
          id="email"
          v-model="email"
          @input="saveToSessionStorage"
        />
      </div>
      <button type="submit">提交</button>
    </form>
  </div>
</template>

<script>
export default {
  name: "SessionForm",
  data() {
    return {
      username: "",
      email: "",
    };
  },
  methods: {
    saveToSessionStorage() {
      sessionStorage.setItem("username", this.username);
      sessionStorage.setItem("email", this.email);
    },
    loadFromSessionStorage() {
      const storedUsername = sessionStorage.getItem("username");
      const storedEmail = sessionStorage.getItem("email");

      if (storedUsername) {
        this.username = storedUsername;
      }
      if (storedEmail) {
        this.email = storedEmail;
      }
    },
    handleSubmit() {
      alert(`提交成功: 用戶名 - ${this.username}, 郵箱 - ${this.email}`);
    },
  },
  mounted() {
    this.loadFromSessionStorage();
  },
};
</script>

<style scoped>
form {
  display: flex;
  flex-direction: column;
  max-width: 300px;
  margin: auto;
}

div {
  margin-bottom: 10px;
}

button {
  margin-top: 10px;
}
</style>

<template>
  <div id="app">
    <SessionForm />
  </div>
</template>

<script>
import SessionForm from './components/SessionForm.vue';

export default {
  name: 'App',
  components: {
    SessionForm
  }
};
</script>

<style>
#app {
  font-family: Avenir, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  margin-top: 60px;
}
</style>