<div id="app" class="app">
  <textarea v-model="log"></textarea>
  <input @keyup.enter="add" type="text" v-model="input">
  <button @click="log=''">Clear Log</button>
</div>

html, body {
  display: grid;
  justify-content: center;
  align-content: center;
  
  height: 100%;
  font-family: sans-serif;
  font-size: 1.1rem;
}

.app {
  display: grid;
}

textarea {
  padding: 5px;
  border: 1px solid #ccc;
  height: 150px;
  margin-bottom: 5px;
}

input {
  padding: 5px;
  border: 1px solid #ccc;
  margin-bottom: 5px;
}

const app = Vue.createApp({
  data: function () {
    return {
      log: '',
      input: ''
    }
  },
  mounted: function () {
    const log = localStorage.getItem('log')
    
    if (log) {
      console.log(log)
      this.log = log
    }
  },
  methods: {
    add: function () {
      this.log += "\n" + this.input
      this.input = ''
    }
  },
  watch: {
    log: function () {
      localStorage.setItem('log', this.log)
    }
  }
})

const vm = app.mount('#app')