SOURCE

var Main = {
  data() {
    return {
      text: '',
      textarea: ''
    }
  }
}
var Ctor = Vue.extend(Main)
new Ctor().$mount('#app')

<script src="//unpkg.com/vue/dist/vue.js"></script>
<script src="//unpkg.com/element-ui@2.13.0/lib/index.js"></script>
<div id="app">
<div style="margin: 20px 0;"></div>
<el-input
  type="textarea"
  placeholder="请输入内容"
  v-model="textarea"
  maxlength="300000"
  show-word-limit
>
</el-input>
</div>

@import url("//unpkg.com/element-ui@2.13.0/lib/theme-chalk/index.css");