Vue实现动态显示textarea剩余字数监控

<el-input type="textarea" v-model="form.suggest" :maxlength="1000" @input="suggestRemnant"></el-input>
<span style="float:right;color:#999;">{{remarksRemnant}}/1000</span>

js代码：

suggestInput() {
  const txtVal = this.form.suggest
  this.suggestRemnant = 1000 - txtVal
}