element输入框文本超出悬浮提示

<el-tooltip :content="info" placement="top" :disabled="isshowtip">
  <el-input style="width:50px" v-model="info" @mouseover.native="inputOnMouseOver($event)"></el-input>
</el-tooltip>

inputOnMouseOver(event){
      const target=event.target
      if(target.offsetWidth<target.scrollWidth){
        this.isshowtip=false
      }else{
        this.isshowtip=true
      }
    }