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                            ## css部分
```
//自適應textarea高度
.expandingArea{
  position:relative;
  textarea{
    position:absolute;
    top:0;
    left:0;
    height:100%;
  }
  pre{
    display:block;
    visibility:hidden;
    font-size: 16px;
    letter-spacing: .5px;
    padding: 8px 16px 8px 52px;
    line-height: 20px;
    word-break: break-all;
    white-space: normal;
    font-style: normal;
    font-family: -apple-system,SF UI Text,Arial,PingFang SC,Hiragino Sans GB,Microsoft YaHei,WenQuanYi Micro Hei,sans-serif;
    text-align: left;
    margin: 0;
    min-height: 36px;
  }
}
```
## vue部分
```
<div class="expandingArea ">
  <pre><span>{{x.answer}}</span><br></pre>
  <textarea type="text" v-model="x.answer" placeholder="輸入答案" rows="1"></textarea>
</div>  
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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