Vue实现动态显示textarea剩余字数

Vue实现动态显示textarea剩余文字数量，具体内容如下

这里我们假设允许用户输入的最多数量为200个

html代码如下：

{{remnant}}/200
</pre>

<p>javascript代码如下：</p>

<pre class="brush:js;">
data(){
 return{
 remnant: 200
 }
}

methods:{
 descInput(){
 var txtVal = this.desc.length;
 this.remnant = 200 - txtVal;
 }
}

</pre>

<p>css代码在这里就不码出来了~</p>
<p>实现效果如下： <br />
</p>
<p style="text-align: center"></p>
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