Vue：Invalid prop: type check failed for prop "clearable". Expected Boolean, got St

输入框为了能清除内容加了clearable属性，设置clearable=true或者clearable="true"，出现以下提示错误：

Invalid prop: type check failed for prop "clearable". Expected Boolean, got String with value "true"

解决办法是，设置clearable时不用加true或者"true"，如下所示：

<el-input
  placeholder="请输入内容"
  v-model="input"
  clearable>
</el-input>

出现以下错误：

Property or method "attr" is not defined on the instance but referenced during render. Make sure that this property is reactive

表示attr属性或方法没有定义，在data或methods中定义即可。