el-checkbox多选框实现单选效果，选中一个选项则自动取消其他勾选

  <el-checkbox-group v-model="CheckResult">                
     <el-checkbox false-label="null"  true-label="选项1"
         >选项1</el-checkbox>
      <el-checkbox false-label="null" true-label="选项2"
         >选项2</el-checkbox>
       <el-checkbox false-label="null"  true-label="选项3"  >选项3</el-checkbox>
      </div>
 </el-checkbox-group>