vue 官方组件功能测试， 有下划线，老是报错呢

 1 <template>
 2     <div>
 3         <!-- 9 drawer 抽屉  -->
 4         <el-radio-group v-model="direction">
 5   <el-radio label="ltr">从左往右开</el-radio>
 6   <el-radio label="rtl">从右往左开</el-radio>
 7   <el-radio label="ttb">从上往下开</el-radio>
 8   <el-radio label="btt">从下往上开</el-radio>
 9 </el-radio-group>
10 
11 <el-button @click="drawer = true" type="primary" style="margin-left: 16px;">
12   点我打开
13 </el-button>
14 
15 <el-drawer
16   title="我是标题"
17   :visible.sync="drawer"
18   :direction="direction"
19   :before-close="handleClose">
20   <span>我来啦!</span>
21 </el-drawer>
22 <!-- 9 -->
23     </div>
24 </template>
25 
26 <script>
27 export default {
28     data() {
29       return {
30         drawer: false,
31         direction: 'rtl',
32       };
33     },
34     methods: {
35       handleClose(done) {
36         this.$confirm('确认关闭？')
37           .then(_ => { // 下划线老是报错呢？  
38             done();
39           })
40           .catch(_ => {});
41       }
42     }
43   };
44 </script>

标签：vue,下划线,老是,功能测试,done,报错,从左往右
来源： https://www.cnblogs.com/zhuiqiuzhuoyueyouminxing/p/15037203.html