修复自定义指令lemon-contextmenu报错的问题

examples/lemon-message-voice.vue

@@ -0,0 +1,30 @@
+<script>
+export default {
+  name: "lemonMessageVoice",
+  inheritAttrs: false,
+  inject: ["IMUI"],
+  render() {
+    return (
+      <lemon-message-basic
+        class="lemon-message-voice"
+        props={{ ...this.$attrs }}
+        scopedSlots={{
+          content: props => {
+            return <span>{props.content}&nbsp;🔈</span>;
+          }
+        }}
+      />
+    );
+  }
+};
+</script>
+<style lang="stylus">
+.lemon-message.lemon-message-voice
+  user-select none
+  .lemon-message__content
+    border 2px solid #000
+    font-size 12px
+    cursor pointer
+    &::before
+      display none
+</style>