fix(@gms/gms-plugin-billexpand): 按钮组悬浮位置错误

develop/@gms/gms-plugin-billexpand/src/control/buttonGrouop.vue

 <template>
-  <div class="btngroup-container" :style="btnContainerStyle">
+  <div ref="btnGroup" class="btngroup-container" :style="btnContainerStyle">
     <ButtonGroup class="button-group">
       <div v-for="(item, index) in btnGroup" :key="index">
         <gms-button :define="item.buttonDefine" :context="context" :billStateDisable="item.billStateDisable"></gms-button>
@@ -35,7 +35,7 @@ export default {
   mounted() {
     // 判断是否在typesBill组件中
     const location = this.define.layout.adsorption === 'bottom' ? 'bottom' : 'top'
-    if (document.querySelector('.initHeight')) {
+    if (this.checkParent()) {
       if (location === 'top') {
         this.btnContainerStyle = {
           position: 'fixed',
@@ -55,6 +55,16 @@ export default {
     }
   },
   methods: {
+    checkParent() {
+      let curNode = this.$refs.btnGroup
+      while (curNode) {
+        if (!curNode.nodeName) break
+        if (curNode.nodeName.toLowerCase() == 'body') break
+        if (curNode.classList.contains('initHeight')) return true
+        curNode = curNode.parentNode
+      }
+      return false
+    },
     getBtnGroup() {
       const keys = this.define.config ? this.define.config.btnConfig : []
       this.btnGroup = keys.map((item) => {