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				@@ -235,12 +235,24 @@ 
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				           fixed="right" 
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				         > 
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				           <template slot-scope="scope"> 
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				-            <el-button 
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				+            <!-- <el-button 
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				               type="text" 
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				               @click="looker(scope.row)" 
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				               :disabled="(scope.row.isOpenMetronome ? !scope.row.url : !scope.row.metronomeUrl) || scope.row.clientType != 'SMART_PRACTICE'" 
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				               >预览</el-button 
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				-            > 
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				+            > --> 
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				+            <el-dropdown :disabled="(scope.row.isOpenMetronome ? !scope.row.url : !scope.row.metronomeUrl) || scope.row.clientType != 'SMART_PRACTICE'"> 
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				+                <span class="el-dropdown-link"> 
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				+                  预览<i class="el-icon-arrow-down el-icon--right"></i> 
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				+                </span> 
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				+                <el-dropdown-menu slot="dropdown"> 
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				+                  <el-dropdown-item> 
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				+                    <el-button type="text" @click="looker(scope.row, 1)" >原音自带节拍器</el-button></el-dropdown-item> 
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				+                  </el-dropdown-item> 
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				+                  <el-dropdown-item> 
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				+                    <el-button type="text" @click="looker(scope.row, 0)" >系统自带节拍器</el-button></el-dropdown-item> 
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				+                </el-dropdown-menu> 
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				+              </el-dropdown> 
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				             <el-button 
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				               type="text" 
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				               @click="player(scope.row)" 
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				@@ -336,11 +348,13 @@ export default { 
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				   }, 
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				   data() { 
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				     return { 
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				+      tabName: 'first', 
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				       type: "", 
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				       activeUrl: "", 
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				       songUseType, 
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				       lookVisible: false, 
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				       accompanyUrl: null, // 预览地址 
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				+      accompanyUrl2: null, // 预览地址 
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				       audioVisible: false, 
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				       tableList: [], 
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				       searchForm: { 
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				@@ -427,14 +441,16 @@ export default { 
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				       this.$refs.searchForm.resetFields(); 
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				       this.FetchList(); 
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				     }, 
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				-    looker(row) { 
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				+    looker(row, num) { 
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				       this.accompanyUrl = 
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				         vaildTeachingUrl() + 
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				         "/accompany?Authorization=" + 
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				         getToken() + 
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				-        "&platform=web#/detail/" + 
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				+        "&platform=web&isOpenMetronome="+ num +"#/detail/" + 
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				         row.id; 
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				       this.lookVisible = true; 
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				+ 
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				+ 
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				       // this.$nextTick(() => { 
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				       //   console.log(this.$refs.iframe) 
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				       //   let iframe = this.$refs.iframe 
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				@@ -506,6 +522,10 @@ export default { 
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				 } 
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				 </style> 
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				 <style lang="less" scoped> 
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				+/deep/.el-dropdown { 
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				+  margin-right: 10px; 
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				+  color: #14928A; 
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				+} 
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				 .remark { 
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				   display: inline; 
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				   overflow: hidden; 
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				@@ -516,7 +536,6 @@ export default { 
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				     padding: 0; 
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				   } 
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				 } 
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				- 
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				 .iframe_back { 
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				   width: 195px; 
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				   height: 45px; 
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