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				@@ -677,10 +677,12 @@ export default { 
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				             this.$message.error('必须加入一个单机班或合奏班') 
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				             return; 
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				           } 
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				+          let snapClassIds; 
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				+          maskForm.snapClass.length > 0 ? snapClassIds = maskForm.snapClass.join(',') : snapClassIds = null 
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				           let params = { 
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				             signClassId: maskForm.signClass, 
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				             mixClassId: maskForm.mixClass, 
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				-            snapClassIds: maskForm.snapClass.join(','), 
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				+            snapClassIds, 
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				             highClassId: maskForm.highClass, 
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				             courseFee: maskForm.courseFee, 
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				             temporaryCourseFee: maskForm.temporaryCourseFee, 
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