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				@@ -94,13 +94,12 @@ export default { 
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				   }, 
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				   methods: { 
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				     queryBookList() { 
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				-      let data = { 
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				+      PageQueryBookList_SelectBookForCourse({ 
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				         name: this.search, 
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				         course_id: this.id, 
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				         page_capacity: this.page_capacity, 
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				         cur_page: this.cur_page 
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				-      }; 
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				-      PageQueryBookList_SelectBookForCourse(data).then(({ book_list, cur_page, total_count }) => { 
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				+      }).then(({ book_list, cur_page, total_count }) => { 
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				         this.cur_page = cur_page; 
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				         this.total_count = total_count; 
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				         this.book_list = book_list; 
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				@@ -112,14 +111,13 @@ export default { 
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				     }, 
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				     addOrRemoveBookToCourse(e, book_id) { 
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				       let classList = e.target.parentElement.parentElement.classList; 
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				-      let isSelected = classList.contains('selected'); 
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				       let data = { 
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				         course_id: this.id, 
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				         book_id 
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				       }; 
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				-      if (isSelected) { 
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				+      if (classList.contains('selected')) { 
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				         RemoveBookFromCourse(data).then(() => { 
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				           this.$message.success(this.$i18n.t('Key350')); 
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				           classList.remove('selected'); 
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