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				@@ -315,15 +315,17 @@ export default defineComponent({ 
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				       // } 
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				       // 管乐迷曲谱详情页,需要下载A4尺寸的图片 
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				-      if (query.downPng === 'A4') { 
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				-        const imgList = getSvgPngToSize(state.osmd) 
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				-        console.log('A4', imgList) 
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				-        window.parent.postMessage({ 
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				-          api: 'musicStaffRender', 
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				-          loading: false, 
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				-          osmdImg: imgList 
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				-        }, '*'); 
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				-      } 
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				+      setTimeout(() => { 
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				+        if (query.downPng === 'A4' && state.partIndex != 999) { 
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				+          const imgList = getSvgPngToSize(state.osmd) 
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				+          console.log('A4', imgList) 
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				+          window.parent.postMessage({ 
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				+            api: 'musicStaffRender', 
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				+            loading: false, 
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				+            osmdImg: imgList 
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				+          }, '*'); 
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				+        } 
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				+      }, 100); 
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				       state.musicScoreBtnDirection = state.playBtnDirection; 
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				       state.musicRendered = true; 
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