课程中心页面注册，uv-tabs引入

src/api/common.js

@@ -39,4 +39,27 @@ export const uploadFile = (file, data) => {
 			}  
 		});  
 	});
-};
+};
+
+
+// 对象存储预览 /traoss/tras3/show/{文件ID}
+export function previewFile(id,responseType = 'blob') {
+    const token = getToken();  
+    const header = {};  
+    if (token) 
+        header['summary'] = token
+	
+	return new Promise((resolve, reject) => {  
+		uni.request({  
+			url: `/traoss/tras3/show/${id}`,  
+			header,  
+			responseType,
+			success(result) {  
+				resolve(result.data)
+			},  
+			fail(error) {    
+				reject(new Error('Upload failed'));  
+			}  
+		});  
+	});
+}