bug fixes

src/pages/student/index.vue

@@ -314,6 +314,7 @@ export default {
           let val = item[key]
           if (key === 'gender') val = genderMap[val]
           if (key === 'is_student') val = val === 1 ? '有' : '无'
+          if (key === 'student_number') val = val + ''
           rowValArr.push(val)
         })
         excelList.push(rowValArr)