修改时间bug

src/components/student/scoreDwTjTable.vue

@@ -107,7 +107,9 @@ export default {
         shortcuts: [{
           text: '本月',
           onClick(picker) {
-            picker.$emit('pick', [new Date(), new Date()]);
+            const end = new Date();
+            const start = new Date(end.getFullYear(), end.getMonth(), 1);
+            picker.$emit('pick', [start, end]);
           }
         }, {
           text: '今年至今',