fix equal indicator

src/features/projectCompareManagement/ProjectCompareManagement.vue

@@ -127,6 +127,8 @@ function cellRender(prop: keyof SASPaper) {
           : data[index - 2];
       if (op[prop] > record[prop]) {
         getClass = "arrow-down-indicator";
+      } else if (op[prop] === record[prop]) {
+        getClass = "arrow-equal-indicator";
       } else {
         getClass = "arrow-up-indicator";
       }
@@ -301,4 +303,9 @@ async function goCompareDetail(courseCode: string) {
   color: red;
   font-weight: 700;
 }
+.arrow-equal-indicator::before {
+  content: "↔";
+  color: black;
+  font-weight: 700;
+}
 </style>