变更概况，已变更计算问题

app/public/js/stage_change.js

@@ -36,7 +36,7 @@ class ChangeAnalysis {
         change.bills = change.detail.bills;
         for (const b of change.bills) {
             const aub = change.detail.addUsedBills.find(function (x) {
-                return x.id = b.id;
+                return x.id === b.id;
             });
             if (aub) {
                 b.used_qty = aub.used_qty;