复制整块，计算相关

app/base/base_bills_service.js

@@ -522,7 +522,7 @@ class BaseBillsSerivce extends TreeService {
     _calcExpr(data, field, expr, defaultValue, precision) {
         if (expr) {
             try {
-                data[field] = this.ctx.helper.round(math(expr), precision.value);
+                data[field] = this.ctx.helper.round(math.eval(expr), precision.value);
             } catch (err) {
             }
         } else {