功能:表达值求值支持返回字符串

src/Common/eval.ts

@@ -77,7 +77,10 @@ export function eval2(expr: string, params?: {}, defaultParam?: string): number
     if (typeof result === "function")
         return result();
 
-    return Number(result);//防止bigint乱入
+    if (typeof result === "bigint")
+        return Number(result);//防止bigint乱入
+
+    return result;
 }
 
 export function safeEval(expr: string, params?: {}, defaultParam?: string): number