兼容检测取消flat flatMap

public/web/syntax-detection.js

@@ -112,8 +112,8 @@ function checkSyntax() {
             'keys',
             'values',
             'entries',
-            'flat',
-            'flatMap',
+            //'flat', // es2019
+            //'flatMap',
             'includes'
         ];
         var arrayStaticFuncs = [