fix reduce_vars on AST_Array.length (#2404)

2017-10-27 02:33:37 +08:00
parent ee082ace1b
commit 9b0f86f5a1
2 changed files with 59 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -572,7 +572,9 @@ merge(Compressor.prototype, {
            if (key instanceof AST_Node) return null;
            var value;
            if (obj instanceof AST_Array) {
-                value = obj.elements[key];
+                var elements = obj.elements;
+                if (key == "length") return make_node_from_constant(elements.length, obj);
+                if (typeof key == "number" && key in elements) value = elements[key];
            } else if (obj instanceof AST_Object) {
                var props = obj.properties;
                for (var i = props.length; --i >= 0;) {