diff --git a/README.md b/README.md
index bededc8..2fc0566 100644
--- a/README.md
+++ b/README.md
@@ -5,7 +5,7 @@ Map                          | Lua                         |               Javas
 `(define map)`               |`local map`                  |`var map`
 `(define a 0)`               |`local a=0`                  |`var a=0`
 `(set! x 1)`                 |`x=1`                        |`x=1`
-`(lambda (x) (return x))`    |`(function(x)return x end)`  |`(function(x){return x})`
+`(lambda (x) x)`             |`(function(x)return x end)`  |`(function(x){return x})`
 `(! [x 132] [y 343] [z 912])`|`{x=132, y=343, z=912}`      |`{x:132, y:343, z:912}`
 `(ref t "x")`                |`t["x"]`                     |`t["x"]`
 `(@ t x)`                    |`t.x`                        |`t.x`
@@ -14,3 +14,12 @@ Map                          | Lua                         |               Javas
 `(vector-ref v 1)`           |`v[1+1]`                     |`v[1]`
 `(set! (vector-ref v 1) 1)`  |`v[1+1]=1`                   |`v[1]=1`
 `(apply f t)`                |                             |
+
+与Scheme的区别
+============
++ 无char,pair,symbol,`vector-set!`,`vector->string`,`call/cc`等
++ 无`define-record-type`
++ `<` `>` `=` 等只能有2个参数
++ 所有primitive不是值
++ 没有宏
++ 数字只有float
diff --git a/js.rkt b/js.rkt
index 83b3fae..0bfe477 100644
--- a/js.rkt
+++ b/js.rkt
@@ -150,12 +150,14 @@
                                                   (EVAL `(begin ,@c) ig)
                                                   "}\n"
                                                   (f undefined)))))))))]
-    [`(number? ,x) (EVAL x (λ (xx) (++ "(typeof " xx "=='number')")))]
-    [`(boolean? ,x) (EVAL x (λ (xx) (++ "(typeof " xx "=='boolean')")))]
-    [`(procedure? ,x) (EVAL x (λ (xx) (++ "(typeof " xx "=='function')")))]
-    [`(string? ,x) (EVAL x (λ (xx) (++ "(typeof " xx "=='string')")))]
-    [`(!/vectror? ,x) (EVAL x (λ (xx) (++ "(typeof " xx "=='object')")))]
-    [`(vector? ,x) (EVAL x (λ (xx) (++ "(" xx " instanceof Array")))]
+    [`(number? ,x) (EVAL x (λ (xx) (f (++ "(typeof " xx "=='number')"))))]
+    [`(boolean? ,x) (EVAL x (λ (xx) (f (++ "(typeof " xx "=='boolean')"))))]
+    [`(procedure? ,x) (EVAL x (λ (xx) (f (++ "(typeof " xx "=='function')"))))]
+    [`(string? ,x) (EVAL x (λ (xx) (f (++ "(typeof " xx "=='string')"))))]
+    [`(!/vectror? ,x) (EVAL x (λ (xx) (f (++ "(typeof " xx "=='object')"))))]
+    [`(vector? ,x) (EVAL x (λ (xx) (f (++ "(" xx " instanceof Array"))))]
+    [`(number->string ,x) (EVAL x (λ (xx) (f (++ xx".toString()"))))]
+    [`(string->number ,x) (EVAL x (λ (xx) (f (++ "parseFloat("xx")"))))]
     [`(host ,@c) (match c [`(,_ ... [js ,v] ,_ ...) (f v)])]
     [`(raise ,e) (EVAL e (λ (ee) (++ "throw "ee"\n")))]
     [`(with-exception-handler ,handler ,thunk)
diff --git a/lua.rkt b/lua.rkt
index d630a82..35312b9 100644
--- a/lua.rkt
+++ b/lua.rkt
@@ -141,6 +141,8 @@
     [`(vector? ,x)
      (EVAL x (λ (xx)
                (store! xx (λ (v) (f (++ "(" v "[1] or next(" v ")==nil)"))))))]
+    [`(number->string ,x) (EVAL x (λ (xx) (f (++ "tostring("xx")"))))]
+    [`(string->number ,x) (EVAL x (λ (xx) (f (++ "tonumber("xx")"))))]
     [`(host ,@c) (match c [`(,_ ... [lua ,v] ,_ ...) (f v)])]
     [`(raise ,e) (EVAL e (λ (ee)
                            (++ "E_="ee"\n"
@@ -154,7 +156,7 @@
          (λ (t)
            (let ([s (genvar!)] [x (genvar!)])
              (++ "local "s","x"=pcall("t")\n"
-                 "if "s"==false and string.sub("x",-6)==\"MapErr\" then\n"
+                 "if not "s" and string.sub("x",-6)==\"MapErr\" then\n"
                  x"="h"(E_)\n"
                  "end\n"
                  (f x)))))))]