Merge pull request #728 from iamybj/patch-1

这个方式更好

Author: astaxie

zh/04.2.md

@@ -86,12 +86,14 @@
 那么我们可以这样来验证
 
 	slice:=[]string{"apple","pear","banane"}
-
-	for _, v := range slice {
-		if v == r.Form.Get("fruit") {
+	
+	v := r.Form.Get("fruit")
+	for item in slice {
+		if item == v {
 			return true
 		}
 	}
+	
 	return false
 
 ## 单选按钮