Update chapter1.md

skywingfs · web-flow · commit d5ba38df52ff · 2018-04-24T14:57:29.000+08:00
diff --git a/files/chapter1.md b/files/chapter1.md
@@ -98,7 +98,7 @@ class OperationFactory
 // 客户端代码
 $operation = OperationFactory::createOperation('+');
 $operation->setA(1);
-$operation->setA(2);
+$operation->seB(2);
 echo $operation->getResult()."\n";
 ```
 
@@ -112,4 +112,4 @@ echo $operation->getResult()."\n";
 
 > 高内聚，低耦合
 
-下一章：[第二章 商场促销 －－－ 策略模式](https://github.com/flyingalex/design-patterns-by-php/blob/master/files/chapter2.md)
+下一章：[第二章 商场促销 －－－ 策略模式](https://github.com/flyingalex/design-patterns-by-php/blob/master/files/chapter2.md)
