docs: edit class-extends

ruanyf · ruanyf · commit 19e1974afe27 · 2018-06-21T16:40:25.000+08:00
diff --git a/docs/class-extends.md b/docs/class-extends.md
@@ -713,7 +713,7 @@ function mix(...mixins) {
   class Mix {}
 
   for (let mixin of mixins) {
-    copyProperties(Mix, mixin); // 拷贝实例属性
+    copyProperties(Mix.prototype, new mixin()); // 拷贝实例属性
     copyProperties(Mix.prototype, mixin.prototype); // 拷贝原型属性
   }
 

Original file line number	Diff line number	Diff line change
`@@ -713,7 +713,7 @@ function mix(...mixins) {`
`713`	`713`	`class Mix {}`
`714`	`714`
`715`	`715`	`for (let mixin of mixins) {`
`716`		`- copyProperties(Mix, mixin); // 拷贝实例属性`
	`716`	`+ copyProperties(Mix.prototype, new mixin()); // 拷贝实例属性`
`717`	`717`	`copyProperties(Mix.prototype, mixin.prototype); // 拷贝原型属性`
`718`	`718`	`}`
`719`	`719`