Update README_CN.md

lizhuoyuan · web-flow · commit bfe7835b78b1 · 2020-09-22T20:42:45.000+08:00
diff --git a/README_CN.md b/README_CN.md
@@ -94,7 +94,7 @@ ScreenUtil.init(designSize: Size(750, 1334), allowFontScaling: true);
     ScreenUtil().scaleHeight // 实际高度的dp与设计稿px的比例
 
     0.2.wp  //屏幕宽度的0.2倍
-    0.5.hp  //屏幕宽度的50%
+    0.5.hp  //屏幕高度的50%
 ```
 
 
