完善类与接口章节的 distanceToOrigin 的实现

xcatliu · xcatliu · commit 21849cb6a16a · 2020-03-04T16:36:33.000+08:00
diff --git a/advanced/class-and-interfaces.md b/advanced/class-and-interfaces.md
@@ -201,7 +201,7 @@ class Point {
     static origin = new Point(0, 0);
     /** 静态方法，计算与原点距离 */
     static distanceToOrigin(p: Point) {
-        return 
+        return Math.sqrt(p.x * p.x + p.y * p.y);
     }
     /** 实例属性，x 轴的值 */
     x: number;

Original file line number	Diff line number	Diff line change
`@@ -201,7 +201,7 @@ class Point {`
`201`	`201`	`static origin = new Point(0, 0);`
`202`	`202`	`/** 静态方法，计算与原点距离 */`
`203`	`203`	`static distanceToOrigin(p: Point) {`
`204`		`- return`
	`204`	`+ return Math.sqrt(p.x * p.x + p.y * p.y);`
`205`	`205`	`}`
`206`	`206`	`/** 实例属性，x 轴的值 */`
`207`	`207`	`x: number;`