c#扩展方法

dotween有一种写法

transform.DOMove

给Transform类扩展了方法

具体实现为

using System;
using UnityEngine;
public static Tweener DOMove (this Transform target, Vector3 endValue, float duration, bool snapping = false)
{
	return DOTween.To (() => target.get_position (), delegate (Vector3 x)
	{
		target.set_position (x);
	}, endValue, duration).SetOptions (snapping).SetTarget (target);
}

静态类，this关键字