可以看到小球掉落屏幕 有半個(gè)不在地平線上，問(wèn)題主要是
更新小球狀態(tài)是需要 減去2倍數(shù)的半徑
for?(let?i?=?0;?i?<?Ball.length;?i++)?{
????Ball[i].x?+=?Ball[i].vx
????Ball[i].y?+=?Ball[i].vy
????Ball[i].vy?+=?Ball[i].g
????if?(Ball[i].y?>?canvasHeight?-?2*RADIUS)?{
????????Ball[i].y?=?canvasHeight?-?2*RADIUS
????????Ball[i].vy?=?-Ball[i].vy?*?0.75
????}
}
2020-05-29
更新小球狀態(tài)是需要 減去2倍數(shù)的半徑 ==>??這是碰撞到地板,所以只要碰到地板即可.減去一個(gè)半徑
2019-11-04
是與畫布底部間隔一個(gè)radius吧，改成
???if?(Ball[i].y?>?canvasHeight?-?RADIUS)?{ ????????Ball[i].y?=?canvasHeight?-?RADIUS ????????Ball[i].vy?=?-Ball[i].vy?*?0.75 ????}不是有源碼么。感覺(jué)是假提問(wèn)