小球重疊問題
離開頁面后，再回來會發(fā)現(xiàn)有很多小球都疊在一起了
請叫我橙子蛋
2016-08-21
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2016-08-25
性能優(yōu)化function updateBalls(){
??? for( var i = 0 ; i < balls.length ; i ++ ){
??????? balls[i].x += balls[i].vx;
??????? balls[i].y += balls[i].vy;
??????? balls[i].vy += balls[i].g;
??????? if( balls[i].y >= WINDOW_HEIGHT-RADIUS ){
??????????? balls[i].y = WINDOW_HEIGHT-RADIUS;
??????????? balls[i].vy = - balls[i].vy*0.75;
??????? }
??? }
??? var cnt = 0
??? for( var i = 0 ; i < balls.length ; i ++ )
??????? if( balls[i].x + RADIUS > 0 && balls[i].x -RADIUS < WINDOW_WIDTH )
??????????? balls[cnt++] = balls[i]
??? while( balls.length > Math.min(300,cnt) ){
??????? balls.pop();
??? }
}