为什么钢丝拉断了会弹回伤人,而绳子拉断了只会落回地面呢?

简单缓动，长形：

var dx:Number = targetX - sprite.x;

var dy:Number = targetY - sprite.y;

vx = dx * easing;

vy = dy * easing;

sprite.x += vx;

sprite.y += vy;

简单缓动，中形：

vx = (targetX - sprite.x) * easing;

vy = (targetY - sprite.y) * easing;

sprite.x += vx;

sprite.y += vy;

简单缓动，短形：

sprite.x += (targetX - sprite.x) * easing;

sprite.y += (targetY - sprite.y) * easing;

简单弹性，长形：

var ax:Number = (targetX - sprite.x) * spring;

var ay:Number = (targetY - sprite.y) * spring;

vx += ax; vy += ay; vx *= friction; vy *= friction;

sprite.x += vx;

sprite.y += vy;

简单弹性，中形：

vx += (targetX - sprite.x) * spring;

vy += (targetY - sprite.y) * spring;

vx *= friction;

vy *= friction;

sprite.x += vx;

sprite.y += vy;