这段代码的妙处在于：无论鼠标在屏幕哪个位置， v.normalize () 都先把向量压成长度为 1 的纯方向，随后 .mult (50) 把它拉长到固定长度 50。因此线段永远"指向鼠标且长度恒定"，不会因为鼠标距离画布中心忽远忽近而忽长忽短。
There are two ways to redeem promo codes in Escape From Tarkov. The first is to boot up the game launcher, then click on the drop-down arrow beneath your username in the top right-hand corner. Then ...
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