两个向量的点积。
返回 lhs
.
/rhs/。
对于标准化向量,如果它们指向完全相同的方向,Dot 返回 1;
如果它们指向完全相反的方向,返回 -1;
对于其他情况,返回介于 -1 与 1 之间的数字(例如,如果向量彼此垂直,则 Dot 返回 0)。
对于任意长度的向量,Dot 的返回值是相似的:
当向量之间的角度减小时,返回值变大。
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