使此向量的大小为 1。
归一化后，向量保持相同的方向，但其长度为 1.0。
请注意，此函数将更改当前向量。如果您想保持当前向量不变，请使用normalized变量。
如果此向量太小而无法归一化，它将设置为零。
其他资源：normalized变量。
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