JavaScript:实现二维向量以及各种向量操作算法（附完整源码）

class Vector2 {
   
  constructor (x, y) {
   
    this.x = x
    this.y = y
  }

  /**
   * Check for exact vector equality.
   *
   * @param vector The vector to compare to.
   * @returns Whether they are exactly eq
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