➡️ 向量计算器Vector Calculator
二维/三维向量的加减、点积、叉积、模长和夹角计算，输入如 1,2,3。2D/3D vectors: sum, difference, dot product, cross product, magnitude and angle. Input like 1,2,3.
使用说明与常见问题How-to & FAQ
「向量计算器」是什么？What is the Vector Calculator?
二维/三维向量的加减、点积、叉积、模长和夹角计算，输入如 1,2,3。2D/3D vectors: sum, difference, dot product, cross product, magnitude and angle. Input like 1,2,3.
如何使用「向量计算器」？How do I use the Vector Calculator?
在「向量计算器」中，填写「向量 A」、「向量 B」等参数，结果会随输入实时计算并显示在下方。In the Vector Calculator: Fill in "Vector A", "Vector B"; results are recalculated instantly as you type.
计算精度如何？How precise are the results?
「向量计算器」使用 JavaScript 双精度浮点数（约 15–16 位有效数字）；极大或极小的数值可能存在精度误差。The Vector Calculator uses double-precision floating point (about 15–16 significant digits); very large or very small values may lose precision.
「向量计算器」免费吗？需要注册吗？Is the Vector Calculator free? Do I need an account?
「向量计算器」完全免费，无需注册或安装，打开网页即可使用，手机和电脑都能用；输入的内容只在你的浏览器本地处理。The Vector Calculator is completely free with no sign-up or install and works on phones and desktops; what you enter is processed only in your browser.