Html5游戏开发开始前的一些数学基础

var vectorMagnitude = Math.sqrt(Math.pow(vector.x, 2) +
Math.pow(vector.y, 2));

var vectorMagnitude = Math.sqrt(Math.pow(vector.x, 2) +
Math.pow(vector.y, 2)),
unitVector = new Vector();
unitVector.x = vector.x / vectorMagnitude;
unitVector.y = vector.y / vectorMagnitude;

var vectorSum = new Vector();
vectorSum.x = vectorOne.x + vectorTwo.x;
vectorSum.y = vectorOne.y + vectorTwo.y;

var vectorSubtraction = new Vector();
vectorSubtraction.x = vectorOne.x - vectorTwo.x;
vectorSubtraction.y = vectorOne.y - vectorTwo.y;

var dotProduct = vectorOne.x * vectorTwo.x + vectorOne.y * vectorTwo.y;