获取鼠标的移动方向

var previousX = 0;
var previousY = 0;

document.onmousemove = function(event) {
  var currentX = event.clientX;
  var currentY = event.clientY;
  
  var directionX = currentX - previousX;
  var directionY = currentY - previousY;
  
  // 判断鼠标移动方向
  if (directionX > 0) {
    console.log("鼠标向右移动");
  } else if (directionX < 0) {
    console.log("鼠标向左移动");
  }
  
  if (directionY > 0) {
    console.log("鼠标向下移动");
  } else if (directionY < 0) {
    console.log("鼠标向上移动");
  }
  
  // 更新previousX和previousY的值
  previousX = currentX;
  previousY = currentY;
};