获得屏幕的中心

// 获取屏幕的中心坐标
function getScreenCenter() {
  var screenWidth = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth;
  var screenHeight = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
  
  var centerX = screenWidth / 2;
  var centerY = screenHeight / 2;
  
  return { x: centerX, y: centerY };
}

// 使用示例
var screenCenter = getScreenCenter();
console.log("屏幕中心坐标：", screenCenter.x, screenCenter.y);