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// 大屏自适应代码
function scaleView() {
  var screenWidth = 1920;
  var screenHeight = 1080;
  var wScale = window.innerWidth / screenWidth;
  var hScale = window.innerHeight / screenHeight;
  var trueTop = (window.innerHeight - screenHeight * wScale) / 2;
  var trueLeft = (window.innerWidth - screenWidth * hScale) / 2;
  if (wScale >= hScale) {
    $(".mainBg").css({
      transform: "scale(" + hScale + ")",
      top: 0,
      left: trueLeft,
    });
  } else {
    $(".mainBg").css({
      transform: "scale(" + wScale + ")",
      top: trueTop,
      left: 0,
    });
  }
}