//内页banner
$(window).scroll(function() {
  var flag = "+";
  if ($(window).scrollTop() > 0) {
    var k2 = $(window).scrollTop() / 2;
    k2 < 0 ? flag = " -" : " +";
    $(".yx_Banner_N .yx_BN_Img").css({"background-position-y": "calc(50% " + flag + " " + Math.abs(k2) + "px)","filter":" blur(0)"});
  } else {
    $(".yx_Banner_N .yx_BN_Img").css({"background-position-y":"50%","filter":" blur(0)"});
  }
});