Cannot read properties of undefined (reading 'responsive')

报错"Cannot read properties of undefined (reading 'responsive')"是因为在给$('.course-slider')添加slick轮播功能时，没有定义responsive属性。

要解决这个问题，你需要在添加slick轮播功能的代码中定义responsive属性。例如：

$('.course-slider').not('.slick-initialized').slick({
  infinite: true,
  slidesToShow: 6,
  centerMode: false,
  centerPadding: '10px',
  slidesToScroll: 1,
  autoplay: true,
  autoplaySpeed: 8000,
  draggable: false,
  speed: 1000,
  responsive: [
    {
      breakpoint: 1024,
      settings: {
        slidesToShow: 4,
        slidesToScroll: 1,
        infinite: true,
        dots: true
      }
    },
    {
      breakpoint: 800,
      settings: {
        slidesToShow: 4,
        slidesToScroll: 1
      }
    },
    {
      breakpoint: 600,
      settings: {
        slidesToShow: 2,
        slidesToScroll: 1
      }
    },
    {
      breakpoint: 480,
      settings: {
        slidesToShow: 2,
        slidesToScroll: 1
      }
    }
  ]
});

请确保在代码中包含上述的responsive属性，并相应地设置不同的屏幕尺寸下的slidesToShow和slidesToScroll等属性。这样就可以解决报错"Cannot read properties of undefined (reading 'responsive')"。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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