为什么ie9的swiper失效

echo-swiper

var mySwiper = new Swiper('.swiper-container', {
    direction: 'horizontal',
    loop: true,
    autoplay: {
        delay: 4000,
    },
    pagination: {
        el: '.swiper-pagination',
        paginationType: 'custom',
        clickable: true,
        renderBullet: function (index, className) {
            var text = $(".swiper-slide").eq(index + 1).attr('src');
            var pictype = $(".swiper-slide").eq(index + 1).next('input').val();
            return '<li class="' + className + '"color:#ffc66d;">typeblock(this)"color:#ffc66d;">typenone(this)"><img src="' + text + '"><div class="pictype">' + pictype + '</div></li>';
        },
    },
    navigation: {
        nextEl: '.swiper-button-right',
        prevEl: '.swiper-button-left',

    }
});这个是swiper的初始化代码，ie11可以，ie9就报错