Uncaught TypeError: document.ready is not a function

Uncaught TypeError: document.ready is not a function报错的原因是什么，这是代码
document.ready(function() {
var mySwiper = new Swiper('.swiper-container', {
loop: true,
autoplay: true,
pagination: {
el: '.swiper-pagination',
},
})
console.log(mySwiper);
})

ready()是jquery对象的方法。只有jquery对象才能调用
要用$(document)转成jquery对象才能调用
$(document).ready(function() {});

是$(document).ready()吧