抖音如何实现下拉刷新功能代码示例

```javascript

const handleRefresh = () => {

console.log('下拉刷新');

// 模拟数据更新

setTimeout(() => {

console.log('数据更新完成');

e => e.preventDefault();

}, 1000);

};

document.addEventListener('DOMContentLoaded', () => {

const container = document.querySelector('.content');

container.addEventListener('touchmove', () => {

if (container.scrollTop === 0) {

container.addEventListener('touchend', handleRefresh, { once: true });

}

});

});

```