// 滚动事件触发
window.addEventListener('scroll',()=> {
if(this.getScrollTop() + this.getClientHeight()+50> this.getScrollHeight()) {
console.log('下拉刷新了')
//此处发起AJAX请求
}
})
// 下拉加载 获取滚动条当前的位置
getScrollTop() {
let scrollTop = 0;
if(document.documentElement && document.documentElement.scrollTop) {
scrollTop = document.documentElement.scrollTop;
} else if(document.body) {
scrollTop = document.body.scrollTop;
}
return scrollTop;
}
//获取当前可视范围的高度
getClientHeight() {
var clientHeight = 0;
if(document.body.clientHeight && document.documentElement.clientHeight) {
clientHeight = Math.min(document.body.clientHeight, document.documentElement.clientHeight);
} else {
clientHeight = Math.max(document.body.clientHeight, document.documentElement.clientHeight);
}
return clientHeight;
}
//获取文档完整的高度
getScrollHeight() {
return Math.max(document.body.scrollHeight, document.documentElement.scrollHeight);
}