React操作真实DOM实现动态吸底部

componentDidMount() { this.changeFixed() } //計算高度 changeFixed(){ //getDOMNode const layoutNode = document.querySelectorAll('.page-layout')[0]; const orderPriceNode = document.querySelectorAll('.test-price')[0]; window.addEventListener('scroll', function (e) { const windowInnerHeight = window.innerHeight; const layoutNodeHeight = layoutNode.offsetHeight; //滚动超出视野距离 let scrollTop = window.pageYOffset|| document.documentElement.scrollTop || document.body.scrollTop; const distanceBottom = layoutNodeHeight - scrollTop - windowInnerHeight; //120的时候吸底 if(distanceBottom <= 120){ orderPriceNode.classList.remove('fixed'); }else{ orderPriceNode.classList.add('fixed'); } }) }