Unable to get property 'offsetTop' of undefined or null reference
他報(bào)這個(gè)問(wèn)題
function checkscrollside(){
??? var oParent=document.getElementById('main');
??? var aPin=getByClass(oParent,'pin');
??? var lastPinH=aPin[aPin.length-1].offsetTop+Math.floor(aPin[aPin.length-1].offsetHeight/2);
??? var scrollTop=document.documentElement.scrollTop||document.body.scrollTop；
??? var documentH=document.documentElement.clientHeight;//頁(yè)面高度
??? return (lastPinH<scrollTop+documentH)?true:false;//到達(dá)指定高度后 返回true，觸發(fā)waterfall()函數(shù)
}
2016-07-05
function check(){
? ?var oPraent=document.getElementById('main');
? ?var oBox=getByClass(oPraent,'box');
? ?var lastBOxH=oBox[oBoxs.length-1].offsetTop+Math.floor(oBoxs[oBoxs.length-1].offsetHeight/2);
? ?var scrollTop=document.body.scrollTop || document.documentElement.scrollTop;
? ?var height=document.body.clientHeight || document.documentElement.clientHeight;
? ?return (lastBOxH<scrollTop+height)?true:false;
}