Question

javascript在浏览器调试时提示错误：无法获取未定义或 null 引用的属性“innerHTML”，请看代码。急急！

<script language="javascript" type="text/javascript">

var Speed = 1; //速度(毫秒)
var Space = 5; //每次移动(px)
var PageWidth = 922; //翻页宽度
var fill = 0; //整体移位
var MoveLock = false;
var MoveTimeObj;
var Comp = 0;
var AutoPlayObj = null;
GetObj("List2").innerHTML = GetObj("List1").innerHTML;此处

GetObj('ISL_Cont').scrollLeft = fill;
GetObj("ISL_Cont").onmouseover = function(){clearInterval(AutoPlayObj);}
GetObj("ISL_Cont").onmouseout = function(){AutoPlay();}
AutoPlay();
function GetObj(objName){if(document.getElementById){return eval('document.getElementById("'+objName+'")')}else{return eval('document.all.'+objName)}}
function AutoPlay(){ //自动滚动
clearInterval(AutoPlayObj);
AutoPlayObj = setInterval('ISL_GoDown();ISL_StopDown();',3000); //间隔时间
}
function ISL_GoUp(){ //上翻开始
if(MoveLock) return;
clearInterval(AutoPlayObj);
MoveLock = true;
MoveTimeObj = setInterval('ISL_ScrUp();',Speed);
}
function ISL_StopUp(){ //上翻停止
clearInterval(MoveTimeObj);
if(GetObj('ISL_Cont').scrollLeft % PageWidth - fill != 0){
Comp = fill - (GetObj('ISL_Cont').scrollLeft % PageWidth);
CompScr();
}else{
MoveLock = false;
}
AutoPlay();
}
function ISL_ScrUp(){ //上翻动作
if(GetObj('ISL_Cont').scrollLeft <= 0){GetObj('ISL_Cont').scrollLeft = GetObj('ISL_Cont').scrollLeft + GetObj('List1').offsetWidth}
GetObj('ISL_Cont').scrollLeft -= Space ;
}
function ISL_GoDown(){ //下翻
clearInterval(MoveTimeObj);
if(MoveLock) return;
clearInterval(AutoPlayObj);
MoveLock = true;
ISL_ScrDown();
MoveTimeObj = setInterval('ISL_ScrDown()',Speed);
}
GetObj("List2").innerHTML = GetObj("List1").innerHTML;此处报错

Answer 1

html结构代码也贴上来，看下里面有没有这些节点：List1、List2

Answer 2

先看看你的两个节点是否存在吧。肯定对象不存在报错的

Answer 3

很明显是你List1或List2是否拼写错误，或者存在大小写有误

Answer 4

套一个window.onload(){

}

试试。

Answer 5

你的html中没有id为List1的元素。