window.onload=function()
{
var Box = document.getElementById("Box");
var Picture = document.getElementById("Picture");
var Button = document.getElementById("Button").getElementsByTagName("span");
var arrow_left = document.getElementById("arrow_1");
var arrow_right = document.getElementById("arrow_2");
var index = 1;
function ShowButton()
{
Button[index - 1].className = "show";
}
function Scroll(offset)
{
var NewLeft = parseInt(Picture.style.left) + offset;
Picture.style.left = NewLeft + "px"
if(NewLeft > -600)
{
Picture.style.left = -1800 + "px";
}
if(NewLeft < -1800)
{
Picture.style.left = -600 + "px";
}
}
arrow_left.onclick=function()
{
index += 1;
ShowButton();
Scroll(600);
}
arrow_right.onclick=function()
{
index -= 1;
ShowButton();
Scroll(-600)
}
}
</script>报错：TypeError: Button.NaN is undefined如题，写到圆点跟随图片切换高亮的时候，这行代码报错了；我认为应该是变量index为局域变量，无法在其他封装函数里使用造成的，不知道是不是这样……翻了下课程下面的答案，好像没有和我情况遭遇一样的同学。
添加回答
举报
0/150
提交
取消