跟着视频敲出来的，可是感觉不对，大神们帮忙看看哪出错了呗

源自：1-2 练习题

跟着视频敲出来的，可是感觉不对，大神们帮忙看看哪出错了呗

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<head>

<style>

margin:0;

padding:0;

}

body{

font-size:12px;

line-height:1.7;

}

li{

list-style:none;

}

#content{

width:800px;

margin:0 auto;

padding:20px;

}

#content h1{

color:red;

}

#content .item{

padding:20px;

margin-bottom:20px;

border:1px dotted #C00;

}

#content .item h2{

font-size:16px;

font-weight: bold;

border-bottom:2px solid #0FF;

margin-bottom:10px;

}

#content .item li{

display:inline;

margin-right:10px;

}

#content .item li a img{

width:230px;

height:230px;

border:none;

}

#menu{

position:fixed;

top:100px;

left:50%;

margin-left:400px;

width:80%;

}

#menu ul li a{

display:block;

margin:5px 0;

font-size:14px;

font-weight:bold;

color:#333;

width:80px;

height:50px;

line-height:50px;

text-decoration:none;

text-align:center;

}

#menu ul li a:hover,

#menu ul li a.current

{

color:#fff;

background:#0088bb;

}

/*解决ie6的兼容问题*/

*html,*html body{

background-image:url(about:blank);

background-attachment:fixed;

}

*html #menu{

position:absolute;

top:expression(((e=document.documentElement.scrollTop)?e:document.body.scrollTop)+100+"px");

}

</style>

/*$(document).ready(function(){

$(window).scroll(function(){

var top = $(document).scrollTop();

var menu = $("#menu");

var items = $("#content").find(".item");

var currentId = "";

items.each(function(){

var m = $(this);

var itemTop = m.offset().top;

if(top > itemTop - 200){

currentId = "#" + m.attr("id");

}

else{

return false;

}

})

var currentLink = menu.find(".current");

if(currentId && currentLink.attr("href") != currentId){

currentLink.removeClass("current");

menu.find("[href="+currentId+"]").addClass("current");

}

})

})*/

//根据class name 获取元素,因为IE浏览器对getElementsByClassName()的兼容性不好

function getByClassName(obj,cls){

var elements = obj.getElementsByTagName("*");

var result = [];

for(var i=0; i<elements.length; i++){

if(elements[i].className == cls){

result.push(elements[i]);

}

return result;

}

//由于JS里面没有removeClass和addClass方法，所以需要自己包装两个函数，其中用到正则表达式

function hasClass( obj, cls ){

return obj.className.match(new RegExp("(\\s|^)"+cls+"(\\s|$)"));

}

function removeClass( obj, cls){

if( hasClass( obj, cls)){

//remove

var reg = new RegExp("(\\s|^)"+cls+"(\\s|$)");

obj.className = obj.className.replace(reg, "" );

}

function addClass( obj, cls){

if( !hasClass( obj, cls)){

obj.className += " " +cls;

}

//页面加载要获取需要的元素

window.onload = function(){

window.onscroll = function(){

var top = document.documentElement?document.documentElement.scrollTop : document.body.scrollTop;

var menus = document.getElementById("menu").getElementsByTagName("a");

var items = getByClassName(document.getElementById("content"),"item");

var currentId = "";

for(var i=0; i<items.length; i++){

var _item = items[i];

var _itemTop = _item.offsetTop;

if(top > _itemTop-200){

currentId = _item.id;

}

else{

break;

}

//给正确的menu下的a元素class赋值

if(currentId){

for(var j=0; j<menus.length; j++){

var _menu = menus[j];

var _href = _menu.href.split("#");

if(_href[_href.length-1] != currentId){

removeClass( _menu, "current");

}

else{

addClass( _menu, "current");

}

</script>

</head>

<body>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

<ul>

</ul>

</div>

</body>

</html>

提问者：qq_李秀琴_0 2016-01-10 15:03

跟着视频敲出来的，可是感觉不对，大神们帮忙看看哪出错了呗

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