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javascript手工制作懸浮菜單
這篇文章主要介紹了javascript手工制作懸浮菜單，主要也是想自己練練手，感覺還不錯，這裡推薦給大家。
有選擇性的重復造一些輪子，未必是件壞事。Aaron的博客上加了一個懸浮菜單，貌似顯得很高大上了。雖然這類小把戲也不是頭一次見了，但是從未自己寫過。今天就選擇性的拿這個功能寫一寫。下面是這個輪子的開發過程，也可以當作是一篇需求文檔的分析和實現過程。
演示地址：http://sandbox.runjs.cn/show/to8wdmuy
源碼下載：https://github.com/bjtqti/floatmenu
第一步創建dom節構：
代碼如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>AppCarrier</title>
<link rel="stylesheet" href="menu.css">
</head>
<body>
<div id="content">
<h1 id="test1">test1</h1>
<p>The past can hurt. But you can either run from it or learn from it</p>
<p>過去是痛楚的，但你要麼逃避，要麼從中成長</p>
<p>One meets his destiny on the road he takes to avoid it</p>
<p>往往在逃避命運的路上，卻與之不期而遇</p>
<p>Rules are meant to be broken</p>
<p>規則就該被打破。</p>
<p>Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul.</p>
<p>歲月流逝只令容顏蒼老，激情不再卻使心靈枯萎。</p>
<h1 id="test2">test2</h1>
<p>只有不斷地練習學到的知識，你才能真正掌握它。</p>
<p>Live every day to the fullest.</p>
<p>盡享每日。</p>
<p>Keep your eyes on the stars, and your feet on the ground.</p>
<p>志存高遠，腳踏實地。</p>
<p>Always be up for an unexpected adventure.</p>
<p>隨時准備開始一場意外冒險吧。</p>
<p>Life is full of disappointment. You can't dwell on things. You have to move on.</p>
<p>生活常不如意，別沉溺往事，要勇往直前。</p>
<p>I'm a free spirit. I can't be caged.</p>
<p>我的靈魂是自由的，不該被束縛。</p>
<p>Sometimes the heart sees what is invisible to the eye.</p>
<p>目不見者，心可感之</p>
<p>The simple things are also the most extraordinary things, and only the wise can see them.</p>
<p>最平凡的事也是最非凡的事，只有智者才明白。</p>
<h1 id="test3">test3</h1>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<h1 id="test4">test4</h1>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
<p>how many xxxxxx</p>
</div>
<div class="menu" id="menubar">
<p class="static">隱藏</p>
<ul>
<li><a href="#test1">test1</a></li>
<li><a href="#test2">test2</a></li>
<li><a href="#test3">test3</a></li>
<li><a href="#test4">test4</a></li>
</ul>
</div>
</body>
<script src="menu.js"></script>
</html>
第二步准備css文件：
代碼如下:
ul {
list-style-type: none;
}
a {
text-decoration: none;
}
/*文章內容區*/
#content {
width:400px;
margin: 0 auto;
font-size: 2em;
}
/*懸浮菜單*/
.menu {
position: fixed;
top:20%;
right: 0;
width:200px;
border: 1px solid gray;
border-radius: 5px;
}
.menu li {
height: 2em;
line-height: 2em;
}
.red {
color : red;
}
.hide {
display: none;
}
/*隱藏懸浮菜單*/
.slideIn {
transform : translate3d(202px, 0, 0);
transition-duration : .5s;
}
/*顯示懸浮菜單*/
.slideOut {
transform : translate3d(0, 0, 0);
transition-duration : .5s;
}
.static {
color:#007aff;
text-align: center;
}
/*顯示懸浮球*/
.toShow {
display: block;
width: 4.8em;
height: 2em;
line-height: 2em;
border-radius: .5em;
border:1px solid gray;
transform : translate3d(-5em, 0, 0);
transition-duration : 1s;
}
第三步開始編寫js代碼：
代碼如下:
(function(doc){
//收集各章節的鏈接位置
var pos = [],
//收集菜單上的項目
links = doc.getElementsByTagName('a'),
//收集章節的標題
titles = doc.getElementsByTagName('h1'),
//懸浮菜單
menu = doc.getElementById('menubar'),
//當前選擇項
currentItem=null;
//添加紅色樣式
var addClass = function (element){
currentItem && currentItem.removeAttribute('class');
element.setAttribute('class','red');
currentItem = element;
},
//網頁被卷去的高:
getScrollTop = function (){
return Math.ceil(document.body.scrollTop)+1;
},
//計算滾動位置
startScroll = function (){
var scrollTop = getScrollTop(),
len = titles.length,
i = 0;
//第一條
if(scrollTop>=0 && scrollTop<pos[0]){
addClass(links[0]);
return;
}
//最後一條
if(scrollTop>=pos[len-1]){
addClass(links[len-1]);
return;
}
//中間
for(;i<len;i++){
if(scrollTop > pos[i] && scrollTop < pos[i+1]){
addClass(links[i]);
break;
}
}
};
//點擊列表中的鏈接變色
menu.onclick=function(e){
var target = e.target || e.srcElement;
if(target.nodeName.toLowerCase() === 'a'){
//列表項狀態指示
addClass(target);
return;
}
if(target.nodeName.toLowerCase() === 'p'){
if(target.className == 'static'){
//隱藏菜單
this.className = 'menu slideIn';
setTimeout(function(){
target.className = 'static toShow';
target.innerHTML = '顯示';
},1000);
}else{
//顯示菜單
target.className = 'static';
target.innerHTML =
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