js实现常见的工具条效果

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实现功能如下：

1. 二维码展示功能；

2. “回到顶部”功能。(选择“全屏预览”，滑动滚动条，查看回到顶部功能)

效果图：

图(1) 初始效果

图(2) 鼠标悬浮效果

实例代码：

<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8" />
<title>工具条</title>
<script type="text/javascript" src="https://code.jquery.com/jquery-3.1.1.min.js"></script>
<style type="text/css">
 body{
 background-color:#69C;
 }
 .toolbar{
 position:fixed;
 left:50%;
 bottom:5px;
 margin-left:-26px;
 }
 .toolbar-item{
 position:relative;
 display:block;
 width:52px;
 height:52px;
 background-image:url(http://cdn.attach.qdfuns.com/notes/pics/201703/01/160208u95waa2sfwt27hwh.png);
 background-repeat:no-repeat;
 margin-top:1px;
 -webkit-transition:background-position 1s;
 -moz-transition:background-position 1s;
 -ms-transition:background-position 1s;
 -o-transition:background-position 1s;
 transition:background-position 1s;
 }
 .toolbar-item-wenxin{
 background-position:0 -798px;
 }
 .toolbar-item-wenxin:hover{
 background-position:0 -860px;
 }
 .toolbar-item-feedback{
 background-position:0 -426px;
 }
 .toolbar-item-feedback:hover{
 background-position:0 -488px;
 }
 .toolbar-item-app{
 background-position:0 -550px;
 }
 .toolbar-item-app:hover{
 background-position:0 -612px;
 }
 .toolbar-item-top{
 background-position:0 -674px;
 }
 .toolbar-item-top:hover{
 background-position:0 -736px;
 }
 .toolbar-layer{
 position:absolute;
 right:46px;
 bottom:-10px;
 width:172px;
 background-image:url(http://cdn.attach.qdfuns.com/notes/pics/201703/01/160208u95waa2sfwt27hwh.png);
 background-repeat:no-repeat;
 opacity:0;
 filter:alpha(opacity=0);
 -webkit-transform-origin:95% 95%;
 -moz-transition-origin:95% 95%;
 -ms-transition-origin:95% 95%;
 -o-transition-origin:95% 95%;
 transform-origin:95% 95%;
 -webkit-transition:scale(0.01);
 -moz-transition:scale(0.01);
 -ms-transition:scale(0.01);
 -o-transition:scale(0.01);
 transform:scale(0.01);
 -webkit-transition:all 1s;
 -moz-transition:all 1s;
 -ms-transition:all 1s;
 -o-transition:all 1s;
 transition:all 1s;
 }
 .toolbar-item-wenxin .toolbar-layer{
 height:212px;
 background-position:0 0;
 }
 .toolbar-item-app .toolbar-layer{
 height:194px;
 background-position:0 -222px;
 }
 .toolbar-item:hover .toolbar-layer{
 opacity:1;
 filter:alpha(opacity=100);
 -webkit-transition:scale(1);
 -moz-transition:scale(1);
 -ms-transition:scale(1);
 -o-transition:scale(1);
 transform:scale(1);
 }
</style>
<script type="text/javascript">
 $(window).on('load',function(){
 $('#backTop').on('click',go);
 $(window).on('scroll',function(){
  checkPosition($(window).height());
 }); 
 checkPosition($(window).height());//防止刚开始刷新页面，返回顶部没有隐藏的问题，先让它执行一次，使其fadeOut
 })
 //到达顶部
 function go(){
 $('html,body').scrollTop(0);
 }
 //检测位置
 function checkPosition(pos){
 if($(window).scrollTop() > pos){
  $('#backTop').fadeIn();//滚动超过一个屏的宽度，就显示
 }else{
  $('#backTop').fadeOut();
 }
 }
</script>
</head>
<body>
  <div class="toolbar">
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="toolbar-item toolbar-item-wenxin">
      <span class="toolbar-layer"></span>
    </a>
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="toolbar-item toolbar-item-feedback"></a>
    <a href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="toolbar-item toolbar-item-app">
      <span class="toolbar-layer"></span>
    </a>
    <a id="backTop" href="javascript:;" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" class="toolbar-item toolbar-item-top">
    </a>
  </div>
  <!--出现滚动条-->
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</body>
</html>

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