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我們經(jīng)常在瀏覽網(wǎng)頁的時候會看到數(shù)據(jù)在加載時,，出現(xiàn)的LOADING提示。其實這個功能原理是很簡單的,，就是一個DIV遮蓋當(dāng)前頁面，然后Loading就在遮蓋DIV層上展示出來,，現(xiàn)在我們來動手實現(xiàn)一下,。
1.當(dāng)前頁面：
<div class="current"><a href="#" onclick="showLoading()">Loading</a></div>
2.遮罩層：
<div id="over" class="over"></div>
3.Loading展示層：
<div id="layout" class="layout"><img src="http://files.jb51.net/file_images/article/201311/2013112931.gif" alt="" /></div>
整體代碼:
<!DOCTYPE html> <html xmlns="http://www./1999/xhtml"> <head> <title></title> <style type="text/css"> .current a { font-size: 20px; }
.over {
display: none;
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #f5f5f5;
opacity:0.5;
z-index: 1000;
}
.layout {
display: none;
position: absolute;
top: 40%;
left: 40%;
width: 20%;
height: 20%;
z-index: 1001;
text-align:center;
}
</style>
<script type="text/javascript">
function showLoading()
{
document.getElementById("over").style.display = "block";
document.getElementById("layout").style.display = "block";
}
</script>
</head>
<body>
<div class="current"><a href="#" onclick="showLoading()">Loading</a></div>
<div id="over" class="over"></div>
<div id="layout" class="layout"><img src="http://files.jb51.net/file_images/article/201311/2013112931.gif" alt="" /></div>
</body>
</html>
最終效果：
在網(wǎng)上還看到另外一種實現(xiàn)方式，感覺思路不錯,，就是利用JS不斷的改變html標(biāo)簽的value值,，達到加載提示的效果，根據(jù)他的思路我自己實現(xiàn)了下,，代碼如下：
<!DOCTYPE html> <html xmlns="http://www./1999/xhtml"> <head> <title></title> <!-- <script src="Scripts/jquery-1.8.2.js"></script>--> <style type="text/css"> #tb { width: 100%; height: 100%; line-height: 10px; }
#tb tr td {
text-align: center;
}
.progressbar {
font-family: Arial;
font-weight: bolder;
color: gray;
background-color: white;
padding: 0px;
border-style: none;
}
.percent {
font-family: Arial;
color: gray;
text-align: center;
border-width: medium;
border-style: none;
}
</style>
<script type="text/javascript">
var bar = 0;
var step = "||";
/*
*第一種方式即 ：$(document).ready(function(){.....});
*/
//$(function () {
// progress();
//});
/*
*第二種方式
*/
//window.onload = function () {
// progress();
//}
/*
*第三種方式模擬 $(document).ready(function(){.....});
*/
(function () {
var ie = !!(window.attachEvent && !window.opera);
var wk = /webkit\/(\d+)/i.test(navigator.userAgent) && (RegExp.$1 < 525);
var fn = [];
var run = function () { for (var i = 0; i < fn.length; i++) fn[i](); };
var d = document;
d.ready = function (f) {
if (!ie && !wk && d.addEventListener)
return d.addEventListener('DOMContentLoaded', f, false);
if (fn.push(f) > 1) return;
if (ie)
(function () {
try { d.documentElement.doScroll('left'); run(); }
catch (err) { setTimeout(arguments.callee, 0); }
})();
else if (wk)
var t = setInterval(function () {
if (/^(loaded|complete)$/.test(d.readyState))
clearInterval(t), run();
}, 0);
};
})();
document.ready(function () {
progress();
});
function progress() {
bar = bar + 2;
step = step + "||";
document.getElementById("percent").value = bar + "%";
document.getElementById("progressbar").value = step;
if (bar <= 98) {
setTimeout("progress()", 100);
}
}
</script>
</head>
<body>
<table id="tb">
<tr>
<td>
<input type="text" size="50" class="percent" id="percent" /></td>
</tr>
<tr>
<td>
<input type="text" size="50" class="progressbar" id="progressbar" /></td>
</tr>
</table>
</body>
</html>
最終效果：
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