The example in this article describes the jquery code to implement the loading progress bar prompt effect. Share it with everyone for your reference. The details are as follows:
The screenshot of the running effect is as follows:
The specific code is as follows:
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <title>进度条</title> <script type="text/javascript" src="http://lib.sinaapp.com/js/jquery/1.4.1/jquery.min.js"></script> </head> <body> <div class="spinner"> </div> </body> </html>
css style:
body,div {
padding: 0;
margin: 0;
}
div.spinner {
position: absolute;
width: 160px;
height: 160px;
margin-left: 240px;
margin-top: 350px;
}
div.loaderdot {
position: absolute;
width: 20px;
height: 20px;
border-radius: 50%;
background-color: rgb(29, 140, 248);
} 1 window.onload = function() {
js code:
var total = 16,
angle = 3 * Math.PI,
Radius = 80,
html = '';
var spinnerL = parseInt($("div.spinner").css("margin-left"));
var spinnerT = parseInt($("div.spinner").css("margin-top"));
for (var i = 0; i < total; i++) {
//对每个元素的位置和透明度进行初始化设置
var loaderL = Radius + Radius * Math.sin(angle) - 10;
var loaderT = Radius + Radius * Math.cos(angle) - 10;
html += "<div class='loaderdot' style='left:" + loaderL + "px;top:" + loaderT + "px; opacity:" + i / (total - 1) + "'></div>";
angle -= 2 * Math.PI / total;
}
$("div.spinner").empty().html(html);
var lastLoaderdot = $("div.loaderdot").last();
timer = setInterval(function() {
$("div.loaderdot").each(function() {
var self = $(this);
var prev = self.prev().get(0) ? self.prev() : lastLoaderdot,
opas = prev.css("opacity");
self.animate({
opacity: opas
}, 50);
});
}, 60);
27}I hope this article will be helpful to everyone learning jquery programming.
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