jquery implements loading progress bar prompt effect

jquery implements loading progress bar prompt effect_jquery

WBOY

Release： 2016-05-16 15:30:33

Original

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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>

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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() {

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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) &#63; self.prev() : lastLoaderdot,
    　　 opas = prev.css("opacity");
   　　 self.animate({
    　　opacity: opas
   　　}, 50);
   });
 }, 60);
27}

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I hope this article will be helpful to everyone learning jquery programming.