页面html:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>不需要页面图片显示加载</title>
<style>
html{
background: gray;
}
#loading{
z-index: 200;
position: fixed;
top: 50%;
left: 50%;
border:1px solid red;
}
#loading-screen {
display: block;
position: absolute;
text-align: center;
width: 60px;
height: 60px;
top: 50%;
-webkit-transform: translate(-50%,-50%);
transform: translate(-50%,-50%);
left: 50%;
background: white;
border-radius: 5px;
z-index: 500;
}
#canvas-font-wrap{
font-family: ‘微软雅黑‘;
position:relative;
height: 60px;
width:60px;
line-height: 60px;
text-align: center;
color: darkgray;
}
.font-center{
height: 48px;
width:48px;
border:2px solid rgb(223,223,223);
border-radius: 25px;
line-height:48px;
position: absolute;
left: 4px;
top:4px;
}
#loading-screen .vip-cvs {
position: absolute;
left: 0;
top: 0;
-webkit-transform: translate(-25%,-25%) scale(0.5);
transform: translate(-25%,-25%) scale(0.5);
}
</style>
</head>
<body>
<div id="loading">
<div id=‘loading-screen‘>
<div id="canvas-font-wrap"style="">
<div class="font-center" style="">cpp</div>
</div>
<canvas class=‘vip-cvs‘ width=‘120‘ height=‘120‘ id="canvas"></canvas>
</div>
</div>
<!--//js路径更改自己的路径-->
<script type="text/JavaScript" src="../js/jQuery.min.js" ></script>
<!--js路径更改自己的路径-->
<script type="text/javascript" src="../js/loadAnimation.js" ></script>
<script type="text/javascript">
showLoadingScreen();
</script>
</body>
</html>
页面加载打圈的js写法：
1 /**
2
3 * Created by chenxiaopeng on 2016/10/13.
4 */
5 var loadingHandel = null;
6 function initLoadingAnimate() {
7 var step = 0;
8 var bg = $(‘.vip-cvs‘)[0];
9 var ctx = bg.getContext(‘2d‘);
10 var imd = null;
11 var circ = Math.PI * 2;
12 var quart = Math.PI / 2;
13 var lineColor = ‘#e5007f‘;
14 var backforward = true;
15
16
17 ctx.clearRect(0, 0, 120, 120);
18 ctx.beginPath();
19 ctx.strokeStyle = lineColor;
20 ctx.lineCap = ‘square‘;
21 ctx.closePath();
22 ctx.fill();
23 ctx.lineWidth = 2.8;
24 imd = ctx.getImageData(0, 0, 120, 120);
25
26 var draw = function(current) {
27 ctx.putImageData(imd,0,0,0,0,120,120);
28 ctx.beginPath();
29 ctx.arc(60, 60, 50, -(quart), ((circ) * current) - quart, backforward);
30 ctx.stroke();
31 }
32 function stepDraw() {
33 //draw(0.5);
34 step += 0.01;
35 draw(step);
36 if (step >= 0.99) {
37 step = 0;
38 if (!backforward) {
39 backforward = true;
40 } else {
41 backforward = false;
42 }
43 }
44 }
45 loadingHandel = setInterval(stepDraw, 10);
46 }
47
48 function clearLoadingAnimation() {
49 clearInterval(loadingHandel);
50 }
51
52 function showLoadingScreen() {
53 initLoadingAnimate();
54 $(‘#loading‘).show();
55 }
56
57 function hideLoadingScreen() {
58 clearLoadingAnimation();
59 $(‘#loading‘).hide();
60 }
//需要引进jquery，整个页面没有图片，很棒。
时间： 2024-10-05 13:08:24