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使用canvas 画环形进度条
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| <!DOCTYPE html> | |
| <html> | |
| <head> | |
| <title>circle progressbar</title> | |
| <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"></script> | |
| <script type="text/javascript"> | |
| $(document).ready(function(){ | |
| var range = $('#range'); | |
| var bg = $('#counter'); | |
| var ctx = bg[0].getContext('2d'); | |
| var imd = null; | |
| var circ = Math.PI * 2; | |
| var quart = Math.PI / 2; | |
| ctx.beginPath(); | |
| ctx.strokeStyle = '#99CC33'; | |
| ctx.lineCap = 'square'; | |
| ctx.closePath(); | |
| ctx.fill(); | |
| ctx.lineWidth = 10.0; | |
| imd = ctx.getImageData(0, 0, 240, 240); | |
| var draw = function(current) { | |
| ctx.putImageData(imd, 0, 0); | |
| ctx.beginPath(); | |
| ctx.arc(120/*x*/, 120/*y*/, 70/*r*/, -(quart)/*起始弧度 12点位置*/, ((circ) * current) - quart/*结束位置*/, false/*顺时针*/);//画圆 | |
| ctx.stroke(); | |
| } | |
| draw(range.val()/100); | |
| range.mousemove(function(){ | |
| draw(this.value/100); | |
| }) | |
| }) | |
| </script> | |
| </head> | |
| <body> | |
| <style type="text/css"> | |
| canvas { | |
| display: block; | |
| } | |
| input { | |
| width: 200px; | |
| } | |
| body { | |
| } | |
| </style> | |
| <input id="range" type="range" min="0" max="100" /> | |
| <canvas id="counter" width="240" height="240"></canvas> | |
| </body> | |
| </html> |
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