如何使用html5制作loading图-成都创新互联网站建设

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如何使用html5制作loading图

小编给大家分享一下如何使用html5制作loading图,相信大部分人都还不怎么了解,因此分享这篇文章给大家参考一下,希望大家阅读完这篇文章后大有收获,下面让我们一起去了解一下吧!

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代码如下:

<!DOCTYPE html>

</ title></p><p></ head></p><p><body></p><p><canvas id =“ canvas”> </ canvas> </ p> <p> <script></p><p>var Loading =功能(画布,选项){</p><p>this.canvas = document.getElementById(canvas);</p><p>this.options =选项;</p><p>}; </ p> <p> Loading.prototype = {</p><p>构造函数:正在加载,</p><p>显示:function(){</p><p>var canvas = this.canvas,</p><p>begin = this.options.begin,</p><p>old = this.options.old,</p><p>lineWidth = this .options.lineWidth,</p><p>canvasCenter = {x:canvas.width / 2,y:canvas.height / 2},</p><p>ctx = canvas.getContext(“ 2d”),</p><p>color = this.options.color,</p><p>num = this.options.num,</p><p>angle = 0 ,</p><p>lineCap = this.options.lineCap,</p><p>CONST_PI = Math.PI *(360 / num)/ 180;</p><p>window.timer = setInterval(function(){</p><p>ctx.clearRect(0,0,canvas.width,canvas.height);</p><p>for(var i = 0; i <num; i + = 1){</p><p>ctx.beginPath();</p><p>ctx.strokeStyle = color [num-1-i];</p><p>ctx.lineWidth = lineWidth;</p><p>ctx.lineCap = lineCap;</p><p>ctx.moveTo(canvasCenter.x + Math.cos(CONST_PI * i +角度)*开始,canvasCenter.y + Math.sin(CONST_PI * i +角度)*开始);</p><p>ctx.lineTo(canvasCenter.x + Math.cos(CONST_PI * i + angle)*旧,canvasCenter.y + Math.sin(CONST_PI * i + angle)* old);</p><p>ctx.stroke();</p><p>ctx.closePath();</p><p>}</p><p>angle + = CONST_PI;</p><p>console.log(angle)</p><p>},50);</p><p>},</p><p>hide:function(){</p><p>clearInterval(window.timer);</p><p>}</p><p>}; </ p> <p>(函数(){</p><p>var options = {</p><p>num:8,</p><p>begin:20,</p><p>old:40,</p><p>lineWidth:10,</p><p>lineCap:“ round”,</p><p>颜色:[“ rgb(0,0,0)”,“ rgb(20,20,20 )” ,“ rgb(40、40、40)”,“ rgb(60、60、60)”,“ rgb(80、80、80)”,“ rgb(100、100、100)”,“ rgb(120, 120,120)“,” rgb(140,140,140)“]</p><p>};</p><p>var loading = new Loading(“ canvas”,options);</p><p>loading.show();</p><p>}());</p><p></ script></p><p></ body></p><p></ html></p><p>以上是“如何使用html5制作loading图”这篇文章的所有内容,感谢各位的阅读!相信大家都有了一定的了解,希望分享的内容对大家有所帮助,如果还想学习更多知识,欢迎关注创新互联行业资讯频道!</p> <br> 网页名称:如何使用html5制作loading图 <br> 链接分享:<a 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