HTML5网页Loading加载效果

2020-01-27 14:17:10

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HTML5制作Loading加载效果，预览可以show and stop，制作一个Loading动画，未使用任何第三方素材，纯HTML和CSS3实现.

<!doctype html>      <html>        <head>          <meta http-equiv="content-type" content="GBK"/>          <title>HTML5-loading</title>          <script type="text/javascript">          function loading(canvas,options){             this.canvas = canvas;             if(options){               this.radius = options.radius||12;               this.circleLineWidth = options.circleLineWidth||4;               this.circleColor = options.circleColor||'lightgray';               this.dotColor = options.dotColor||'gray';             }else{                     this.radius = 12;               this.circelLineWidth = 4;               this.circleColor = 'lightgray';               this.dotColor = 'gray';             }           }           loading.prototype = {             show:function (){               var canvas = this.canvas;               if(!canvas.getContext)return;               if(canvas.__loading)return;               canvas.__loading = this;               var ctx = canvas.getContext('2d');               var radius = this.radius;                     var rotators = [{angle:0,radius:1.5},{angle:3/radius,radius:2},{angle:7/radius,radius:2.5},{angle:12/radius,radius:3}];                     var me = this;               canvas.loadingInterval = setInterval(function(){                 ctx.clearRect(0,0,canvas.width,canvas.height);                          var lineWidth = me.circleLineWidth;                 var center = {x:canvas.width/2 - radius,y:canvas.height/2-radius};                           ctx.beginPath();                 ctx.lineWidth = lineWidth;                 ctx.strokeStyle = me.circleColor;                 ctx.arc(center.x,center.y,radius,0,Math.PI*2);                 ctx.closePath();                 ctx.stroke();                 for(var i=0;i<rotators.length;i++){                           var rotatorAngle = rotators[i].currentAngle||rotators[i].angle;                               //在圆圈上面画小圆          var rotatorCenter = {x:center.x-(radius)*Math.cos(rotatorAngle) ,y:center.y-(radius)*Math.sin(rotatorAngle)};                               var rotatorRadius = rotators[i].radius;                   ctx.beginPath();                   ctx.fillStyle = me.dotColor;                   ctx.arc(rotatorCenter.x,rotatorCenter.y,rotatorRadius,0,Math.PI*2);                   ctx.closePath();                   ctx.fill();                   rotators[i].currentAngle = rotatorAngle+4/radius;                 }               },50);             },             hide:function(){               var canvas = this.canvas;               canvas.__loading = false;               if(canvas.loadingInterval){                 window.clearInterval(canvas.loadingInterval);               }               var ctx = canvas.getContext('2d');               if(ctx)ctx.clearRect(0,0,canvas.width,canvas.height);             }           };           </script>        </head>        <body>          <canvas id="canvas" width="300" height="100" style="border:1px solid #69c"></canvas>          <p>          <input type="button" onclick="loadingObj.hide()" value="HideLoading"/>          <input type="button" onclick="loadingObj.show()" value="showLoading"/>          </p>          <script>          var loadingObj = new loading(document.getElementById('canvas'),{radius:8,circleLineWidth:3});           loadingObj.show();           </script>        </body>      </html>

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