HTML5的两种Loading效果

最新推荐文章于 2025-03-06 10:37:49 发布

jin8907

最新推荐文章于 2025-03-06 10:37:49 发布

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分类专栏： HTML5 文章标签： html5 function button input html border

本文链接：https://blog.youkuaiyun.com/jin8907/article/details/8063115

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一、带着小尾巴转动的loading图标画图的思路是，首先画一个圆，然后在圆的边上按顺序画大小逐渐减小的小圆点，在每次刷新画布时改变这一系列的小圆点在大圆边上的位置。

<!doctype html>   
<html>   
  <head>   
   <meta http-equiv="content-type" content="GBK"/>   
   <title>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" οnclick="loadingObj.hide()" value="HideLoading"/>   
    <input type="button" οnclick="loadingObj.show()" value="showLoading"/>   
</style>   
    <p>   
    <script>   
    var loadingObj = new loading(document.getElementById('canvas'),{radius:8,circleLineWidth:3});   
    loadingObj.show();   
    </script>   
  </body>   
</html>

代码转至：http://developer.51cto.com/art/201205/334807.htm

二、在一个圆环上有一个相同圆心相同半径的圆弧在不停的转动。画图的步骤是首先画一个圆环，然后画一个不同颜色相同圆心半径的圆弧，在每次刷新画布时改变圆弧的起始角度。

<!doctype html>   
<html>   
<head>   
  <meta http-equiv="content-type" content="text/html;charset=gbk"/>   
  <title>loading</title>   
  <script>   
   /*   
    html5 loading 控件   
    作者：玉开 博客：http://www.cnblogs.com/yukaizhao/   
    发布或使用此控件，请保留作者声明   
    */   
    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.moveArcColor = options.moveArcColor||'gray';   
      }else{   
        this.radius = 12;   
        this.circelLineWidth = 4;   
        this.circleColor = 'lightgray';   
        this.moveArcColor = '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 me = this;   
        var rotatorAngle = Math.PI*1.5;   
        var step = Math.PI/6;   
        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();   
          //在圆圈上面画小圆   
          ctx.beginPath();   
          ctx.strokeStyle = me.moveArcColor;   
          ctx.arc(center.x,center.y,radius,rotatorAngle,rotatorAngle+Math.PI*.45);   
          ctx.stroke();   
          rotatorAngle+=step;   
        },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">您的浏览器不支持html5哟</canvas>   
    <p>   
    <input type="button" οnclick="loadingObj.hide()" value="HideLoading"/>   
    <input type="button" οnclick="loadingObj.show()" value="showLoading"/>   
    </p>   
    <script>   
    var loadingObj = new loading(document.getElementById('canvas'),{radius:8,circleLineWidth:3});   
    loadingObj.show();   
    </script>   
  </body>   
</html>

代码转至：http://developer.51cto.com/art/201205/334807.htm