编程狮在线代码实例

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<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>jQuery UI 特效 - Easing 演示</title>
  <link rel="stylesheet" href="//apps.bdimg.com/libs/jqueryui/1.10.4/css/jquery-ui.min.css">
  <script src="//apps.bdimg.com/libs/jquery/1.10.2/jquery.min.js"></script>
  <script src="//apps.bdimg.com/libs/jqueryui/1.10.4/jquery-ui.min.js"></script>
  <link rel="stylesheet" href="jqueryui/style.css">
  <style>
  .graph {
    float: left;
    margin-left: 10px;
  }
  </style>
  <script>
  $(function() {
    if ( !$( "<canvas>" )[0].getContext ) {
      $( "<div>" ).text(
        "您的浏览器不支持 canvas，本演示需要在支持 canvas 的浏览器下进行。"
      ).appendTo( "#graphs" );
      return;
    }
 
    var i = 0,
      width = 100,
      height = 100;
 
    $.each( $.easing, function( name, impl ) {
      var graph = $( "<div>" ).addClass( "graph" ).appendTo( "#graphs" ),
        text = $( "<div>" ).text( ++i + ". " + name ).appendTo( graph ),
        wrap = $( "<div>" ).appendTo( graph ).css( 'overflow', 'hidden' ),
        canvas = $( "<canvas>" ).appendTo( wrap )[ 0 ];
 
      canvas.width = width;
      canvas.height = height;
      var drawHeight = height * 0.8,
        cradius = 10;
        ctx = canvas.getContext( "2d" );
      ctx.fillStyle = "black";
 
      // 绘制背景
      ctx.beginPath();
      ctx.moveTo( cradius, 0 );
      ctx.quadraticCurveTo( 0, 0, 0, cradius );
      ctx.lineTo( 0, height - cradius );
      ctx.quadraticCurveTo( 0, height, cradius, height );
      ctx.lineTo( width - cradius, height );
      ctx.quadraticCurveTo( width, height, width, height - cradius );
      ctx.lineTo( width, 0 );
      ctx.lineTo( cradius, 0 );
      ctx.fill();
 
      // 绘制底线
      ctx.strokeStyle = "#555";
      ctx.beginPath();
      ctx.moveTo( width * 0.1, drawHeight + .5 );
      ctx.lineTo( width * 0.9, drawHeight + .5 );
      ctx.stroke();
 
      // 绘制顶线
      ctx.strokeStyle = "#555";
      ctx.beginPath();
      ctx.moveTo( width * 0.1, drawHeight * .3 - .5 );
      ctx.lineTo( width * 0.9, drawHeight * .3 - .5 );
      ctx.stroke();
 
      // 绘制 easing
      ctx.strokeStyle = "white";
      ctx.beginPath();
      ctx.lineWidth = 2;
      ctx.moveTo( width * 0.1, drawHeight );
      $.each( new Array( width ), function( position ) {
        var state = position / width,
          val = impl( state, position, 0, 1, width );
        ctx.lineTo( position * 0.8 + width * 0.1,
          drawHeight - drawHeight * val * 0.7 );
      });
      ctx.stroke();
 
      // 点击时动态改变
      graph.click(function() {
        wrap
          .animate( { height: "hide" }, 2000, name )
          .delay( 800 )
          .animate( { height: "show" }, 2000, name );
      });
 
      graph.width( width ).height( height + text.height() + 10 );
    });
  });
  </script>
</head>
<body>
 
<div id="graphs"></div>
 
 
</body>
</html>
实例代码
运行结果