HTML5之Canvas绘图——写文字

Canvas还有一个好的功能就是将文字书写出来，看实例
<!DOCTYPE html>
<html>
 <head>
    <meta charset="utf-8">
    <title>Canvas</title>
 </head>
 <style type="text/css">
    body{margin:20px auto; padding:0; width:800px; }
    canvas{border:dashed 2px #CCC}
 </style>
 <script type="text/javascript">
    function $$(id){
        return document.getElementById(id);
    }
    function pageLoad(){
        var can = $$(\'can\');
        var cans = can.getContext(\'2d\');
        cans.font = \'bold 144px consolas\';
        cans.textAlign = \'left\';
        cans.textBaseline = \'top\';
        cans.strokeStyle = \'#DF5326\';
        cans.strokeText(\'Hello\', 100, 100);
        cans.font = \'bold 144px arial\';
        cans.fillStyle = \'red\';
        cans.fillText(\'World\', 300,300);
    }
    function img_click(){
        var can = $$(\'can\');
        var cans = can.getContext(\'2d\');
        cans.clearRect(0,0,800,600);
    }
 </script>
<body onload="pageLoad();">
    <canvas id="can" width="800px" height="600px" onclick="img_click(this);"></canvas>
</body>
</html>