html：
<body>
<canvas width="800" height="600" id="c1">
<span>
</span>
</canvas>
<ul id="ul1">
<li>颜色版：<input id="color" type="color"/></li>
<li>笔触：<input id="num" type="number" min="0" max="100"/></li>
<li></li>
</ul>
</body>
css：
<style>
*{ margin:0; padding:0;}
body{ background:#000;}
canvas{ background:#fff; float:left;}
span{ color:#fff; font-size:80px;}
#ul1{width:100px;height:600px; float:left; background:#ccc;}
</style>
javascript:
<script>
window.onload=function(){
var oC=document.getElementById('c1');
var oColor=document.getElementById('color');
var oNum=document.getElementById('num');
var gd=oC.getContext('2d');//画笔
oNum.onchange=function(){
gd.lineWidth = oNum.value;
strokeFn();
};
oColor.onchange=function(){
gd.strokeStyle = oColor.value;
strokeFn();
};
strokeFn();
function strokeFn(){
gd.beginPath();
oC.onmousedown=function(ev){
gd.moveTo(ev.clientX,ev.clientY);
oC.onmousemove=function(ev){
gd.lineTo(ev.clientX,ev.clientY);
gd.stroke();
};
oC.onmouseup=function(){
oC.onmousemove=oC.onmouseup=null;
};
return false;
};
}
};
</script>
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