<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>html5 canvas文本处理</title>
<script src="js/modernizr.js"></script>
</head>
<body>
<script type="text/javascript">
window.addEventListener('load',eventWindowLoaded,false);
function eventWindowLoaded(){
canvasApp();
}
function canvasSupport(){
return Modernizr.canvas;
}
function canvasApp(){
if(!canvasSupport()){
return;
}else{
var theCanvas = document.getElementById('canvas')
var context = theCanvas.getContext("2d")
}
var message="your text"
function drawScreen(){
context.font = '50px serif';
context.fillStyle = '#ff0000';
context.fillText(message,100,80);
}
var formElement = document.getElementById("textbox")
//绑定textbox输入框
formElement.addEventListener('keyup',textBoxChanged,false);
//然后通过addEventListener()方法设置keyup事件，然后处理textBoxChanged函数
function textBoxChanged(e){
var target = e.target;
message=target.value;
drawScreen();
}
}
</script>
<canvas id="canvas" width="500" height="500">
你的浏览器无法使用canvas
小白童鞋；你的支持是我最大的快乐！！
</canvas>
<form>
Text:<input id="textbox" placeholder="your text" /><br />
</form>
</body>
</html>
