我是 html5 开发的新手，谁能告诉我如何使文本在画布内水平移动到另一侧。
以下是如何在屏幕上来回动画文本的示例：
<html>
<head>
<title>HTML 5 Animated Text</title>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js"></script>
<script type="text/javascript">
var context;
var text = "";
var textDirection ="";
$(function()
{
context = document.getElementById("cvs").getContext("2d");
setInterval("animate()", 30);
textDirection ="right";
textXpos = 5;
text = "Animation!";
});
function animate() {
// Clear screen
context.clearRect(0, 0, 500, 500);
context.globalAlpha = 1;
context.fillStyle = '#fff';
context.fillRect(0, 0, 500, 500);
var metrics = context.measureText(text);
var textWidth = metrics.width;
if (textDirection == "right") {
textXpos += 10;
if (textXpos > 500 - textWidth) {
textDirection = "left";
}
}
else {
textXpos -= 10;
if (textXpos < 10) {
textDirection = "right";
}
}
context.font = '20px _sans';
context.fillStyle = '#FF0000';
context.textBaseline = 'top';
context.fillText ( text, textXpos, 180);
}
</script>
</head>
<body>
<div id="page">
<canvas id="cvs" width="500" height="500">
Your browser does not support the HTML 5 Canvas.
</canvas>
</div>
</body>
</html>
行动中：http://jsfiddle.net/bS79G/ http://jsfiddle.net/bS79G/
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