制作一个简单的进度条，使用按钮控制开始，用input type="button"可以正常运行，
使用button则无效，求高手解答~~
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"
/>
<title>New Web Project</title>
<style type="text/css">
html, body {
text-align: center;
margin: 0px auto;
}
#bar2 {
background-color: #ccc;
width: 10px;
height: 20px;
}
</style>
<script>
i = 0;
function start() {
ba = setInterval('begin()', 100);
}
function begin() {
i += 1;
if(i <= 100) {
document.getElementById("bar2").style.width = i + "%";
}
}
</script>
</head>
<body >
<form>
<fieldset>
<input type="button" onclick="start();" value="start"/>
<button onclick="start();">
start2
</button>
<br />
<div id="bar2"></div>
<textarea name="txt" cols="45" wrap="soft"
readonly="true">dfadfasfasdfasdfasdfdsaf</textarea>
</fieldset>
</form>
</body>
</html>
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FROM 166.111.66.*