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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function test(){
var txtCon=document.getElementById("test");
alert(parseFloat(txtCon.value).toFixed(2));
}
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<input type="text" id="test" />
<input type="button" onclick="test()" value="測試" />
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<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript">
function test(){
var txtCon=document.getElementById("test");
alert(parseFloat(txtCon.value).toFixed(2));
}
</script>
</head>
<body>
<input type="text" id="test" />
<input type="button" onclick="test()" value="測試" />
</body>
</html>