每天一个JavaScript实例-防止重复表单提交

<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<title>每天一个JavaScript实例-防止重复表单提交</title>
<style>
	#refresh{
		display: none;
		width:200px;
		height:20px;
		background-color: #ff0;

	}

</style>

<script>
var inprocess = false;
window.onload = function(){

	document.forms["picker"].onsubmit = validateSubmit;
	document.getElementById("refresh").onclick = startOver;
}
function validateSubmit () {
	// 防止重复的表单提交
	if (inprocess) return;
	inprocess = true;
	console.log(inprocess);
	document.getElementById("submitbutton").disabled = true;

	document.getElementById("refresh").style.display = "block";
	document.getElementById("message").innerHTML = "<p>正在processing,稍等</p>";
	return false;
}
function startOver(){
	inprocess = false;
	document.getElementById("submitbutton").disabled = false;
	document.getElementById("message").innerHTML = "";
	document.getElementById("refresh").style.display = "none";

}
</script>
</head>

<body>

<form id="picker" method="post" action="">
	group1:<input type="radio" name="group1" value="one" />
	group2:<input type="radio" name="group1" value="two" />
	group3:<input type="radio" name="group1" value="three" /><br /><br />
	Input 1: <input type="text" id="intext" />
	Input 2: <input type="text" id="intext2" />
	Input 3: <input type="text" id="intext3" />
	<input type="submit" id="submitbutton" value="send form" />
</form>
<div id="refresh">
	<p>单击我</p>
</div>
<div id="message"></div>
</body>
</html>

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