JS阻止用户多次提交示例代码

 
<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Document</title>
</head>
<body>
<input type="text" id="msg">
<a href="#" id="result">提交</a>
<div id="show"></div>
<script src="jquery1.11.js"></script>
<script>
$(function(){
var flag = true;
"#result").on('click',function(){
if(flag){
flag = false;
}else{
return;
} 
"#show").html('<p>'+"#msg").val()+'</p>');
}); 
}) 
</script>
</body>
</html>

实现起来非常简单！