1. jquery方法实现表单验证
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
</head>
<body>
<form action="s15.html" method="POST">
<input type="text"/>
<input type="submit" value="提交"/>
</form>
<script src="jquery-1.12.4.js"></script>
<script>
$(‘:submit‘).click(function(){
var v=$(this).prev().val()
if(v.length>0){
return true;
}else{
alert(‘请输入内容‘)
return false;
}
})
</script>
</body>
</html>
2.
原文：http://www.cnblogs.com/momo8238/p/7470021.html