为什么我的表单每次刷新或者进入网站都会自动先发送一次

Question

<form name="info" class="infom" method="post" action=""  onSubmit="return formcheck()"> 
<label style="position:relative; left:145px;">Name<span class="redstar">*</span></label><input type="text" name="uname" style="position:relative; left:156px;"><br><br>
<label style="position:relative; left:119px;">Company<span class="redstar">*</span></label><input type="text" name="company" style="position:relative; left:131px;"><br><br>
<label style="position:relative; left:142px;">Phone<span class="redstar">*</span></label><input type="text" name="phone" style="position:relative; left:153px;"><br><br>
<label style="position:relative; left:42px;">Message</label><br>
<textarea rows="10" cols="42" style="position:relative; left:42px; width:315px;" name="message"></textarea><br>
<center><input type="submit" value="Send Message" class="submitbtn"></center>
</form>
<?php
$name = isset($_POST['uname'])?$_POST['uname']:"";
$phone = isset($_POST['phone'])?$_POST['phone']:"";
$company = isset($_POST['company'])?$_POST['company']:"";
$message = isset($_POST['message'])?$_POST['message']:"";
$msg =  "name:".$name."<br />"."phone:".$phone."<br />"."company:".$company."<br />"."message:".$message;
$to = "[email protected]";
$subject = "Soriana Contact";
$from = $name;
$headers = "From: {$name}";
if(mail($to,$subject,$msg,$headers)){
echo "<script>alert('Thanks for your support')</script>";
}else{
echo "<script>alert('Failed')</script>";
return false;
}

?>

Answer 1

这要看你的提交判断方式if(mail($to,$subject,$msg,$headers)){
echo "<script>alert('Thanks for your support')</script>";
}else{
echo "<script>alert('Failed')</script>";
return false;
}这里不管你有没有值，都会跳出提示框，你并没有在这之前做个判断

Answer 2

function formcheck(){
if(document.info.uname.value ==''||document.info.company.value ==''||document.info.phone.value ==''){
alert("The fields with * is required") ;
return false;
}

}是这个

Answer 3

<?php
if($_SERVER['REQUEST_METHOD'] != "POST") return;
你原来的 php 代码