我正在处理一个表单，该表单具有一个称为金额字段的字段，在该字段上将显示一个比泛卡字段大的数字大于2000的字段，我尝试使用javascript，但最终在下面的这段代码中找到了该代码：
var amnt=document.getElementById("amount").value;
var pandiv=document.getElementById("pancarddiv");
function showPanfield(){
if(amnt.value >= 2000){
pandiv.style.display="block";
}
else{
pandiv.style.display="none";
}
}<!doctype html>
<html lang="en">
<head>
<title>Donation Form</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="css/bootstrap.min.css"/>
<script src="js/bootstrap.min.js"></script>
<script src="js/jquery.min.js"></script>
<style>
div#pancarddiv {
display: none;
}
</style>
</head>
<body>
<div class="container-fluid">
<div class="row">
<form action="" method="POST">
<div class="col-lg-12 col-md-12 col-sm-12 form-group">
<label>Full Name*</label>
<input type="text" class="form-control" id="name" name="fname" required/>
</div>
<div class="col-lg-12 col-md-12 col-sm-12 form-group">
<label>Postal Address*</label>
<textarea class="form-control" rows="4" id="Address" name="address" required></textarea>
</div>
<div class="col-lg-6 col-md-6 col-sm-12 form-group">
<label>Mobile No.*</label>
<input type="number" class="form-control" id="mobileno" name="mobile" required/>
</div>
<div class="col-lg-6 col-md-6 col-sm-12 form-group">
<label>Email Id*</label>
<input type="email" class="form-control" id="email" name="email" required/>
</div>
<div class="col-lg-12 col-md-12 col-sm-12 form-group">
<label>Amount (Rs.)*</label>
<input oninput="showPanfield()" type="number" class="form-control" id="amount" name="amount" required/>
</div>
<div class="col-lg-12 col-md-12 col-sm-12 form-group" id="pancarddiv">
<label>Pan Card No*</label>
<input type="text" class="form-control" id="panid" name="panid"/>
</div>
<div class="col-lg-12 col-md-12 col-sm-12 form-group">
<button type="submit" class="btn btn-default">Submit</button>
</div>
</form>
</div>
</div>
</body>
</html>我希望有人能帮助我解决我落后的问题。
您已经在这里获取amnt的值
var amnt=document.getElementById("amount").value;
因此将其从条件中删除
var amnt=document.getElementById("amount").value;
var pandiv=document.getElementById("pancarddiv");
function showPanfield(){
if (amnt >= 2000){
pandiv.style.display="block";
}
else {
pandiv.style.display="none";
}
}