我正在开发折扣代码功能。这是我的代码：
var discount = document.getElementById("disc");
function greets(){
var input = discount.values
if(input == "Hey"){
console.log("heyback");
}
}html {
background-image: linear-gradient(to right, #ff8177 0%, #ff867a 0%, #ff8c7f 21%, #f99185 52%, #cf556c 78%, #b12a5b 100%);
text-align: center;
font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}<!DOCTYPE html>
<title>Purchase A Product!</title>
<link rel="stylesheet" href="./style.css">
<body>
<h1>Purchase A Product</h1>
<form action="https://formsubmit.co/samyking2011@gmail.com" method="POST">
<input type="text" name="name" required placeholder="Name?">
<input type="email" name="email" required placeholder="Email?">
<input type="text" name="product" id="prodbuy" placeholder="What would you like to buy?" required>
<input type="text" name="quantity" id="quant" placeholder="Quantity?">
<input id="disc" placeholder="Enter Discount Codes Here(Optional)">
<button id="discapply" type="submit" onclick="greets">Apply Promo Codes</button>
<button type="submit" id="sub">Send</button>
</form>
</body>
<script src="./script.js"></script>我的问题是，如果用户在文本框中输入内容，我该如何记录？
注意：我不能用.value代替.textContent。如有任何帮助，我们也将不胜感激。
您可能希望挂接到该元素的输入事件，如下所示：
const discount = document.getElementById("disc");
discount.addEventListener('input', ev => {
if (ev.target.value === 'Hey') {
console.log('heyback');
}
});html {
background-image: linear-gradient(to right, #ff8177 0%, #ff867a 0%, #ff8c7f 21%, #f99185 52%, #cf556c 78%, #b12a5b 100%);
text-align: center;
font-family: 'Trebuchet MS', 'Lucida Sans Unicode', 'Lucida Grande', 'Lucida Sans', Arial, sans-serif;
}<h1>Purchase A Product</h1>
<form id="f">
<input id="disc" />
</form>