伙计们，我有个问题。作为一个初学者，我试图检查密码的长度并返回结果，但它不起作用。点击按钮后，它什么也不做。我做错了什么？
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<script>
function checkpassword(){
var pas=document.getElementByName(passcode).value;
var x=pas.length;
if(x<8){
document.getElementById(message).innerHTML="Error 404!";
}
else{
document.getElementById(message).innerHTML="It's acceptable"
}
}
</script>
<body>
<input type="password" name="passcode" placeholder="Enter password to check">
<input type="submit" value="submit" onclick="checkpassword()">
<p id="message"></p>
</body>
</html>
@'Felix Kling'和@'Daniel A.White在评论中给出了一些提示，因为您必须将名称和id作为字符串传递。但另一个问题是.getElementByName()不是一个函数。你可以试试这个(注意，我使用了.getElementsByName(复数(，并引用了第I个索引的零：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
</head>
<script>
function checkpassword(){
var pas=document.getElementsByName('passcode')[0].value;
var x=pas.length;
if(x<8){
document.getElementById("message").innerHTML="Error 404!";
}
else{
document.getElementById("message").innerHTML="It's acceptable"
}
}
</script>
<body>
<input type="password" name="passcode" placeholder="Enter password to check">
<input type="submit" value="submit" onclick="checkpassword()">
<p id="message"></p>
</body>
</html>