我是 javascript 的初學者，我被這段代碼困住了。從語法上看，代碼似乎沒有錯誤，但是執行時，網頁和控制臺都沒有輸出。因此，我很困惑，無法理解錯誤所在。function SubMit() {  var userName = document.getElementById("user").value;  document.getElementById("out").innerHTML = userName;  var fName = document.getElementById("firstName").value;  var lName = document.getElementById("lastName").value;  var eMail = document.getElementById("email").value;  var p1 = document.getElementById("pass1").value;  var p2 = document.getElementById("pass2").value;  console.log(userName);  console.log(fName);  console.log(lName);  console.log(eMail);  console.log(p1);  console.log(p2);}function click() {  document.getElementById("c").innerHTML = "HELLO WORLD";  console.log("hello world");}<form>  <input type="text" placeholder="Username" id="user" required>  <input type="text" placeholder="First Name" id="firstName" required>  <input type="text" placeholder="Last Name" id="lastName">  <input type="email" placeholder="Email" id="email" required>  <input type="password" placeholder="Password" id="pass1" required>  <input type="password" placeholder="Confirm Password" id="pass2" required>  <button type="submit" onclick="SubMit()">SUBMIT</button></form><output id="out"></output><button type="button" onclick="click()">click me</button><p id="c"></p>