修复了我的显示屏问题，但我认为我的输出有条件语句错误

因此，我正在尝试让我的用户启示显示显示器和USERSTROCE和USERERROR在用户输入其输入之前都没有显示。我不明白我的脚本在哪里出错

编辑：因此，我让DisplayBlock上班了（感谢那个人），但是我尝试添加有条件的语句，以确保用户进入所有字段，现在我的错误在输入任何输入之前在页面上弹出。任何帮助都将不胜感激

     const userprompts = document.querySelector("#prompts");
    const userstory = document.querySelector("#story");
    const usererror = document.querySelector("#error");
    const submit = document.querySelector("#submit");
    submit.addEventListener("click", completestory, false);
    const reset= document.querySelector("#reset");
    reset.addEventListener("click", resetPage, false);
    document.querySelector('#name').focus();
    const thename = document.querySelector("#name");
    const firstverb = document.querySelector("#firstverb");
    const firstnoun = document.querySelector("#firstnoun");
    const adjective = document.querySelector("#adjective");
    const secondnoun = document.querySelector("#secondnoun");
    const adverb = document.querySelector("#adverb");
    const place = document.querySelector("#place");
    const storyOutput = document.querySelector("#storyOutput");
    userprompts.classList.add("displayBlock");
    userstory.classList.add("displayNone");
    usererror.classList.add("displayNone");
    function checkStory() {
      if (thename.value == "" && firstverb.value == "" && firstnoun.value == "" && adjective.value == "" && secondnoun.value == "" && adverb.value == "" && place.value == "") {
        error.classname.add("displayBlock");
        return false;
      }
      else {
        return true:
      }
    }
    function completestory() {
      let finishedstory = "";
      finishedstory += "There once was a person named " + thename.value + ". ";
      finishedstory += "One day, " + thename.value + " was " + firstverb.value + " out in the "
      + firstnoun.value + ". ";
      finishedstory += "All of a sudden, " + thename.value + " saw a " + adjective.value +
      " dragon! " ;
      finishedstory += thename.value + " thought for a second and did the only thing that came to mind "
      + " and grabbed a " + secondnoun.value + ". " ;
      finishedstory += "With the " + secondnoun.value + " in hand, " + thename.value + " jumped up and " + adverb.value + " attacked the dragon.";
      finishedstory += " The dragon became very confused and left. Our hero returned to their ancestral home of " + place.value + " ." +  " The End?";
      storyOutput.innerHTML = finishedstory;
      userprompts.classList.add("displayNone");
      userstory.classList.add("displayBlock");
      usererror.classList.add("displayNone");
      userprompts.classList.remove("displayBlock");
      userstory.classList.remove("displayNone");
      usererror.classList.remove("displayBlock");
      if (checkStory == false); {
        return;
      }
    }
    function resetPage() {
      userprompts.classList.add("displayBlock");
      story.classList.add("displayNone");
      error.classList.add("displayNone");
      userprompts.classList.remove("displayNone");
      userstory.classList.remove("displayBlock");
      usererror.classList.remove("displayBlock");
      thename.value = "";
      firstverb.value = "";
      firstnoun.value = "";
      adjective.value = "";
      secondnoun.value = "";
      adverb.value = "";
      storyOutput.innerHTML = "";
      thename.focus();
    }

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <link rel="stylesheet" href="Mod3Layout.css">
    <meta charset="utf-8">
    <title>Sean's Mad Lib</title>
  </head>
  <body>
    <h1> Sean's Wacky Mad Lib</h1><hr>
    <div id="prompts">
      <h3>Please enter your prompts here</h3>
      <p>Enter a name here:
        <input id="name" type="text" placeholder="name">
        </p>
        <p>Enter a verb here:
          <input id="firstverb" type="text" placeholder="verb 1">
          </p>
          <p>Enter a noun here:
            <input id="firstnoun" type="text" placeholder="noun 1">
            </p>
            <p>Enter an adjective here:
              <input id="adjective" type="text" placeholder="adjective">
             </p>
             <p>Enter another noun here:
               <input id="secondnoun" type="text" placeholder="noun 2">
             </p>
             <p>Enter an adverb here:
               <input id="adverb" type="text" placeholder="adverb">
             </p>
             <p>Finally, Enter a place here:
               <input id="place" type="text" placeholder="place"
               </p><br>
             <button id="submit" type="button">Submit</button>
             <p id="error">You did not answer all the questions. Please try
               again</p>
      </div>
      <div id="story">
        <p>Let's see what you wrote.</p>
        <p id="storyOutput">Hello Dave</p>
        <button id="reset" type="button" name="Reset">Reset</button>
        </div>

通过使用jQuery，您可以应用CSS。请参考下面的代码

示例代码使用jQuery应用CSS。

$("#prompts").css("background-color", "yellow");

示例代码应用类名称jQuery。

$( "#prompts" ).addClass( "displayBlock" );

您甚至可以同时删除并添加类。

$( "#prompts" ).removeClass( "displayNone" ).addClass( "displayBlock" );

在香草JS中，我建议使用.style属性更改CSS中的任何内容。

示例：

document.getElementById("myDIV").style.display = "none";

来源：

https://developer.mozilla.org/en-us/docs/web/api/htmlement/stylehttps://www.w3schools.com/jsref/prop_style_display.asp

但是，在您的情况下，您正在尝试添加类。

用于在香草JS中添加一堂课，我建议使用类列表方法。

添加示例：

const element = document.querySelector("#myDIV");
element.classList.add("mystyle");

删除示例：

const element = document.querySelector("#myDIV");
element.classList.remove("mystyle");

来源：

https://www.w3schools.com/howto/howto_js_add_class.asphttps://www.w3schools.com/howto/howto_js_remove_class.asp

您需要添加类并在用户操作中删除它们。可以使用element.classList.add()添加类，并使用element.classList.remove()删除，也未在您尝试添加的类中设置CSS属性。运行摘要以查看这是否是您想要的

const userprompts = document.querySelector("#prompts");
    const userstory = document.querySelector("#story");
    const usererror = document.querySelector("#error");
    const submit = document.querySelector("#submit");
    submit.addEventListener("click", completestory, false);
    const reset= document.querySelector("#reset");
    reset.addEventListener("click", resetPage, false);
    document.querySelector('#name').focus();
    const thename = document.querySelector("#name");
    const firstverb = document.querySelector("#firstverb");
    const firstnoun = document.querySelector("#firstnoun");
    const adjective = document.querySelector("#adjective");
    const secondnoun = document.querySelector("#secondnoun");
    const adverb = document.querySelector("#adverb");
    const place = document.querySelector("#place");
    const storyOutput = document.querySelector("#storyOutput");
    userprompts.classList.add("displayBlock");
    userstory.classList.add("displayNone");
    usererror.classList.add("displayNone");
    function checkStory() {
    }
    function completestory() {
      let finishedstory = "";
      finishedstory += "There once was a person named " + thename.value + ". ";
      finishedstory += "One day, " + thename.value + " was " + firstverb.value + " out in the "
      + firstnoun.value + ". ";
      finishedstory += "All of a sudden, " + thename.value + " saw a " + adjective.value +
      " dragon! " ;
      finishedstory += thename.value + " thought for a second and did the only thing that came to mind "
      + " and grabbed a " + secondnoun.value + ". " ;
      finishedstory += "With the " + secondnoun.value + " in hand, " + thename.value + " jumped up and " + adverb.value + " attacked the dragon.";
      finishedstory += " The dragon became very confused and left. Our hero returned to their ancestral home of " + place.value + " ." +  " The End?";
      storyOutput.innerHTML = finishedstory;
      userprompts.classList.add("displayNone");
      userstory.classList.add("displayBlock");
      usererror.classList.add("displayNone");
      userprompts.classList.remove("displayBlock");
    userstory.classList.remove("displayNone");
    usererror.classList.remove("displayBlock");
    }
    function resetPage() {
      userprompts.classList.add("displayBlock");
      story.classList.add("displayNone");
      error.classList.add("displayNone");
userprompts.classList.remove("displayNone");
    userstory.classList.remove("displayBlock");
    usererror.classList.remove("displayBlock");
      thename.value = "";
      firstverb.value = "";
      firstnoun.value = "";
      adjective.value = "";
      secondnoun.value = "";
      adverb.value = "";
      storyOutput.innerHTML = "";
      thename.focus();
    }

.displayBlock{
display: block;
}
.displayNone{
display: none;
}

<!DOCTYPE html>
<html lang="en" dir="ltr">
  <head>
    <link rel="stylesheet" href="Mod3Layout.css">
    <meta charset="utf-8">
    <title>Sean's Mad Lib</title>
  </head>
  <body>
    <h1> Sean's Wacky Mad Lib</h1><hr>
    <div id="prompts">
      <h3>Please enter your prompts here</h3>
      <p>Enter a name here:
        <input id="name" type="text" placeholder="name">
        </p>
        <p>Enter a verb here:
          <input id="firstverb" type="text" placeholder="verb 1">
          </p>
          <p>Enter a noun here:
            <input id="firstnoun" type="text" placeholder="noun 1">
            </p>
            <p>Enter an adjective here:
              <input id="adjective" type="text" placeholder="adjective">
             </p>
             <p>Enter another noun here:
               <input id="secondnoun" type="text" placeholder="noun 2">
             </p>
             <p>Enter an adverb here:
               <input id="adverb" type="text" placeholder="adverb">
             </p>
             <p>Finally, Enter a place here:
               <input id="place" type="text" placeholder="place"
               </p><br>
             <button id="submit" type="button">Submit</button>
             <p id="error">You did not answer all the questions. Please try
               again</p>
      </div>
      <div id="story">
        <p>Let's see what you wrote.</p>
        <p id="storyOutput">Hello Dave</p>
        <button id="reset" type="button" name="Reset">Reset</button>
        </div>

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