有5个框，可以通过鼠标事件（鼠标悬停，鼠标移出并单击）将其从“白色” <->“黄色”颜色更改。还有一个蓝色区域，其文本显示单击框的级别。 单击第三个框后，我在蓝色区域得到了“硬水平”文本，在黄色中得到了3个框颜色。
我需要的是通过单击重置按钮将其恢复为默认级别（“轻松级别”，并且第一个框只有黄色）。
我一直在尝试这样做，但是它不起作用：
resetBtn = document.querySelector('#update');
和事件监听器：
resetBtn.addEventListener('click', highlightStars(`#star1`), true)
这里是一个例子：
window.addEventListener('DOMContentLoaded', changeStars, false);
const resetBtn = document.querySelector('#update');
/* Change level of the game depending on user choice */
function changeStars() {
/* Displaying level text inside blue box */
const updateAltText = currentLevelIndex => {
let levelText = document.querySelector('#level-text');
/* 'currentLevelIndex + 1' replaces event 'currentElement' */
levelText.textContent = document.querySelector(`#star${currentLevelIndex + 1}`).alt;
}
/* Captcha level number - default is 1 */
const getNumber = str => Number(str.match(/\d+/)[0]) || 1;
/* Star index is always one number lower than level number (indexing rules) */
const getStarIndex = event => getNumber(event.target.id) - 1;
let stars = document.querySelectorAll('.star');
const handleStarClick = event => {
/* FIRST - blocking possibility to change star behaviour by mouse events */
gameLevel.removeEventListener('mouseover', highlightStars);
gameLevel.removeEventListener('mouseout', highlightStars);
/* SECOND - making all needed star with yellow color */
const stars = document.querySelectorAll('.star');
for (let i = 0; i <= getStarIndex(event); i++) {
stars[i].classList.add('yellow');
}
};
const highlightStars = event => {
const starIndex = getStarIndex(event);
updateAltText(starIndex);
for (let i = 1; i <= starIndex; i++) {
const star = document.querySelector(`#star${i + 1}`);
star.classList.toggle('yellow');
}
};
// resetBtn.addEventListener('click', highlightStars(`#star1`), true);
resetBtn.addEventListener('click', updateAltText(0), true);
const gameLevel = document.querySelector('.game-level');
gameLevel.addEventListener("mouseover", highlightStars);
gameLevel.addEventListener("mouseout", highlightStars);
gameLevel.addEventListener('click', handleStarClick, {once: true});
} .stars {
display: flex;
margin: 10px auto;
width: 500px;
}
input[type='image'] {
width: 60px;
height: 60px;
border: thin solid black;
}
.yellow {
background-color: yellow;
}
.game-level {
display: flex;
width: 300px;
height: 100%;
}
.level-block {
display: flex;
width: 200px;
margin-left: 10px;
justify-content: center;
align-items: center;
border: 1px solid hsl(217, 86%, 50%);
border-radius: 25px;
background-color: hsl(212, 29%, 80%);
}
.level-block > span {
font-size: 18px;
}
.reset {
width: 80px;
height: 80px;
} <div class="stars">
<div class="game-level">
<input type="image" class="star yellow" id="star1" src="" width="60" alt="easy level">
<input type="image" class="star" id="star2" src="" width="60" alt="normal level">
<input type="image" class="star" id="star3" src="" width="60" alt="hard level">
<input type="image" class="star" id="star4" src="" width="60" alt="very hard level">
<input type="image" class="star" id="star5" src="" width="60" alt="impossible level">
</div>
<div class="level-block">
<span id="level-text">Easy level</span>
</div>
</div>
<input type="button" class="reset" id="update" value="RESET">
答案 0 :(得分：0)
以下演示仅将JavaScript用于单击事件，所有鼠标事件（即，悬停）均为纯CSS。重置行为只是删除所有按钮上的.active类，然后将.active类添加到第一个按钮。重置后不会显示第一个按钮标题，而是显示重置按钮标题："Game Reset"，如果没有确认重置的信息，可能会使用户感到困惑。演示中还包含其他逻辑上一致的行为，例如切换，将鼠标悬停到临时状态以及单击以获取持久状态等。演示中会详细说明。
// Reference the form
const stars = document.forms.stars;
/*
Register the form to the click event -- when a click occurs anywhere on or within the form, callback function twinkle() is
called
*/
stars.onclick = twinkle;
/**
//A -- twinkle passes a reference to the Event Object... (e)
//B1 - Two Event Object properties are used to reference:
The tag the was clicked by user: event.target
The tag registered to the event: event.currentTarget
//B2 - The HTMLFormElement property: .elements collects all form
controls into a Live HTML Collection (aka NodeList)
//C -- ui.star is a Collection of form controls with [name=star]
The brackets [] and spread operator ... converts the
NodeList into an Array
//D -- Reference the message tag. If the clicked tag was the reset
button -- for...of loop iterates through each [name=star]
and removes the class .active from all [name=star]
//E1 - Next add .active class to the default button
//E2 - Set the legend.message text to the value of clicked button
[title] attribute...
~~~~~~~
//F -- ...But if a button.star was clicked, a check to verify if
clicked tag has the .active class -- then a for...of
loop identical to the one described in line D is used to
remove any .active class.
//G -- After there are no .active, the Boolean declared in line F
determines whether the clicked tag gets the .active class
and its [title] attribute displayed or not
*/
function twinkle(e) {
const active = e.target;
const ui = e.currentTarget.elements;
const starZ = [...ui.star];
const msg = document.querySelector(".message");
if (active.matches("#clear")) {
for (let star of starZ) {
star.classList.remove("active");
}
ui.star1.classList.add('active');
msg.textContent = active.title;
} else if (active.matches(".star")) {
let status = active.classList.contains("active");
for (let star of starZ) {
star.classList.remove("active");
}
if (!status) {
active.classList.add("active");
msg.textContent = active.title;
} else {
active.classList.remove("active");
msg.textContent = "";
}
}
return false;
}:root {
font: 400 small-caps 2.5vw/1 Arial
}
.levels {
display: table;
width: 96%;
height: auto;
border: 1px solid hsl(217, 86%, 50%);
border-radius:4px;
}
.message {
display: table-caption;
width: 40vw;
height: 6vh;
margin: 0 auto 2vh;
padding: 0.5vh 0;
border: 1px solid hsl(217, 86%, 50%);
border-radius: 1.5rem;
background-color: hsla(212, 29%, 80%, 25%);
text-align: center;
font-size: 1.5rem;
color: #0078D7;
}
#clear {
float: right;
transform: rotate(45deg);
padding: 0;
border: none;
background: none;
font-size: 3.5rem;
cursor: pointer;
}
#clear:focus {
outline: 0;
}
/*
Flex is applied to the button.star'S parent tag so the order
property can be utilized.
*/
.flex {
display: flex;
justify-content: space-evenly;
align-items: center;
width: 70vw;
}
.star {
display: table-cell;
position: relative;
width: 16vw;
height: 24vh;
border: thin solid black;
background: #DDD;
font-size: 3.75rem;
text-align: center;
vertical-align: middle;
cursor: pointer;
}
/*
GSC (General Sibling Combinator: ~ ) provides highlighting across
multiple buttons.
Exp. 5 buttons: [-] [-] [X] ~ [>] ~ [>]
*/
.star.active,
.star:hover,
.star.active ~ .star,
.star:hover ~ .star {
background: gold;
}
/*
HTML layout has button.star in reverse order. Applying order to
each button rectifies the order by APPEARING in order while the
HTML structure remains reversed.
*/
#star1 {
order: 1;
border-top-left-radius: 6px;
border-bottom-left-radius: 6px;
}
#star2 {
order: 2;
}
#star3 {
order: 3;
}
#star4 {
order: 4;
}
#star5 {
order: 5;
border-top-right-radius: 6px;
border-bottom-right-radius: 6px;
}
#star1:hover,
#star1.active {
color: #5BC0DE;
}
#star2:hover,
#star2.active {
color: #FF1C8D;
}
#star3:hover,
#star3.active {
color: #00D800;
}
#star4:hover,
#star4.active {
color: #0000D5;
}
#star5:hover,
#star5.active {
color: #D50000;
}<form id="stars" action="">
<fieldset name="levels" class="levels">
<legend class="message">Novice</legend>
<button id="clear" type="reset" title="Game Reset">🔄</button>
<section class="flex">
<button id="star5" name='star' class="star" title="Master">🟐</button>
<button id="star4" name='star' class="star" title="Expert">🟌</button>
<button id="star3" name='star' class="star" title="Advanced">🟊</button>
<button id="star2" name='star' class="star" title="Intermediate">🟆</button>
<button id="star1" name='star' class="star active" title="Novice">🟂</button>
</section>
</fieldset>
</form>