我只是在学习JavaScript类是如何工作的，我只是在寻找一些关于如何实现一些非常简单的建议，我希望关于动画一些元素。
我创建了一个名为myAnimation的类，构造函数接受 1 个参数，这是一个元素。它所做的只是淡出和向内走去，一切都非常简单。当页面上只有一个标题元素时，它工作正常，我只是不确定如何让它与多个标题一起工作。
请原谅我的天真;这对我来说都是非常新的，这只是我设法让自己尝试帮助自己理解它是如何工作的的一个基本例子。
class myAnimation {
constructor(element) {
this.element = document.querySelector(element);
}
fadeOut(time) {
if (this.element.classList.contains('fadeout-active')) {
this.element.style.opacity = 1;
this.element.classList.remove('fadeout-active');
button.textContent = 'Hide Heading';
} else {
this.element.style.opacity = 0;
this.element.style.transition = `all ${time}s ease`;
this.element.classList.add('fadeout-active');
button.textContent = 'Show Heading';
}
}
}
const heading = new myAnimation('.heading');
const button = document.querySelector('.button');
button.addEventListener('click', () => {
heading.fadeOut(1);
});<div class="intro">
<h1 class="heading">Intro Heading</h1>
<p>This is the intro section</p>
<button class="button">Hide Heading</button>
</div>
<div class="main">
<h1 class="heading">Main Heading</h1>
<p>This is the main section</p>
<button class="button">Hide Heading</button>
</div>在我的评论之后，我想让脚本以一种我认为它可能是由 OP 打算的方式运行。
尽管它演示了正常运行需要做什么，但整个基本设计证明不适合OP真正可能需要实现的目标。
该类被称为Animation但从一开始它就混合了元素动画并更改了单个以某种方式全局范围的button的状态。
即使现在运行，设计也不能证明是真正的适合，因为现在将要进行动画处理的元素和它将与之交互的按钮完全传递到构造函数中。
功能分组正确，只是位置和命名不太合适。
OP 可能会考虑所提供代码的下一个迭代步骤......
class Animation {
constructor(elementNode, buttonNode) {
this.element = elementNode;
this.button = buttonNode;
// only in case both elements were passed ...
if (elementNode && buttonNode) {
// couple them by event listening/handling.
buttonNode.addEventListener('click', () => {
// - accessing the `Animation` instance's `this` context
// gets assured by making use of an arrow function.
this.fadeOut(1);
});
}
}
fadeOut(time) {
if (this.element.classList.contains('fadeout-active')) {
this.element.style.opacity = 1;
this.element.classList.remove('fadeout-active');
this.button.textContent = 'Hide Heading';
} else {
this.element.style.opacity = 0;
this.element.style.transition = `all ${time}s ease`;
this.element.classList.add('fadeout-active');
this.button.textContent = 'Show Heading';
}
}
}
function initializeAnimations() {
// get list of all elements that have a `heading` class name.
const headingList = document.querySelectorAll('.heading');
// for each heading element do ...
headingList.forEach(function (headingNode) {
// ... access its parent element and query again for a single button.
const buttonNode = headingNode.parentElement.querySelector('.button');
// if the related button element exists ...
if (buttonNode) {
// ... create a new `Animation` instance.
new Animation(headingNode, buttonNode);
}
});
}
initializeAnimations();.as-console-wrapper { max-height: 100%!important; top: 0; }<div class="intro">
<h1 class="heading">Intro Heading</h1>
<p>This is the intro section</p>
<button class="button">Hide Heading</button>
</div>
<div class="main">
<h1 class="heading">Main Heading</h1>
<p>This is the main section</p>
<button class="button">Hide Heading</button>
</div>。新的一天，下一个可能的迭代步骤...
第二次迭代将关注点分开。
它通过重命名类并仅实现特定于类的行为来实现此目的。因此，FadeToggle类仅提供切换特定功能。
然后，代码被拆分为两个处理初始化的函数。为了更好地重用初始化代码，需要将 html 结构重构为更通用的内容。每个容器的data属性(具有用于淡化目标元素的触发器元素(将用作配置存储，为初始化过程提供所有必要的信息。(甚至可以提供单独的过渡持续时间值。
最后，有一个处理程序函数，其实现方式可以由bind重用，以生成一个闭包，为每个触发器-目标对提供所有必要的数据。
class FadeToggle {
// a clean fade-toggle implementation.
constructor(elementNode, duration) {
duration = parseFloat(duration, 10);
duration = Number.isFinite(duration) ? duration : 1;
elementNode.style.opacity = 1;
elementNode.style.transition = `all ${ duration }s ease`;
this.element = elementNode;
}
isFadeoutActive() {
return this.element.classList.contains('fadeout-active');
}
toggleFade(duration) {
duration = parseFloat(duration, 10);
if (Number.isFinite(duration)) {
this.element.style.transitionDuration = `${ duration }s`;
}
if (this.isFadeoutActive()) {
this.element.style.opacity = 1;
this.element.classList.remove('fadeout-active');
} else {
this.element.style.opacity = 0;
this.element.classList.add('fadeout-active');
}
}
}
function handleFadeToggleWithBoundContext(/* evt */) {
const { trigger, target } = this;
if (target.isFadeoutActive()) {
trigger.textContent = 'Hide Heading';
} else {
trigger.textContent = 'Show Heading';
}
target.toggleFade();
}
function initializeFadeToggle(elmNode) {
// parse an element node's fade-toggle configuration.
const config = JSON.parse(elmNode.dataset.fadeToggleConfig || null);
const selectors = (config && config.selectors);
if (selectors) {
try {
// query both the triggering and the target element
const trigger = elmNode.querySelector(selectors.trigger || null);
let target = elmNode.querySelector(selectors.target || null);
if (trigger && target) {
// create a `FadeToggle` target type.
target = new FadeToggle(target, config.duration);
// couple trigger and target by event listening/handling ...
trigger.addEventListener(
'click',
handleFadeToggleWithBoundContext.bind({
// ... and binding both as context properties to the handler.
trigger,
target
})
);
}
} catch (exception) {
console.warn(exception.message, exception);
}
}
}
function initializeEveryFadeToggle() {
// get list of all elements that contain a fade-toggle configuration
const configContainerList = document.querySelectorAll('[data-fade-toggle-config]');
// do initialization for each container separately.
configContainerList.forEach(initializeFadeToggle);
}
initializeEveryFadeToggle();.as-console-wrapper { max-height: 100%!important; top: 0; }<div class="intro" data-fade-toggle-config='{"selectors":{"trigger":".button","target":".heading"},"duration":3}'>
<h1 class="heading">Intro Heading</h1>
<p>This is the intro section</p>
<button class="button">Hide Heading</button>
</div>
<div class="main" data-fade-toggle-config='{"selectors":{"trigger":".button","target":".heading"}}'>
<h1 class="heading">Main Heading</h1>
<p>This is the main section</p>
<button class="button">Hide Heading</button>
</div>。下午，改进状态变化的处理...
仍然有硬连线数据，直接写入代码中。为了摆脱每次发生切换更改时都会(重新(渲染的字符串值，可能会给基于data的配置方法另一个机会。
这一次，每个触发元素可能具有提供状态相关值的配置。因此，初始化过程需要负责检索此数据，并根据淡入淡出切换目标的初始状态呈现它。
这个目标直接提出了触发器元素的渲染函数的必要性，因为不仅最初需要更改触发器的状态，还需要在每次淡入淡出切换时更改触发器的状态。
这将再次更改处理程序函数，此外它还具有绑定状态值，以便将此类数据委托给渲染过程......
class FadeToggle {
// a clean fade-toggle implementation.
constructor(elementNode, duration) {
duration = parseFloat(duration, 10);
duration = Number.isFinite(duration) ? duration : 1;
elementNode.style.opacity = 1;
elementNode.style.transition = `all ${ duration }s ease`;
this.element = elementNode;
}
isFadeoutActive() {
return this.element.classList.contains('fadeout-active');
}
toggleFade(duration) {
duration = parseFloat(duration, 10);
if (Number.isFinite(duration)) {
this.element.style.transitionDuration = `${ duration }s`;
}
if (this.isFadeoutActive()) {
this.element.style.opacity = 1;
this.element.classList.remove('fadeout-active');
} else {
this.element.style.opacity = 0;
this.element.classList.add('fadeout-active');
}
}
}
function renderTargetStateDependedTriggerText(target, trigger, fadeinText, fadeoutText) {
if ((fadeinText !== null) && (fadeoutText !== null)) {
if (target.isFadeoutActive()) {
trigger.textContent = fadeinText;
} else {
trigger.textContent = fadeoutText;
}
}
}
function handleFadeToggleWithBoundContext(/* evt */) {
// retrieve context data.
const { target, trigger, fadeinText, fadeoutText } = this;
target.toggleFade();
renderTargetStateDependedTriggerText(
target,
trigger,
fadeinText,
fadeoutText
);
}
function initializeFadeToggle(elmNode) {
// parse an element node's fade-toggle configuration.
let config = JSON.parse(elmNode.dataset.fadeToggleConfig || null);
const selectors = (config && config.selectors);
if (selectors) {
try {
// query both the triggering and the target element
const trigger = elmNode.querySelector(selectors.trigger || null);
let target = elmNode.querySelector(selectors.target || null);
if (trigger && target) {
// create a `FadeToggle` target type.
target = new FadeToggle(target, config.duration);
// parse a trigger node's fade-toggle configuration and state.
const triggerStates = ((
JSON.parse(trigger.dataset.fadeToggleTriggerConfig || null)
|| {}
).states || {});
// get a trigger node's state change values.
const fadeinStateValues = (triggerStates.fadein || {});
const fadeoutStateValues = (triggerStates.fadeout || {});
// get a trigger node's state change text contents.
const fadeinText = fadeinStateValues.textContent || null;
const fadeoutText = fadeoutStateValues.textContent || null;
// rerender trigger node's initial text value.
renderTargetStateDependedTriggerText(
target,
trigger,
fadeinText,
fadeoutText
);
// couple trigger and target by event listening/handling ...
trigger.addEventListener(
'click',
handleFadeToggleWithBoundContext.bind({
// ... and by binding both and some text values
// that are sensitive to state changes
// as context properties to the handler.
target,
trigger,
fadeinText,
fadeoutText
})
);
}
} catch (exception) {
console.warn(exception.message, exception);
}
}
}
function initializeEveryFadeToggle() {
// get list of all elements that contain a fade-toggle configuration
const configContainerList = document.querySelectorAll('[data-fade-toggle-config]');
// do initialization for each container separately.
configContainerList.forEach(initializeFadeToggle);
}
initializeEveryFadeToggle();.as-console-wrapper { max-height: 100%!important; top: 0; }<div class="intro" data-fade-toggle-config='{"selectors":{"trigger":".button","target":".heading"},"duration":3}'>
<h1 class="heading">Intro Heading</h1>
<p>This is the intro section</p>
<button class="button" data-fade-toggle-trigger-config='{"states":{"fadeout":{"textContent":"Hide Heading"},"fadein":{"textContent":"Show Heading"}}}'>Toggle Heading</button>
</div>
<div class="main" data-fade-toggle-config='{"selectors":{"trigger":".button","target":".heading"}}'>
<h1 class="heading">Main Heading</h1>
<p>This is the main section</p>
<button class="button">Toggle Heading</button>
</div>发生这种情况是因为document.querySelector(".button")只返回类.button(引用(的第一个元素。
您可能希望尝试document.querySelectorAll(".button")(参考(来添加事件侦听器。
(虽然这只会切换你的第一个标题 - 出于同样的原因。 ;)(