JavaScript通過DOM操作動態(tài)創(chuàng)建、修改、移動和刪除HTML元素。1.使用document.createElement()創(chuàng)建新元素，并通過appendChild()或insertBefore()將其添加到頁面；2.通過querySelector()或getElementById()選擇現(xiàn)有元素，利用textContent、innerHTML、setAttribute()等方法進行修改；3.通過循環(huán)處理多個元素時需注意querySelectorAll()返回的是NodeList；4.移動元素可再次調用appendChild()，刪除則使用.remove()；5.動態(tài)設置樣式可通過element.style或classList實現(xiàn)，注意樣式屬性名使用camelCase。

JavaScript is a powerful tool for creating and manipulating HTML elements dynamically. Whether you're building a single-page app or just adding interactivity to a static site, knowing how to work with the DOM using JavaScript is essential.

Creating Elements from Scratch

The most basic way to create an HTML element with JavaScript is by using document.createElement(). This method takes a string representing the tag name you want to create.

For example:

const newParagraph = document.createElement('p');

Once created, this element exists in memory but isn’t yet part of the page. To make it visible, you need to append it to an existing element in the DOM. You can do that like this:

• Use appendChild() to add it at the end of a parent node
• Or use insertBefore() to place it somewhere specific

Also, don’t forget to set content inside your new element — usually done via textContent or innerHTML.

Modifying Existing Elements

To change something about an element that already exists on the page, you first need to select it using methods like querySelector() or getElementById().

Once selected, you can:

• Change its text with textContent
• Update its HTML with innerHTML
• Modify attributes using setAttribute()
• Add or remove classes with classList.add() / classList.remove()

Say you have a button and want to update its label dynamically based on some condition — this kind of manipulation makes that possible.

A common mistake here is forgetting that querySelectorAll() returns a NodeList, not a single element. So if you're trying to modify multiple items, be sure to loop through them.

Moving and Removing Elements

You’re not limited to just adding or editing — JavaScript also lets you move or remove elements as needed.

If you want to move an element somewhere else on the page, just call appendChild() again, but this time with an element that's already in the DOM. The browser will automatically move it instead of duplicating it.

Removing is even simpler: call .remove() directly on the element you want to get rid of. Just make sure you're not removing something critical unless it’s intentional.

One thing to watch out for: if you remove an element and then try to reuse it later, you’ll need to re-append it. Once removed, it no longer exists in the DOM.

Setting Styles Dynamically

Sometimes you don’t need to create or delete elements — you just want to tweak their appearance. JavaScript gives you two main options:

• Inline styling via the style property
• Adding/removing CSS classes with classList

Using element.style.color = 'red' works for quick changes, but for more complex visual updates, toggling a class is usually cleaner and easier to maintain.

Keep in mind that when setting styles directly in JS, property names are written in camelCase rather than kebab-case. For example, background-color becomes backgroundColor.

基本上就這些。

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