jquery native writing method

jQuery is an excellent JavaScript library that allows us to complete various operations using simple code, making DOM operations and event handling more convenient. However, sometimes we may need to use native JavaScript to complete some operations, such as the jQuery library is not introduced in the code framework, or we need more fine-grained control of the code. In this article, we will introduce how to use native JavaScript to simulate some common operations of jQuery.

The first step is to get the DOM element, which is the most commonly used operation with jQuery. In native JavaScript, we can use querySelector and querySelectorAll to select elements. querySelector can select an element that matches the specified selector, and querySelectorAll can select all elements that match the specified selector and return a NodeList object. For example:

// 选择 ID 为 "myButton" 的元素
const button = document.querySelector("#myButton");

// 选择所有 class 为 "myClass" 的元素
const elements = document.querySelectorAll(".myClass");

The second step is to modify the attributes or styles of the element. We can use JavaScript's setAttribute and removeAttribute methods to add or remove attributes of an element, and use the style object to set the style of an element. For example:

// 设置元素的属性
button.setAttribute("disabled", true);

// 移除元素的属性
button.removeAttribute("disabled");

// 设置元素的样式
button.style.backgroundColor = "red";

The third step is to set the text or HTML of the element. We can set the text or HTML of an element using the textContent and innerHTML attributes. For example:

// 设置元素的文本
const element = document.querySelector("#myElement");
element.textContent = "Hello, world!";

// 设置元素的 HTML
element.innerHTML = "<strong>Hello, world!</strong>";

The fourth step is to bind and unbind the event handler. We can bind and unbind event handlers using the addEventListener and removeEventListener methods. For example:

// 绑定事件处理程序
function handleClick(event) {
  console.log("Button clicked!");
}

button.addEventListener("click", handleClick);

// 解绑事件处理程序
button.removeEventListener("click", handleClick);

The fifth step is to process the class of the element. We can use the classList attribute to add, remove and switch the class of an element. For example:

const element = document.querySelector("#myElement");

// 添加类
element.classList.add("myClass");

// 移除类
element.classList.remove("myClass");

// 切换类
element.classList.toggle("myClass");

The above are some commonly used native JavaScript operations, which can correspond to jQuery and be used to simulate some common operations of jQuery. Although jQuery can make development more convenient, it is still necessary to have a deep understanding of the operation of JavaScript.

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