Set two buttons with javascript

In web development, JavaScript is a very important programming language. It can add dynamic effects and interactivity to web pages, making them more vivid and attractive. This article will introduce how to use JavaScript to set up two buttons to achieve some interesting functions.

First, we need to create two buttons. You can use HTML code to create these buttons and assign them a unique identifier. For example:

<button id="button1">按钮1</button>
<button id="button2">按钮2</button>

Next, we need to use JavaScript to add event handlers for these buttons. An event handler is a piece of code that automatically triggers execution when the user performs an action, such as clicking a button or moving the mouse. In our code, we will add different event handlers for button 1 and button 2.

First, let's take a look at the code to add an event handler for button 1:

var button1 = document.getElementById("button1"); // 获取按钮1元素对象
button1.onclick = function() { // 绑定单击事件处理程序
    alert("你单击了按钮1！");
};

The above code first obtains the element object of button 1 using the document.getElementById() method, and Store it in a variable. Next, we bound an event handler for button 1 using the .onclick attribute. When the user clicks button 1, the alert() method will pop up a prompt box prompting the user "You clicked button 1!".

Next, let’s take a look at how to add an event handler for button 2. When the user moves the mouse over the button, some code will be executed:

var button2 = document.getElementById("button2"); // 获取按钮2元素对象
button2.onmouseover = function() { // 绑定鼠标移到事件处理程序
    button2.style.backgroundColor = "red"; // 修改按钮的背景颜色
};
button2.onmouseout = function() { // 绑定鼠标移开事件处理程序
    button2.style.backgroundColor = "inherit"; // 恢复按钮的背景颜色
};

In the above code, We first obtain the element object of button 2 and store it in a variable. We then bound an event handler for button 2 using the .onmouseover property. When the user moves the mouse over button 2, we modify the button's background color using the .style.backgroundColor property. When the user moves the mouse away from button 2, we bind an event handler using the .onmouseout property to return the button's background color to its default value (by setting it to "inherit").

At this point, we have successfully set up event handlers for the two buttons to implement different functions. When we click button 1, a prompt box will pop up to tell the user that we clicked button 1; when we move the mouse over button 2, the background color of the button will be modified. When we move the mouse away from button 2 When turned on, the background color will be restored.

Of course, this is just a simple example of adding event handlers to two buttons using JavaScript. In actual development, we can use JavaScript to implement more complex and interesting functions, such as controlling the display and hiding of HTML elements, asynchronous loading of data, implementation of animation effects, etc. By skillfully using JavaScript to manipulate the DOM (Document Object Model), we can create more vivid and interactive web applications.

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