
本文将指导你如何使用 CSS Keyframe 动画和 JavaScript创建一个箭头移动并碰撞圆形,然后改变圆形颜色的效果。我们将详细讲解 HTML 结构,CSS 样式以及 JavaScript 逻辑,并提供完整的代码示例,帮助你理解和实现该动画效果。
首先,我们需要创建包含圆形和箭头的 HTML 结构。使用 div 元素来表示圆形和箭头,并将它们放置在一个容器中。
<!DOCTYPE html>
<html>
<head>
<title>Arrow Collision Animation</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="container">
<div id="circle"></div>
<div id="arrow"></div>
</div>
<button id="hitButton" class="button">Hit</button>
<button id="clearButton" class="button">Clear</button>
<script src="script.js"></script>
</body>
</html>在这个结构中:
接下来,我们使用 CSS 来设置圆形和箭头的样式,包括位置、大小、颜色等。
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/* style.css */
#container {
position: relative;
width: 300px;
height: 150px;
}
#circle {
position: absolute;
top: 50%;
left: 20px;
transform: translate(0, -50%);
width: 100px;
height: 100px;
border-radius: 50%;
background-color: blue;
transition: background-color 0.5s;
}
#arrow {
position: absolute;
top: 50%;
left: 250px;
transform: translate(-50%, -50%);
width: 40px;
height: 10px;
background-color: black;
transition: left 0.5s;
}
#arrow:before {
content: "";
position: absolute;
top: -10px;
left: -10px;
width: 10;
height: 0;
border-top: 15px solid transparent;
border-bottom: 15px solid transparent;
border-right: 15px solid black;
}
.button {
margin-top: 10px;
}关键样式解释:
现在,我们使用 JavaScript 来实现点击 "Hit" 按钮时,箭头移动到圆形并改变圆形颜色的效果。
// script.js
var circle = document.getElementById("circle");
var arrow = document.getElementById("arrow");
var hitButton = document.getElementById("hitButton");
var clearButton = document.getElementById("clearButton");
hitButton.addEventListener("click", function() {
circleRight = circle.offsetLeft + circle.offsetWidth;
arrowLeft = circleRight + arrow.offsetWidth - 10; //Adjusted to sub 10px
arrow.style.left = arrowLeft + "px";
circle.style.backgroundColor = "green";
});
clearButton.addEventListener("click", function() {
arrow.style.left = "250px";
circle.style.backgroundColor = "blue";
});JavaScript 代码解释:
将上述 HTML、CSS 和 JavaScript 代码组合在一起,即可实现箭头碰撞圆形并改变颜色的动画效果。
HTML (index.html):
<!DOCTYPE html>
<html>
<head>
<title>Arrow Collision Animation</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<div id="container">
<div id="circle"></div>
<div id="arrow"></div>
</div>
<button id="hitButton" class="button">Hit</button>
<button id="clearButton" class="button">Clear</button>
<script src="script.js"></script>
</body>
</html>CSS (style.css):
#container {
position: relative;
width: 300px;
height: 150px;
}
#circle {
position: absolute;
top: 50%;
left: 20px;
transform: translate(0, -50%);
width: 100px;
height: 100px;
border-radius: 50%;
background-color: blue;
transition: background-color 0.5s;
}
#arrow {
position: absolute;
top: 50%;
left: 250px;
transform: translate(-50%, -50%);
width: 40px;
height: 10px;
background-color: black;
transition: left 0.5s;
}
#arrow:before {
content: "";
position: absolute;
top: -10px;
left: -10px;
width: 10;
height: 0;
border-top: 15px solid transparent;
border-bottom: 15px solid transparent;
border-right: 15px solid black;
}
.button {
margin-top: 10px;
}JavaScript (script.js):
var circle = document.getElementById("circle");
var arrow = document.getElementById("arrow");
var hitButton = document.getElementById("hitButton");
var clearButton = document.getElementById("clearButton");
hitButton.addEventListener("click", function() {
circleRight = circle.offsetLeft + circle.offsetWidth;
arrowLeft = circleRight + arrow.offsetWidth - 10; //Adjusted to sub 10px
arrow.style.left = arrowLeft + "px";
circle.style.backgroundColor = "green";
});
clearButton.addEventListener("click", function() {
arrow.style.left = "250px";
circle.style.backgroundColor = "blue";
});通过本教程,你学习了如何使用 CSS Keyframe 动画和 JavaScript 创建一个箭头移动并碰撞圆形,然后改变圆形颜色的效果。你了解了 HTML 结构、CSS 样式以及 JavaScript 逻辑,并获得了完整的代码示例。希望本教程能帮助你更好地理解和应用 CSS 动画和 JavaScript 交互。
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