$("#captchaImage").click(function () { document.getElementById("captchaImage").src = captchaPath + "?" + Math.random(); }); setInterval(function () { document.getElementById("captchaImage").src = captchaPath + "?" + Math.random(); }, 60 * 1000);
时间: 2023-12-06 21:43:25 浏览: 26
这段代码是一个 JavaScript 的事件监听器,当 id 为 "captchaImage" 的元素被点击时,会将该元素的 src 属性设置为 captchaPath 加上一个随机数。这通常用于刷新验证码图片,以防止恶意程序自动提交表单。另外,该代码还包括一个定时器,每隔 60 秒就会自动刷新一次验证码图片。
相关问题
document.addEventListener('click', function (e) { var x = e.clientX; var y = e.clientY; drawFirework(x, y); });修改为自动播放
好的,如果你要将烟花效果改为自动播放,可以将上述代码中的点击事件修改为定时器,以达到自动播放的效果。以下是修改后的代码:
```html
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>烟花绽放</title>
<style>
#canvas {
background: #000;
width: 100%;
height: 100%;
position: absolute;
top: 0;
left: 0;
}
h1 {
color: #fff;
text-align: center;
position: absolute;
top: 50%;
width: 100%;
font-size: 5rem;
font-weight: bold;
transform: translateY(-50%);
}
</style>
</head>
<body>
<canvas id="canvas"></canvas>
<h1>杨文建</h1>
<script>
// 获取canvas元素
var canvas = document.getElementById('canvas');
var ctx = canvas.getContext('2d');
// 设置canvas宽高
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
// 烟花粒子数组
var particles = [];
// 烟花粒子数量
var particleCount = 30;
// 烟花粒子构造函数
function Particle(x, y, color) {
this.x = x;
this.y = y;
this.color = color;
this.radius = 2;
this.vx = Math.random() * 10 - 5;
this.vy = Math.random() * 10 - 5;
this.gravity = 0.2;
}
// 烟花绘制函数
function drawFirework(x, y) {
// 随机颜色
var color = 'rgb(' + Math.floor(Math.random() * 255) + ',' + Math.floor(Math.random() * 255) + ',' + Math.floor(Math.random() * 255) + ')';
// 创建烟花粒子
for (var i = 0; i < particleCount; i++) {
particles.push(new Particle(x, y, color));
}
// 绘制烟花
for (var j = 0; j < particles.length; j++) {
ctx.beginPath();
ctx.arc(particles[j].x, particles[j].y, particles[j].radius, 0, Math.PI * 2);
ctx.fillStyle = particles[j].color;
ctx.fill();
// 烟花粒子运动
particles[j].x += particles[j].vx;
particles[j].y += particles[j].vy;
particles[j].vy += particles[j].gravity;
particles[j].radius -= 0.02;
}
}
// 自动播放烟花效果
setInterval(function() {
var x = Math.random() * window.innerWidth;
var y = Math.random() * window.innerHeight;
drawFirework(x, y);
}, 1000);
</script>
</body>
</html>
```
在上述代码中,我们用 `setInterval()` 函数来定时执行烟花效果的绘制函数,每隔1秒钟随机生成一组坐标,然后调用 `drawFirework()` 函数进行绘制。你可以将上述代码保存为HTML文件,然后用浏览器打开,就可以看到自动播放的烟花效果。
HTML5,JS,VUE.js网页游戏的附录
以下是 HTML5、JS 和 Vue.js 网页游戏开发时可能用到的一些附录:
## HTML5
### HTML5 标准游戏循环
```
var lastTime = 0;
var vendors = ['ms', 'moz', 'webkit', 'o'];
for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
window.cancelAnimationFrame = window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
}
if (!window.requestAnimationFrame)
window.requestAnimationFrame = function(callback, element) {
var currTime = new Date().getTime();
var timeToCall = Math.max(0, 16 - (currTime - lastTime));
var id = window.setTimeout(function() { callback(currTime + timeToCall); },
timeToCall);
lastTime = currTime + timeToCall;
return id;
};
if (!window.cancelAnimationFrame)
window.cancelAnimationFrame = function(id) {
clearTimeout(id);
};
```
### HTML5 音频开关控制
```
var soundOn = true;
function toggleSound() {
soundOn = !soundOn;
}
```
## JavaScript
### JS 获取 DOM 元素
```
var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
```
### JS 数组随机排序
```
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
currentIndex -= 1;
// And swap it with the current element.
temporaryValue = array[currentIndex];
array[currentIndex] = array[randomIndex];
array[randomIndex] = temporaryValue;
}
return array;
}
```
### JS 生成随机数
```
function getRandomInt(min, max) {
return Math.floor(Math.random() * (max - min + 1)) + min;
}
```
### JS 碰撞检测
```
function collisionDetection(obj1, obj2) {
if (obj1.x < obj2.x + obj2.width &&
obj1.x + obj1.width > obj2.x &&
obj1.y < obj2.y + obj2.height &&
obj1.y + obj1.height > obj2.y) {
return true;
}
return false;
}
```
## Vue.js
### Vue.js 组件注册
```
Vue.component('my-component', {
template: '<div>A custom component!</div>'
})
```
### Vue.js 组件通信
```
// 父组件
<template>
<div>
<child-component v-on:custom-event="handleCustomEvent"></child-component>
</div>
</template>
<script>
import ChildComponent from './ChildComponent.vue';
export default {
components: {
ChildComponent
},
methods: {
handleCustomEvent(data) {
console.log(data);
}
}
};
</script>
// 子组件
<template>
<div>
<button v-on:click="emitCustomEvent">Click me!</button>
</div>
</template>
<script>
export default {
methods: {
emitCustomEvent() {
this.$emit('custom-event', 'Custom event data!');
}
}
};
</script>
```
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