华山资源网

js实现随机圆与矩形功能
网络编程 2024/11/18 佚名
3 1

本文实例为大家分享了js实现随机圆与矩形功能的具体代码，供大家参考，具体内容如下

1、节点操作版

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>DOM节点操作版本</title>
</head>
<style>
 *{
  margin: 0;padding: 0;
 }
 html,body,.box{
  width: 100%;height: 100%;
 }
 #content{
  background: #f5f5f5;
 }
 .circle{
  border-radius: 50%;position: absolute;
 }
 .rect{
  position: absolute;
 }
 .btn{
  position: fixed;top: 0;left: 0;
 }
</style>
<body>
 <div id="content" class="box"></div>
 <div class="btn">
  <button id="createCircle">创建随机圆</button>
  <button id="createRect">创建随机矩形</button>
 </div>
</body>
<script>
 class Public{
  constructor(){
   this.x = this.randomR(0,1800);
   this.y = this.randomR(40,806);
   this.color = this.randomColor();
   this.r = this.randomR(10,20);
  }
  randomR(min,max){//指定范围内的随机半径
   return parseInt(Math.random() * (max - min) + min);
  }
  randomColor(){//随机颜色
   let rgba = `rgba(${this.randomR(0,255)},${this.randomR(0,255)},${this.randomR(0,255)},1)`;
   return rgba;
  }
 }
 class Circle extends Public{
  constructor(){
   super();
  }
  circle(){
   const {r,x,y,color} = this;
   const contentElem = document.getElementById("content");
   let declareElem = document.createElement("div");
   declareElem.className = "circle";
   declareElem.style.width = `${r * 2}px`;
   declareElem.style.height = `${r * 2}px`;
   declareElem.style.background = color;
   declareElem.style.top = `${y}px`;
   declareElem.style.left = `${x}px`;
   contentElem.appendChild(declareElem);
  }
 }
 class Rect extends Public{
  constructor(){
   super();
  }
  rect(){
   const {x,y,color} = this;
   const contentElem = document.getElementById("content");
   let declareElem = document.createElement("div");
   declareElem.className = "rect";
   declareElem.style.width = `${this.randomR(20,30)}px`;
   declareElem.style.height = `${this.randomR(20,30)}px`;
   declareElem.style.background = color;
   declareElem.style.top = `${y}px`;
   declareElem.style.left = `${x}px`;
   contentElem.appendChild(declareElem);
  }
 }
 document.getElementById("createCircle").onclick = () => {
  new Circle().circle();
 }
 document.getElementById("createRect").onclick = () => {
  new Rect().rect();
 }
</script>
</html>

2、鼠标拖动版本（矩形版本类似）

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <title>鼠标拖动版本</title>
</head>
<style>
 *{
  margin: 0;padding: 0;
 }
 html,body,.box{
  width: 100%;height: 100%;
 }
 #content{
  background: #f5f5f5;
 }
 .circle{
  border-radius: 50%;position: absolute;
 }
</style>
<body>
 <div id="content" class="box"></div>
</body>
<script>
 class Public{
  constructor(x,y){
   this.x = x;
   this.y = y;
   this.color = this.randomColor();
   this.r = this.randomR(10,20);
  }
  randomR(min,max){//指定范围内的随机半径
   return parseInt(Math.random() * (max - min) + min);
  }
  randomColor(){//随机颜色
   let rgba = `rgba(${this.randomR(0,255)},${this.randomR(0,255)},${this.randomR(0,255)},1)`;
   return rgba;
  }
 }
 class Circle extends Public{
  constructor(x,y){
   super(x,y);
  }
  circle(){
   const {r,x,y,color} = this;
   const contentElem = document.getElementById("content");
   let declareElem = document.createElement("div");
   declareElem.className = "circle";
   declareElem.style.width = `${r * 2}px`;
   declareElem.style.height = `${r * 2}px`;
   declareElem.style.background = color;
   declareElem.style.top = `${y}px`;
   declareElem.style.left = `${x}px`;
   contentElem.appendChild(declareElem);
   setTimeout(() => {
    declareElem.remove();
   },100);
  }
 }
 document.getElementById("content").onmousemove = (e) => {
  const {clientX,clientY} = e || window.event;
  new Circle(clientX,clientY).circle();
 }
</script>
</html>

3、canvas版本

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <meta name="viewport" content="width=device-width, initial-scale=1.0">
 <meta http-equiv="X-UA-Compatible" content="ie=edge">
 <title>Document</title>
 <style>
  #canvas{margin: 0 auto;background: #000;box-shadow: 0 0 10px #000;}
 </style>
</head>
<body>
 <canvas id="canvas"></canvas>
</body>
<script>
 var _={
  random:function(start,stop){
   return parseInt(Math.random()*(stop-start)+start);
  }
 }
 window.onload=function(){
  const canvas=document.getElementById("canvas");
  const ctx=canvas.getContext("2d");
  canvas.width="1000";
  canvas.height="600";
  class ball{
   constructor(x,y,color){
    this.x=x;
    this.y=y;
    this.r=40;
    this.color=color;
   }
   render(){
    ctx.save();
    ctx.beginPath();
    ctx.arc(this.x,this.y,this.r,0,Math.PI*2);
    ctx.fillStyle=this.color;
    ctx.fill();
    ctx.restore();
   }
  }
  class moveBall extends ball{
   constructor(x,y,color){
    super(x,y,color);
    this.dx=_.random(-5,5);
    this.dy=_.random(-5,5);
    this.dr=_.random(1,3);
   }
   updated(){
    this.x+=this.dx;
    this.y+=this.dy;
    this.r-=this.dr;
    if(this.r<=0){
     this.r=0;
    }
   }
  }
  let BallArr=[];
  let Color=["red","green","blue","white","orange"];
  canvas.addEventListener("mousemove",function(e){
   let Ball=new moveBall(e.offsetX,e.offsetY,Color[_.random(0,Color.length-1)]);
   BallArr.push(Ball);
  });
  setInterval(()=>{
   ctx.clearRect(0,0,canvas.width,canvas.height);
   for(let i=0;i<BallArr.length;i++){
    BallArr[i].render();
    BallArr[i].updated();
   }
  },50);
 }
</script>
</html>

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

华山资源网 Design By www.eoogi.com
广告合作：本站广告合作请联系QQ：858582 申请时备注：广告合作（否则不回）
免责声明：本站资源来自互联网收集,仅供用于学习和交流,请遵循相关法律法规,本站一切资源不代表本站立场,如有侵权、后门、不妥请联系本站删除！
华山资源网 Design By www.eoogi.com
www.eoogi.com 华山资源网
120,135影音资源
344,641技术资源
22,817软件资源
435,032站长资源

更新日志

友情链接

杰晶网络 DDR爱好者之家 桃源资源网 杰网资源 富贵资源网 南强小屋 铁雪资源网 幽灵资源网 万梅资源网 狼山资源网 白云岛资源网 昆仑资源网 相思资源网 明霞山资源网 内蒙古资源网 黑松山资源网 茶园资源网 饿虎岗资源网 大旗谷资源网 常春岛资源网 岱庙资源网 兴国资源网 快活林资源网 蝙蝠岛资源网 帝王谷资源网 白云城资源网 伏龙阁资源网 清风细雨楼 天枫庄资源网 圆月山庄资源网 无争山庄资源网 神水资源网 移花宫资源网 神剑山庄资源网 无为清净楼资源网 金钱帮资源网 丐帮资源网 华山资源网 极乐门资源网 小李飞刀资源网 凤求凰客栈 风云阁资源网 金狮镖局 鸳鸯亭资源网 千金楼资源网 更多链接
华山资源网 Design By www.eoogi.com