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Javascript realizes very romantic bubble popping effect_javascript skills

ringa_leeOriginal: 2018-05-14 16:12:411929browse

The example in this article describes the implementation of romantic bubble popping special effects code in JavaScript. Share it with everyone for your reference. The details are as follows:
The screenshot of the running effect is as follows:

The specific code is as follows:

Implementation idea: Only one CANVAS element is needed in HTML, and the canvas is operated in Javascript
1. Draw a background image into the canvas
2. Draw a circle with a radius of 0-10px, the x coordinate is random horizontally on the screen, and the y mark is vertical Straight larger than the screen height.
The circular background color can be random, that is, various colors!
Use timer to control y--

Build html

<!doctype html> <html>  
<head>  
<meta charset="UTF-8">  
<meta name="Generator" content="EditPlus®">  
<meta name="Author" content="">  
<meta name="Keywords" content="">  
<meta name="Description" content="">  
<title>5多个小球往上运动</title>  
<style>  
</style>  
</head>  
<body>   
<p id="d1">     
<canvas id="canvas"></canvas>   
</p>  
</body> </html>

js code

<script>   
var canvas=document.getElementById("canvas");   
var context=canvas.getContext("2d");   
canvas.width=window.innerWidth;   
canvas.height=window.innerHeight;   
function Circle()
{     
this.x=Math.random()*canvas.width;     
this.y=canvas.height;     
this.r=Math.random()*10;     
//绘制圆形     
this.paint=function()
{       
context.beginPath();       
context.arc(this.x,this.y,this.r,0,Math.PI*2);       
context.fillStyle="white";       
context.globalAlpha = 0.5;       
context.fill();     
}     
//控制圆形移动     
this.step=function()
{       
this.y--;     
}   
}   
var circles=[];   
function createCircles()
{     
var circle=new Circle();//??????     
circles[circles.length]=circle;   
}     
function paintCircles(){     
for(var i=0;i<circles.length;i++){       
circles[i].paint();     
}   
}   
function stepCircles()
{     
for(var i=0;i<circles.length;i++){       
circles[i].step();     
}   
}   
var myimg=new Image();   
myimg.src="images/demo-1.png";   
var timer="";   
setInterval(function(){     
context.drawImage(myimg,0,0);     
timer++;     
if(timer%20==0)
{       
createCircles();     
}     
paintCircles();     
stepCircles();   
},10);
 </script>

You need to add romantic elements to your website. This is a good way. I hope you can use javascript flexibly to achieve the bubble popping effect. Thank you for reading.

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