How to use native js to create a starry sky effect-JS Tutorial-php.cn

How to use native js to create a starry sky effect

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Release： 2018-06-04 17:26:53

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This time I will show you how to use native js to create a starry sky effect. What are the precautions for using native js to create a starry sky effect? The following is a practical case, let’s take a look.

The code is as follows: //Add the picture to change the path

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
html{height: 100%;}
body{background: url(img/bg.jpg) no-repeat center top/cover;margin: 0;margin: 0;height: 100%;} 
//图片路径修改处
img{width: 20px;position: absolute;}
</style>
</head>
<body>
<script type="text/javascript">
//创建img
function FireWorm(){
this.node=document.createElement("img");
this.node.src="img/1.jpg";  //图片路径修改处
}
//确定img的位置
FireWorm.prototype.getpos=function(){
var Cw=document.documentElement.clientWidth;
var Ch=document.documentElement.clientHeight;
this.Left=Math.floor(Cw*Math.random()-50);
this.Top=Math.floor(Ch*Math.random()-50);
}
//显示img位置
FireWorm.prototype.showpos=function(){
this.getpos();
this.node.style.left=this.Left+"px";
this.node.style.top=this.Top+"px";
document.body.appendChild(this.node);
}
//让img飞
FireWorm.prototype.fly=function(){
this.getpos();
var _this=this;
startMove(this.node,{left:this.Left,top:this.Top},function(){
_this.fly();
})
}
for(var i=0;i<300;i++){
var oFireWorm =new FireWorm();
oFireWorm.showpos();
oFireWorm.fly();
}</script>
</body>
</html>

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I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to php Chinese Other related articles online!