Javascript implements random star display effects_javascript skills-JS Tutorial-php.cn

Javascript implements random star display effects_javascript skills

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Release： 2016-05-16 15:17:27

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The example in this article explains the detailed code of javascript to implement random star display effects. The specific content is as follows

(1) The background of the webpage is black
(2) Random size of stars: min=15, max=80
(3) The coordinates of the stars are random:
x_left=0,x_right=(browser width-star width)
y_top=0,y_bottom=?
(4) Click a star and the star disappears
(5) The webpage is loaded and stars start to display
(6) Timer: insert a star every other cycle

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script type="text/javascript">
//定义全局变量
var img_width_min = 15;
var img_width_max = 80;
var x_left = 0;
var x_right = 0;
var y_top = 0;
var y_bottom = 0;

//定义初始化的函数
function init()
{
 document.body.bgColor = "#000";
 x_right = window.innerWidth - img_width_max;
 y_bottom = window.innerHeight - img_width_max;
 //定时器
 setInterval("showStar()",1000);
}
//显示星星
function showStar()
{
 //创建一个图片
 var node_img = document.createElement("img");
 //随机图片大小和随机坐标
 var width = getRandom(img_width_min,img_width_max);
 var x = getRandom(x_left,x_right);
 var y = getRandom(y_top,y_bottom);
 //增加src的属性
 node_img.setAttribute("src","images/xingxing.gif");
 //增加style属性
 var style = "position:absolute;left:"+x+"px;top:"+y+"px;";
 style += "width:"+width+"px;";
 node_img.setAttribute("style",style);
 //增加一个onclick事件属性
 node_img.setAttribute("onclick","removeImg(this)");
 //将图片追加到<body>元素下
 document.body.appendChild(node_img);
}
function removeImg(obj)
{
 document.body.removeChild(obj);
}
function getRandom(min,max)
{
 return Math.floor(Math.random()*(max-min)+min);
}
</script>
</head>

<body onload="init()">
</body>
</html>

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I hope this article will be helpful to everyone’s JavaScript programming design.