Javascript implements random star display effects_javascript skills
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>
I hope this article will be helpful to everyone’s JavaScript programming design.
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