HTML5穿越星空，响应鼠标跟随

2024-09-05 12:18:46

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具有鼠标跟随效果的HTML5穿越星空特效，鼠标晃动一下，可改变星空穿越的方向，有种3D的味道，HTML5确实是一种比较实用的技术，在传统HTML中需要很复杂的代码完成的功能，在这里几乎是极其简单的，希望这些代码能给你带去一些参考和帮助。

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"><html lang="en"><head>	<title>Starfield</title>	<meta http-equiv="content-type" content="text/html;charset=ISO-8859-1">	<meta http-equiv="content-language" content="en">	<meta name="description" content="javascript+canvas starfield">	<meta name="keywords" content="starfield, star,3d,effect,visual,javascript,canvas,dhtml,webdesign,google,chrome">	<meta name="author" content="REZ">	<meta name="generator" content="REZ">	<meta name="version" content="2.1">	<meta name="copyright" content="REZ 2007-2009">	<meta name="robots" content="all">	<meta name="viewport" content="width=device-width,user-scalable=0,initial-scale=1.0,minimum-scale=1.0,maximum-scale=1.0">	<style type="text/css">	body  {margin:0;padding:0;background-color:#000000;font-size:0;overflow:hidden}	div   {margin:0;padding:0;position:absolute;font-size:0;overflow:hidden}	canvas{background-color:#000000;overflow:hidden}	</style></head><script type="text/javascript">function $i(id) { return document.getElementById(id); }function $r(parent,child) { (document.getElementById(parent)).removeChild(document.getElementById(child)); }function $t(name) { return document.getElementsByTagName(name); }function $c(code) { return String.fromCharCode(code); }function $h(value) { return ('0'+Math.max(0,Math.min(255,Math.round(value))).toString(16)).slice(-2); }function _i(id,value) { $t('div')[id].innerHTML+=value; }function _h(value) { return !hires?value:Math.round(value/2); }function get_screen_size()	{	var w=document.documentElement.clientWidth;	var h=document.documentElement.clientHeight;	return Array(w,h);	}var url=document.location.href;var flag=true;var test=true;var n=parseInt((url.indexOf('n=')!=-1)?url.substring(url.indexOf('n=')+2,((url.substring(url.indexOf('n=')+2,url.length)).indexOf('&')!=-1)?url.indexOf('n=')+2+(url.substring(url.indexOf('n=')+2,url.length)).indexOf('&'):url.length):512);var w=0;var h=0;var x=0;var y=0;var z=0;var star_color_ratio=0;var star_x_save,star_y_save;var star_ratio=256;var star_speed=4;var star_speed_save=0;var star=new Array(n);var color;var opacity=0.1;var cursor_x=0;var cursor_y=0;var mouse_x=0;var mouse_y=0;var canvas_x=0;var canvas_y=0;var canvas_w=0;var canvas_h=0;var context;var key;var ctrl;var timeout;var fps=0;function init()	{	var a=0;	for(var i=0;i<n;i++)		{		star[i]=new Array(5);		star[i][0]=Math.random()*w*2-x*2;		star[i][1]=Math.random()*h*2-y*2;		star[i][2]=Math.round(Math.random()*z);		star[i][3]=0;		star[i][4]=0;		}	var starfield=$i('starfield');	starfield.style.position='absolute';	starfield.width=w;	starfield.height=h;	context=starfield.getContext('2d');	context.fillStyle='rgb(0,0,0)';	context.strokeStyle='rgb(255,255,255)';	var adsense=$i('adsense');	adsense.style.left=Math.round((w-728)/2)+'px';	adsense.style.top=(h-15)+'px';	adsense.style.width=728+'px';	adsense.style.height=15+'px';	adsense.style.display='block';	}function anim()	{	mouse_x=cursor_x-x;	mouse_y=cursor_y-y;	context.fillRect(0,0,w,h);	for(var i=0;i<n;i++)		{		test=true;		star_x_save=star[i][3];		star_y_save=star[i][4];		star[i][0]+=mouse_x>>4; if(star[i][0]>x<<1) { star[i][0]-=w<<1; test=false; } if(star[i][0]<-x<<1) { star[i][0]+=w<<1; test=false; }		star[i][1]+=mouse_y>>4; if(star[i][1]>y<<1) { star[i][1]-=h<<1; test=false; } if(star[i][1]<-y<<1) { star[i][1]+=h<<1; test=false; }		star[i][2]-=star_speed; if(star[i][2]>z) { star[i][2]-=z; test=false; } if(star[i][2]<0) { star[i][2]+=z; test=false; }		star[i][3]=x+(star[i][0]/star[i][2])*star_ratio;		star[i][4]=y+(star[i][1]/star[i][2])*star_ratio;		if(star_x_save>0&&star_x_save<w&&star_y_save>0&&star_y_save<h&&test)			{			context.lineWidth=(1-star_color_ratio*star[i][2])*2;			context.beginPath();			context.moveTo(star_x_save,star_y_save);			context.lineTo(star[i][3],star[i][4]);			context.stroke();			context.closePath();			}		}	timeout=setTimeout('anim()',fps);	}function move(evt)	{	evt=evt||event;	cursor_x=evt.pageX-canvas_x;	cursor_y=evt.pageY-canvas_y;	}function key_manager(evt)	{	evt=evt||event;	key=evt.which||evt.keyCode;	//ctrl=evt.ctrlKey;	switch(key)		{		case 27:			flag=flag?false:true;			if(flag)				{				timeout=setTimeout('anim()',fps);				}			else				{				clearTimeout(timeout);				}			break;		case 32:			star_speed_save=(star_speed!=0)?star_speed:star_speed_save;			star_speed=(star_speed!=0)?0:star_speed_save;			break;		case 13:			context.fillStyle='rgba(0,0,0,'+opacity+')';			break;		}	top.status='key='+((key<100)?'0':'')+((key<10)?'0':'')+key;	}function release()	{	switch(key)		{		case 13:			context.fillStyle='rgb(0,0,0)';			break;		}	}function mouse_wheel(evt)	{	evt=evt||event;	var delta=0;	if(evt.wheelDelta)		{		delta=evt.wheelDelta/120;		}	else if(evt.detail)		{		delta=-evt.detail/3;		}	star_speed+=(delta>=0)?-0.2:0.2;	if(evt.preventDefault) evt.preventDefault();	}function start()	{	resize();	anim();	}function resize()	{	w=parseInt((url.indexOf('w=')!=-1)?url.substring(url.indexOf('w=')+2,((url.substring(url.indexOf('w=')+2,url.length)).indexOf('&')!=-1)?url.indexOf('w=')+2+(url.substring(url.indexOf('w=')+2,url.length)).indexOf('&'):url.length):get_screen_size()[0]);	h=parseInt((url.indexOf('h=')!=-1)?url.substring(url.indexOf('h=')+2,((url.substring(url.indexOf('h=')+2,url.length)).indexOf('&')!=-1)?url.indexOf('h=')+2+(url.substring(url.indexOf('h=')+2,url.length)).indexOf('&'):url.length):get_screen_size()[1]);	x=Math.round(w/2);	y=Math.round(h/2);	z=(w+h)/2;	star_color_ratio=1/z;	cursor_x=x;	cursor_y=y;	init();	}document.onmousemove=move;document.onkeypress=key_manager;document.onkeyup=release;document.onmousewheel=mouse_wheel; if(window.addEventListener) window.addEventListener('DOMMouseScroll',mouse_wheel,false);</script><body onload="start()" onresize="resize()" onorientationchange="resize()" onmousedown="context.fillStyle='rgba(0,0,0,'+opacity+')'" onmouseup="context.fillStyle='rgb(0,0,0)'"><canvas id="starfield" style="background-color:#000000"></canvas></body></html>

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