menu.js

来自「仿榕树下文章系统春节版 1. 将makpass.php文件的root_pass修」· JavaScript 代码 · 共 91 行

function rnd(){return Math.random();}
function xRnd(){return (rnd()/10);}
function yRnd(){return (2 + 2*( .5 - rnd() ));}
var letitsnow = true;
var flakes = Array("1.gif","2.gif","3.gif","4.gif");
var numflakes = 10;
var T = 80;
var dx, xPos, yPos, am, vx, vy, obj, i;
var winwidth = 640;
var winheight = 480;
var snowID;

function sizeIt(){
window.winwidth = window.innerWidth?window.innerWidth:document.body.clientWidth;
window.winheight = window.innerHeight?window.innerHeight:document.body.clientHeight;
}

dx = new Array();
xPos = new Array();
yPos = new Array();
sway = new Array();
var swaymax = 20;
vx = new Array();
vy = new Array();
sizeIt();
document.write("<STYLE type=\"text/css\">\n.flk {position:absolute;top:-100;}<\/STYLE>");
for (i = 0; i < numflakes; i++) {
	var thisflake = "" + flakes[Math.floor(rnd()*flakes.length)];
	dx[i] = 0;
	xPos[i] = rnd()*(window.winwidth-30) +10;
	yPos[i] = rnd()*window.winheight;
	sway[i] = rnd()*swaymax;
	vx[i] = xRnd();
	vy[i] = yRnd();
	document.write("<div id=\"f"+ i +"\" class=\"flk\"><img src=\"");
	document.write(thisflake + "\" border=\"0\"><\/div>");
}


function snowMove(id,left,top) {
  obj = document.getElementById?document.getElementById(id).style:
  document.all?document.all[id].style:
  document.layers?document.layers[id]:null;
  if (obj) {
    obj.left=left;
    obj.top=top;
  }
}

function snowSwitch(s) {
  if ( s == "on" ) {
    if ( window.letitsnow != true ) {	
      window.letitsnow = true;
      doSnow();
    }
  } else if ( s == "off" ) {
    window.letitsnow = false;
    hideSnow();
  }
}

function hideSnow() {
  for (i = 0; i < numflakes; ++ i) snowMove("f"+i,-100,-100);
  clearInterval(snowID);
}

function doSnowRun() {
  if (letitsnow){
    delta = (window.pageYOffset!=null)?window.pageYOffset:document.body.scrollTop;
    for (i = 0; i < numflakes; ++ i) {
      yPos[i] += vy[i];
	if (yPos[i] > window.winheight+delta-50) {
	  xPos[i] = rnd()*(window.winwidth-sway[i]-30);
	  yPos[i] = delta;
	  vx[i] = xRnd();
	  vy[i] = yRnd();
	}
      dx[i] += vx[i];
      snowMove("f"+i,xPos[i]+sway[i]*Math.cos(dx[i]),yPos[i]);
    }
  }	
}
function doSnow() {
  if (letitsnow) {
    doSnowRun();
    snowID = setInterval("doSnowRun()", T);
  }
}

window.letitsnow = true;
doSnow();