js，某元素在瀏覽器頁面浮動/飄動
阿新 • • 發佈：2020-09-09
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
.dwe{
height: 1200px;
}
</style>
</head>
<body>
<div class="dwe">_</div>
<div class="dwe">_</div>
<div class="dwe">_</div>
<div class="dwe">_</div>
<div id="Div2">
***** content ******
</div>
</body>
<script>
// JavaScript Document
//公共指令碼檔案 main.js
function addEvent(obj, evtType, func, cap) {
cap = cap || false;
if (obj.addEventListener) {
obj.addEventListener(evtType, func, cap);
return true;
} else if (obj.attachEvent) {
if (cap) {
obj.setCapture();
return true;
} else {
return obj.attachEvent("on" + evtType, func);
}
} else {
return false;
}
}
function getPageScroll() {
var xScroll, yScroll;
if (self.pageXOffset) {
xScroll = self.pageXOffset;
} else if (document.documentElement && document.documentElement.scrollLeft) {
xScroll = document.documentElement.scrollLeft;
} else if (document.body) {
xScroll = document.body.scrollLeft;
}
if (self.pageYOffset) {
yScroll = self.pageYOffset;
} else if (document.documentElement && document.documentElement.scrollTop) {
yScroll = document.documentElement.scrollTop;
} else if (document.body) {
yScroll = document.body.scrollTop;
}
arrayPageScroll = new Array(xScroll, yScroll);
return arrayPageScroll;
}
function GetPageSize() {
var xScroll, yScroll;
if (window.innerHeight && window.scrollMaxY) {
xScroll = document.body.scrollWidth;
yScroll = window.innerHeight + window.scrollMaxY;
} else if (document.body.scrollHeight > document.body.offsetHeight) {
xScroll = document.body.scrollWidth;
yScroll = document.body.scrollHeight;
} else {
xScroll = document.body.offsetWidth;
yScroll = document.body.offsetHeight;
}
var windowWidth, windowHeight;
if (self.innerHeight) {
windowWidth = self.innerWidth;
windowHeight = self.innerHeight;
} else if (document.documentElement && document.documentElement.clientHeight) {
windowWidth = document.documentElement.clientWidth;
windowHeight = document.documentElement.clientHeight;
} else if (document.body) {
windowWidth = document.body.clientWidth;
windowHeight = document.body.clientHeight;
}
if (yScroll < windowHeight) {
pageHeight = windowHeight;
} else {
pageHeight = yScroll;
}
if (xScroll < windowWidth) {
pageWidth = windowWidth;
} else {
pageWidth = xScroll;
}
arrayPageSize = new Array(pageWidth, pageHeight, windowWidth, windowHeight)
return arrayPageSize;
}
//廣告指令碼檔案 AdMove.js
/*
例子
<div id="Div2">
***** content ******
</div>
var ad=new AdMove("Div2");
ad.Run();
*/
////////////////////////////////////////////////////////
var AdMoveConfig = new Object();
AdMoveConfig.IsInitialized = false;
AdMoveConfig.ScrollX = 0;
AdMoveConfig.ScrollY = 0;
AdMoveConfig.MoveWidth = 0;
AdMoveConfig.MoveHeight = 0;
AdMoveConfig.Resize = function () {
var winsize = GetPageSize();
AdMoveConfig.MoveWidth = winsize[2];
AdMoveConfig.MoveHeight = winsize[3];
AdMoveConfig.Scroll();
}
AdMoveConfig.Scroll = function () {
var winscroll = getPageScroll();
AdMoveConfig.ScrollX = winscroll[0];
AdMoveConfig.ScrollY = winscroll[1];
}
addEvent(window, "resize", AdMoveConfig.Resize);
addEvent(window, "scroll", AdMoveConfig.Scroll);
function AdMove(id) {
if (!AdMoveConfig.IsInitialized) {
AdMoveConfig.Resize();
AdMoveConfig.IsInitialized = true;
}
var obj = document.getElementById(id);
obj.style.position = "absolute";
var W = AdMoveConfig.MoveWidth - obj.offsetWidth;
var H = AdMoveConfig.MoveHeight - obj.offsetHeight;
var x = W * Math.random(), y = H * Math.random();
var rad = (Math.random() + 1) * Math.PI / 6;
var kx = Math.sin(rad), ky = Math.cos(rad);
var dirx = (Math.random() < 0.5 ? 1 : -1), diry = (Math.random() < 0.5 ? 1 : -1);
var step = 1;
var interval;
this.SetLocation = function (vx, vy) { x = vx; y = vy; }
this.SetDirection = function (vx, vy) { dirx = vx; diry = vy; }
obj.CustomMethod = function () {
obj.style.left = (x + AdMoveConfig.ScrollX) + "px";
obj.style.top = (y + AdMoveConfig.ScrollY) + "px";
rad = (Math.random() + 1) * Math.PI / 6;
W = AdMoveConfig.MoveWidth - obj.offsetWidth;
H = AdMoveConfig.MoveHeight - obj.offsetHeight;
x = x + step * kx * dirx;
if (x < 0) { dirx = 1; x = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
if (x > W) { dirx = -1; x = W; kx = Math.sin(rad); ky = Math.cos(rad); }
y = y + step * ky * diry;
if (y < 0) { diry = 1; y = 0; kx = Math.sin(rad); ky = Math.cos(rad); }
if (y > H) { diry = -1; y = H; kx = Math.sin(rad); ky = Math.cos(rad); }
}
this.Run = function () {
var delay = 10;
interval = setInterval(obj.CustomMethod, delay);
obj.onmouseover = function () { clearInterval(interval); }
obj.onmouseout = function () { interval = setInterval(obj.CustomMethod, delay); }
}
}
var ad = new AdMove("Div2");
ad.Run();
</script>
</html>