📄 拉伸放缩效果的图片.txt
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把如下代码加入到<body>区域中
<a name="logoAnchor"> </a>
<div id="logo" style="position:absolute;visibility:visible;">
<img name="logoIm" src="../img/logo.gif" width=468 heith=60>
</div>
<SCRIPT LANGUAGE="JavaScript1.2">
<!-- Begin
function BrowserCheck() {
var b = navigator.appName;
if (b == "Netscape") this.b = "NS";
else if (b == "Microsoft Internet Explorer") this.b = "IE";
else this.b = b;
this.v = parseInt(navigator.appVersion);
this.NS = (this.b == "NS" && this.v >= 4);
this.NS4 = (this.b == "NS" && this.v == 4);
this.NS5 = (this.b == "NS" && this.v == 5);
this.IE = (this.b == "IE" && this.v >= 4);
this.IE4 = (navigator.userAgent.indexOf('MSIE 4') > 0);
this.IE5 = (navigator.userAgent.indexOf('MSIE 5') > 0);
if (this.IE5 || this.NS5) this.VER5 = true;
if (this.IE4 || this.NS4) this.VER4 = true;
this.oldVer = (! this.VER5 && ! this.VER4) ? true : false;
this.min = (this.NS || this.IE);
}
is = new BrowserCheck()
var myLogo = (is.NS4) ? document.layers["logo"] : document.all["logo"].style;
var logoWidth = (is.NS4) ? document.logo.document.logoIm.width : document.logoIm.width;
var logoHeight = (is.NS4) ? document.logo.document.logoIm.height : document.logoIm.height;
var halfHeight = logoHeight / 2;
var windowWidth = (is.NS4) ? window.innerWidth - 16 : document.body.offsetWidth - 20;
var halfWidth = logoWidth / 2;
var cliplogoHeightor = (is.NS4) ?
'myLogo.clip.top = 0;' +
'myLogo.clip.right = right;' +
'myLogo.clip.bottom = logoHeight;' +
'myLogo.clip.left = left; '
:
'str="rect(0 " + right + " " + logoHeight + " " + left + ")";' +
'myLogo.clip = str; '
var clipLogoVert = (is.NS4) ?
'myLogo.clip.top = up;' +
'myLogo.clip.right = logoWidth;' +
'myLogo.clip.bottom = dn;' +
'myLogo.clip.left = 0; '
:
'str="rect(" + up + " " + logoWidth + " " + dn + " 0)";' +
'myLogo.clip = str;'
var right = logoWidth, left = 0;
var cnt = 0, up = halfHeight, dn = halfHeight, upDown;
var logoWidth, logoHeight;
// --------------- User modifiable variables ----------------------
//if useAnchorPosition is true logo will be positioned where you put the "logoAnchor"
//set to false to center logo - also set myLogo.top to desired position
var useAnchorPosition = false; // set to false to set your own logo position below
if (! useAnchorPosition) {
myLogo.left = ((windowWidth / 2) - (logoWidth / 2)); // centers logo - comment out if using line below
//myLogo.left = 100; // remove '//' to set left position
myLogo.top = 200; // sets logo top
}
var scrollInc = 5; // sets # of pixels to scroll in 1 time frame
var scrollSpeed = 10; // sets the scroll speed
// ------------------------------------------------------------------
function scrollLogo() {
if (cnt == 0) {
up-- ; dn++;
if (up < -10) {
right = logoWidth;
left = 0;
upDown = -scrollInc;
cnt++;
}
eval(clipLogoVert);
}
if (cnt == 1) {
right += upDown;
left -= upDown;
if (right < halfWidth-40) {
right = halfWidth;
left = halfWidth;
upDown = scrollInc;
cnt++;
}
eval(cliplogoHeightor);
}
if (cnt == 2) {
right += upDown;
left -= upDown;
if (right > logoWidth+20) {
right = logoWidth;
left = 0;
up = 0;
dn = logoHeight;
cnt++;
}
eval(cliplogoHeightor);
}
if (cnt == 3) {
up++;
dn--;
if (dn < halfHeight - 10) {
up = halfHeight;
dn = halfHeight;
right = logoWidth;
left = 0;
upDown = scrollInc;
cnt = 0;
}
eval(clipLogoVert)
}
setTimeout("scrollLogo()", scrollSpeed);
}
if (! is.oldVer)window.onload = init;
function init() {
positionLogo();
scrollLogo();
}
var L, T;
var pos = (is.NS4) ? pos = document.anchors['logoAnchor'] : document.all['logoAnchor'];
var posStr = (is.NS4) ? 'L = pos.x ; T = pos.y' : 'L = pos.offsetLeft; T = pos.offsetTop';
function positionLogo() {
if (! useAnchorPosition) return;
eval(posStr);
myLogo.top = T;
myLogo.left = L;
}
// End -->
</script>⌨️ 快捷键说明
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