隨頁面上下移動

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隨頁面上下移動

註釋：放在<body>與</body>之間

<script language=JavaScript>
	self.onError=null;
	currentX = currentY = 0;  
	whichIt = null;           
	lastScrollX = 0; lastScrollY = 0;
	NS = (document.layers) ? 1 : 0;
	IE = (document.all) ? 1: 0;
	
	function heartBeat() {
		if(IE) { diffY = document.body.scrollTop; diffX = document.body.scrollLeft; }
	    if(NS) { diffY = self.pageYOffset; diffX = self.pageXOffset; }
		if(diffY != lastScrollY) {
	                percent = .1 * (diffY - lastScrollY);
	                if(percent > 0) percent = Math.ceil(percent);
	                else percent = Math.floor(percent);
					if(IE) document.all.floater.style.pixelTop += percent;
					if(NS) document.floater.top += percent; 
	                lastScrollY = lastScrollY + percent;
	    }
		if(diffX != lastScrollX) {
			percent = .1 * (diffX - lastScrollX);
			if(percent > 0) percent = Math.ceil(percent);
			else percent = Math.floor(percent);
			if(IE) document.all.floater.style.pixelLeft += percent;
			if(NS) document.floater.left += percent;
			lastScrollX = lastScrollX + percent;
		}	
	}
	
	
	function checkFocus(x,y) { 
	        stalkerx = document.floater.pageX;
	        stalkery = document.floater.pageY;
	        stalkerwidth = document.floater.clip.width;
	        stalkerheight = document.floater.clip.height;
	        if( (x > stalkerx && x < (stalkerx+stalkerwidth)) && (y > stalkery && y < (stalkery+stalkerheight))) return true;
	        else return false;
	}
	function grabIt(e) {
		if(IE) {
			whichIt = event.srcElement;
			while (whichIt.id.indexOf("floater") == -1) {
				whichIt = whichIt.parentElement;
				if (whichIt == null) { return true; }
		    }
			whichIt.style.pixelLeft = whichIt.offsetLeft;
		    whichIt.style.pixelTop = whichIt.offsetTop;
			currentX = (event.clientX + document.body.scrollLeft);
	   		currentY = (event.clientY + document.body.scrollTop); 	
		} else { 
	        window.captureEvents(Event.MOUSEMOVE);
	        if(checkFocus (e.pageX,e.pageY)) { 
	                whichIt = document.floater;
	                StalkerTouchedX = e.pageX-document.floater.pageX;
	                StalkerTouchedY = e.pageY-document.floater.pageY;
	        } 
		}
	    return true;
	}
	function moveIt(e) {
		if (whichIt == null) { return false; }
		if(IE) {
		    newX = (event.clientX + document.body.scrollLeft);
		    newY = (event.clientY + document.body.scrollTop);
		    distanceX = (newX - currentX);    distanceY = (newY - currentY);
		    currentX = newX;    currentY = newY;
		    whichIt.style.pixelLeft += distanceX;
		    whichIt.style.pixelTop += distanceY;
			if(whichIt.style.pixelTop < document.body.scrollTop) whichIt.style.pixelTop = document.body.scrollTop;
			if(whichIt.style.pixelLeft < document.body.scrollLeft) whichIt.style.pixelLeft = document.body.scrollLeft;
			if(whichIt.style.pixelLeft > document.body.offsetWidth - document.body.scrollLeft - whichIt.style.pixelWidth - 20) whichIt.style.pixelLeft = document.body.offsetWidth - whichIt.style.pixelWidth - 20;
			if(whichIt.style.pixelTop > document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5) whichIt.style.pixelTop = document.body.offsetHeight + document.body.scrollTop - whichIt.style.pixelHeight - 5;
			event.returnValue = false;
		} else { 
			whichIt.moveTo(e.pageX-StalkerTouchedX,e.pageY-StalkerTouchedY);
	        if(whichIt.left < 0+self.pageXOffset) whichIt.left = 0+self.pageXOffset;
	        if(whichIt.top < 0+self.pageYOffset) whichIt.top = 0+self.pageYOffset;
	        if( (whichIt.left + whichIt.clip.width) >= (window.innerWidth+self.pageXOffset-17)) whichIt.left = ((window.innerWidth+self.pageXOffset)-whichIt.clip.width)-17;
	        if( (whichIt.top + whichIt.clip.height) >= (window.innerHeight+self.pageYOffset-17)) whichIt.top = ((window.innerHeight+self.pageYOffset)-whichIt.clip.height)-17;
	        return false;
		}
	    return false;
	}
	function dropIt() {
		whichIt = null;
	    if(NS) window.releaseEvents (Event.MOUSEMOVE);
	    return true;
	}
	
	if(NS) {
		window.captureEvents(Event.MOUSEUP|Event.MOUSEDOWN);
		window.onmousedown = grabIt;
	 	window.onmousemove = moveIt;
		window.onmouseup = dropIt;
	}
	if(IE) {
		document.onmousedown = grabIt;
	 	document.onmousemove = moveIt;
		document.onmouseup = dropIt;
	}
	if(NS || IE) action = window.setInterval("heartBeat()",1);
</script>
      <div id="floater" style="position:absolute; width:94px; height:55px; z-index:10; left: 367px; top: 233px">將你的文字或圖片放在此處</div>

提示：將源代碼拷貝到頁面上之後，會在頁面上出現一個圖層，將你的內容放在圖層中即可，圖層的位置和大小可自定。

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