网络时空 | 网页特效

特效说明

有一个显示区域在图片上来回移动，图片也时隐时现，很酷的

特

效

代

码

<body onload=setValues()>
<SCRIPT language=JavaScript>
<!-- Beginning of JavaScript -
var x,y
var marginbottom
var marginleft=0
var margintop=0
var marginright

var cliptop
var clipbottom
var clipleft
var clipright
var clippoints

var ballheight=150
var ballwidth=150

var imageheight=525
var imagewidth=457
									  
									   
// less is faster
var tempo=25

// horizontal move (pixels) within time unit
var stepx=12

// vertical move (pixels) within time unit
var stepy=6
var timer

// check the width and the height of the document
// gets the starting position of the ball by random
function setValues() {
	if (document.all) {
    	marginbottom = imageheight-ballheight
    	marginright = imagewidth-ballwidth
		document.all.ball.style.posLeft=randommaker(400)
   		document.all.ball.style.posTop=0
		document.all.textcontent.style.posLeft=0
   		document.all.textcontent.style.posTop=0
			document.all.ball.style.filter="alpha(opacity=0,finishopacity=100,style=2,startX=0px,startY=0px,finishX=100px,finishY=100px)"
    	moveball()
	}
}

// randomfunction
function randommaker(range) {		
	rand=Math.floor(range*Math.random())
    return rand
}

function moveball() {
	checkposition()
	if (document.all) {	
   		document.all.ball.style.posLeft+=stepx
   		document.all.ball.style.posTop+=stepy
		
		cliptop=document.all.ball.style.posTop
		clipbottom=cliptop+ballheight
		clipleft=document.all.ball.style.posLeft
		clipright=clipleft+ballwidth
		
		clippoints="rect("+cliptop+" "+clipright+" "+clipbottom+" "+clipleft+")"
		document.all.textcontent.style.clip=clippoints
    	timer=setTimeout("moveball()",tempo)
	}
}

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