网络时空 | 网页特效

特效说明

撞壁变色的弹性小球，这是个很酷的效果，一定不可错过

特

效

代

码

<body onload=setValues()>
<SCRIPT>
var x,y
var marginbottom
var marginleft=0
var margintop=0
var marginright

// 速度，越小越快
var tempo=60

// 单位时间内水平移动的距离
var stepx=20

// 单位时间内上下移动的距离
var stepy=20
var timer

// 图象的路径
img0 = new Image();
img0.src = "1602.gif";
img1 = new Image();
img1.src = "1603.gif";
img2 = new Image();
img2.src = "1604.gif";
img3 = new Image();
img3.src = "1605.gif";
// 延迟两秒开始运动
function setValues() {
var firsttimer= setTimeout("setValues2()",100)}

function setValues2() {
	if (document.all) {
	marginbottom = document.body.clientHeight-50
	marginright = document.body.clientWidth-50
		document.all.ball.style.posLeft=randommaker(marginright-30)+30
		document.all.ball.style.posTop=10
	moveball()
	}
	if (document.layers) {
	marginbottom = window.innerHeight-10
	marginright = window.innerWidth-10
		document.ball.left=randommaker(marginright-30)+30
		document.ball.top=10
	moveball()
	}
}

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

function moveball() {
	checkposition()
	chooseimage()
	if (document.all) {	
		document.all.ball.style.posLeft+=stepx
		document.all.ball.style.posTop+=stepy
	timer=setTimeout("moveball()",tempo)
	}
	if (document.layers) {
		document.ball.left+=stepx
		document.ball.top+=stepy
	timer=setTimeout("moveball()",tempo)
	}
}

function checkposition() {
	if (document.all) {
		if (document.all.ball.style.posLeft>=marginright) {
			stepx=stepx*-1
			document.all.ball.style.posLeft-=10
		}
		if (document.all.ball.style.posLeft<=marginleft) {
			stepx=stepx*-1
			document.all.ball.style.posLeft+=10
		}	
		if (document.all.ball.style.posTop>=marginbottom) {
			stepy=stepy*-1
			document.all.ball.style.posTop-=10
		}
		if (document.all.ball.style.posTop<=margintop) {
			stepy=stepy*-1
			document.all.ball.style.posTop+=10
		}
	}
	if (document.layers) {
		if (document.ball.left>=marginright) {
			stepx=stepx*-1
			document.ball.left-=10
		}
		if (document.ball.left<=marginleft) {
			stepx=stepx*-1
			document.ball.left+=10
		}	
		if (document.ball.top>=marginbottom) {
			stepy=stepy*-1
			document.ball.top-=10
		}
		if (document.ball.top<=margintop) {
			stepy=stepy*-1
			document.ball.top+=10
		}
	}
}

function chooseimage() {
	if (document.all) {
		if (stepx <= 0 && stepy <=0) {ballimage.src="1602.gif"}
		if (stepx >= 0 && stepy <=0) {ballimage.src="1603.gif"}
		if (stepx <= 0 && stepy >=0) {ballimage.src="1605.gif"}
		if (stepx >= 0 && stepy >=0) {ballimage.src="1604.gif"}
	}
	
	if (document.layers) {
		if (stepx <= 0 && stepy <=0) {document.ball.document.ballimage.src="1601.gif"}
		if (stepx >= 0 && stepy <=0) {document.ball.document.ballimage.src="1602.gif"}
		if (stepx <= 0 && stepy >=0) {document.ball.document.ballimage.src="1603.gif"}
if (stepx >= 0 && stepy >=0) {document.ball.document.ballimage.src="1604.gif"}}}
</SCRIPT>

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