撞壁的弹球（飞飞鱼）

『更新时间：2006-4-1 』『字体：变小变大』『作者：未知 | 来源：网络』

把如下代码加入<body>区域中:
<HTML><HEAD><TITLE>撞壁的弹球</TITLE>
<META content="text/html; charset=gb2312" http-equiv=Content-Type>
<SCRIPT>
<!--

var x,y
var marginbottom
var marginleft=0
var margintop=0
var marginright

// 速度，越小越快
var tempo=200

// 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 = "http://51js.1000box.net/pics/face/24.gif";

img1 = new Image();
img1.src = "http://51js.1000box.net/pics/face/24.gif";

img2 = new Image();
img2.src = "http://51js.1000box.net/pics/face/24.gif";

img3 = new Image();
img3.src = "http://51js.1000box.net/pics/face/24.gif";

// 延迟两秒开始运动
function setValues() {
    var firsttimer= setTimeout("setValues2()",2000)
}

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="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx >= 0 && stepy <=0) {ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx <= 0 && stepy >=0) {ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx >= 0 && stepy >=0) {ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
    }
    
    if (document.layers) {
        if (stepx <= 0 && stepy <=0) {document.ball.document.ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx >= 0 && stepy <=0) {document.ball.document.ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx <= 0 && stepy >=0) {document.ball.document.ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
        if (stepx >= 0 && stepy >=0) {document.ball.document.ballimage.src="http://51js.1000box.net/pics/face/24.gif"}
    }
}

// -->
</SCRIPT>

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撞壁的弹球（飞飞鱼）

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