124、天体运行规律

124、天体运行规律

脚本说明:

第一步:把如下代码加入<body>区域中

<SCRIPT language=JavaScript>

function DynLayer(id,nestref,frame) {

       if (!is.ns5 && !DynLayer.set && !frame) DynLayerInit()

       this.frame = frame || self

       if (is.ns) {

              if (is.ns4) {

                     if (!frame) {

                            if (!nestref) var nestref = DynLayer.nestRefArray[id]

                            if (!DynLayerTest(id,nestref)) return

                            this.css = (nestref)? eval("document."+nestref+".document."+id) : document.layers[id]

                     }

                     else this.css = (nestref)? eval("frame.document."+nestref+".document."+id) : frame.document.layers[id]

                     this.elm = this.event = this.css

                     this.doc = this.css.document

              }

              else if (is.ns5) {

                     this.elm = document.getElementById(id)

                     this.css = this.elm.style

                     this.doc = document

              }

              this.x = this.css.left

              this.y = this.css.top

              this.w = this.css.clip.width

              this.h = this.css.clip.height

       }

       else if (is.ie) {

              this.elm = this.event = this.frame.document.all[id]

              this.css = this.frame.document.all[id].style

              this.doc = document

              this.x = this.elm.offsetLeft

              this.y = this.elm.offsetTop

              this.w = (is.ie4)? this.css.pixelWidth : this.elm.offsetWidth

              this.h = (is.ie4)? this.css.pixelHeight : this.elm.offsetHeight

       }

       this.id = id

       this.nestref = nestref

       this.obj = id + "DynLayer"

       eval(this.obj + "=this")

}

function DynLayerMoveTo(x,y) {

       if (x!=null) {

              this.x = x

              if (is.ns) this.css.left = this.x

              else this.css.pixelLeft = this.x

       }

       if (y!=null) {

              this.y = y

              if (is.ns) this.css.top = this.y

              else this.css.pixelTop = this.y

       }

}

function DynLayerMoveBy(x,y) {

       this.moveTo(this.x+x,this.y+y)

}

function DynLayerShow() {

       this.css.visibility = (is.ns4)? "show" : "visible"

}

function DynLayerHide() {

       this.css.visibility = (is.ns4)? "hide" : "hidden"

}

DynLayer.prototype.moveTo = DynLayerMoveTo

DynLayer.prototype.moveBy = DynLayerMoveBy

DynLayer.prototype.show = DynLayerShow

DynLayer.prototype.hide = DynLayerHide

DynLayerTest = new Function('return true')

 

// DynLayerInit Function

function DynLayerInit(nestref) {

       if (!DynLayer.set) DynLayer.set = true

       if (is.ns) {

              if (nestref) ref = eval('document.'+nestref+'.document')

              else {nestref = ''; ref = document;}

              for (var i=0; i<ref.layers.length; i++) {

                     var divname = ref.layers[i].name

                     DynLayer.nestRefArray[divname] = nestref

                     var index = divname.indexOf("Div")

                     if (index > 0) {

                            eval(divname.substr(0,index)+' = new DynLayer("'+divname+'","'+nestref+'")')

                     }

                     if (ref.layers[i].document.layers.length > 0) {

                            DynLayer.refArray[DynLayer.refArray.length] = (nestref=='')? ref.layers[i].name : nestref+'.document.'+ref.layers[i].name

                     }

              }

              if (DynLayer.refArray.i < DynLayer.refArray.length) {

                     DynLayerInit(DynLayer.refArray[DynLayer.refArray.i++])

              }

       }

       else if (is.ie) {

              for (var i=0; i<document.all.tags("DIV").length; i++) {

                     var divname = document.all.tags("DIV")[i].id

                     var index = divname.indexOf("Div")

                     if (index > 0) {

                            eval(divname.substr(0,index)+' = new DynLayer("'+divname+'")')

                     }

              }

       }

       return true

}

DynLayer.nestRefArray = new Array()

DynLayer.refArray = new Array()

DynLayer.refArray.i = 0

DynLayer.set = false

 

// Slide Methods

function DynLayerSlideTo(endx,endy,inc,speed,fn) {

       if (endx==null) endx = this.x

       if (endy==null) endy = this.y

       var distx = endx-this.x

       var disty = endy-this.y

       this.slideStart(endx,endy,distx,disty,inc,speed,fn)

}

function DynLayerSlideBy(distx,disty,inc,speed,fn) {

       var endx = this.x + distx

       var endy = this.y + disty

       this.slideStart(endx,endy,distx,disty,inc,speed,fn)

}

function DynLayerSlideStart(endx,endy,distx,disty,inc,speed,fn) {

       if (this.slideActive) return

       if (!inc) inc = 10

       if (!speed) speed = 20

       var num = Math.sqrt(Math.pow(distx,2) + Math.pow(disty,2))/inc

       if (num==0) return

       var dx = distx/num

       var dy = disty/num

       if (!fn) fn = null

       this.slideActive = true

       this.slide(dx,dy,endx,endy,num,1,speed,fn)

}

function DynLayerSlide(dx,dy,endx,endy,num,i,speed,fn) {

       if (!this.slideActive) return

       if (i++ < num) {

              this.moveBy(dx,dy)

              this.onSlide()

              if (this.slideActive) setTimeout(this.obj+".slide("+dx+","+dy+","+endx+","+endy+","+num+","+i+","+speed+",\""+fn+"\")",speed)

              else this.onSlideEnd()

       }

       else {

              this.slideActive = false

              this.moveTo(endx,endy)

              this.onSlide()

              this.onSlideEnd()

              eval(fn)

       }

}

function DynLayerSlideInit() {}

DynLayer.prototype.slideInit = DynLayerSlideInit

DynLayer.prototype.slideTo = DynLayerSlideTo

DynLayer.prototype.slideBy = DynLayerSlideBy

DynLayer.prototype.slideStart = DynLayerSlideStart

DynLayer.prototype.slide = DynLayerSlide

DynLayer.prototype.onSlide = new Function()

DynLayer.prototype.onSlideEnd = new Function()

 

// Clip Methods

function DynLayerClipInit(clipTop,clipRight,clipBottom,clipLeft) {

       if (is.ie) {

              if (arguments.length==4) this.clipTo(clipTop,clipRight,clipBottom,clipLeft)

              else if (is.ie4) this.clipTo(0,this.css.pixelWidth,this.css.pixelHeight,0)

       }

}

function DynLayerClipTo(t,r,b,l) {

       if (t==null) t = this.clipValues('t')

       if (r==null) r = this.clipValues('r')

       if (b==null) b = this.clipValues('b')

       if (l==null) l = this.clipValues('l')

       if (is.ns) {

              this.css.clip.top = t

              this.css.clip.right = r

              this.css.clip.bottom = b

              this.css.clip.left = l

       }

       else if (is.ie) this.css.clip = "rect("+t+"px "+r+"px "+b+"px "+l+"px)"

}

function DynLayerClipBy(t,r,b,l) {

       this.clipTo(this.clipValues('t')+t,this.clipValues('r')+r,this.clipValues('b')+b,this.clipValues('l')+l)

}

function DynLayerClipValues(which) {

       if (is.ie) var clipv = this.css.clip.split("rect(")[1].split(")")[0].split("px")

       if (which=="t") return (is.ns)? this.css.clip.top : Number(clipv[0])

       if (which=="r") return (is.ns)? this.css.clip.right : Number(clipv[1])

       if (which=="b") return (is.ns)? this.css.clip.bottom : Number(clipv[2])

       if (which=="l") return (is.ns)? this.css.clip.left : Number(clipv[3])

}

DynLayer.prototype.clipInit = DynLayerClipInit

DynLayer.prototype.clipTo = DynLayerClipTo

DynLayer.prototype.clipBy = DynLayerClipBy

DynLayer.prototype.clipValues = DynLayerClipValues

 

// Write Method

function DynLayerWrite(html) {

       if (is.ns) {

              this.doc.open()

              this.doc.write(html)

              this.doc.close()

       }

       else if (is.ie) {

              this.event.innerHTML = html

       }

}

DynLayer.prototype.write = DynLayerWrite

 

// BrowserCheck Object

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.version = navigator.appVersion

       this.v = parseInt(this.version)

       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 = (this.version.indexOf('MSIE 4')>0)

       this.ie5 = (this.version.indexOf('MSIE 5')>0)

       this.min = (this.ns||this.ie)

}

is = new BrowserCheck()

 

// CSS Function

function css(id,left,top,width,height,color,vis,z,other) {

       if (id=="START") return '<STYLE TYPE="text/css">\n'

       else if (id=="END") return '</STYLE>'

       var str = (left!=null && top!=null)? '#'+id+' {position:absolute; left:'+left+'px; top:'+top+'px;' : '#'+id+' {position:relative;'

       if (arguments.length>=4 && width!=null) str += ' width:'+width+'px;'

       if (arguments.length>=5 && height!=null) {

              str += ' height:'+height+'px;'

              if (arguments.length<9 || other.indexOf('clip')==-1) str += ' clip:rect(0px '+width+'px '+height+'px 0px);'

       }

       if (arguments.length>=6 && color!=null) str += (is.ns)? ' layer-background-color:'+color+';' : ' background-color:'+color+';'

       if (arguments.length>=7 && vis!=null) str += ' visibility:'+vis+';'

       if (arguments.length>=8 && z!=null) str += ' z-index:'+z+';'

       if (arguments.length==9 && other!=null) str += ' '+other

       str += '}\n'

       return str

}

function writeCSS(str,showAlert) {

       str = css('START')+str+css('END')

       document.write(str)

       if (showAlert) alert(str)

}

 

</SCRIPT>

 

<SCRIPT language=JavaScript>

function Circle(dynlayer,name) {

       this.dynlayer = dynlayer

       this.name = name

       this.play = CirclePlay

       this.slide = CircleSlide

       this.pause = CirclePause

       this.stop = CircleStop

}

function CirclePlay(radius,angleinc,angle,endangle,speed,fn) {

       if (this.active) return

       if (!this.paused) {

              this.radius = radius

              this.angleinc = angleinc

              this.angle = angle

              this.endangle = endangle

              this.speed = speed

              this.fn = fn

              this.centerX = eval(this.dynlayer+'.x') - this.radius*Math.cos(this.angle*Math.PI/180)

              this.centerY = eval(this.dynlayer+'.y') + this.radius*Math.sin(this.angle*Math.PI/180)

              if (this.endangle!=null) {

                     this.angleinc = Math.abs(this.angleinc)

                     if (this.endangle<this.angle) this.angleinc *= -1

              }

       }

       this.active = true

       this.paused = false

       eval(this.dynlayer+'.'+this.name+'.slide()')

}

function CircleSlide() {

       if (this.active && (this.endangle==null || Math.abs(this.angleinc)<Math.abs(this.endangle-this.angle))) {

              this.angle += this.angleinc

              var x = this.centerX + this.radius*Math.cos(this.angle*Math.PI/180)

              var y = this.centerY - this.radius*Math.sin(this.angle*Math.PI/180)

              eval(this.dynlayer+'.moveTo('+x+','+y+')')

              setTimeout(this.dynlayer+'.'+this.name+'.slide()',this.speed)

       }

       else {

              if (this.endangle!=null) {

                     var x = Math.round(this.centerX + this.radius*Math.cos(this.endangle*Math.PI/180))

                     var y = Math.round(this.centerY - this.radius*Math.sin(this.endangle*Math.PI/180))

                     eval(this.dynlayer+'.moveTo('+x+','+y+')')

              }

              if (!this.paused) {

                     this.active = false

                     eval(this.fn)

              }

       }

}

function CirclePause() {

       if (this.active) {

              this.active = false

              this.paused = true

       }

}

function CircleStop() {

       this.active = false

       this.paused = false

}

 

</SCRIPT>

 

<SCRIPT language=JavaScript>

<!--

 

function init() {

earth = new DynLayer("earthDiv")

earth.circle = new Circle("earth","circle")

moon = new DynLayer("moonDiv")

moon.circle = new Circle("moon","circle")

earth.circle.play(125,1.5,0,null,20)

moon.circle.play(40,4,0,null,20)

}

//-->

</SCRIPT>

 

 

<DIV id=sun

style="LEFT: 214px; WIDTH: 71px; POSITION: absolute; TOP: 174px"><IMG height=71

src="sun.gif" width=71 border=0> </DIV>

<DIV id=earthDiv

style="LEFT: 325px; WIDTH: 100px; POSITION: absolute; TOP: 160px; HEIGHT: 100px">

<DIV id=earthImg

style="LEFT: 34px; WIDTH: 32px; POSITION: absolute; TOP: 34px; HEIGHT: 32px"><IMG

height=32 src="earth.gif" width=32 border=0> </DIV>

<DIV id=moonDiv

style="LEFT: 80px; WIDTH: 20px; POSITION: absolute; TOP: 40px; HEIGHT: 20px"><IMG

height=20 src="moon.gif" width=20 border=0> </DIV></DIV>

 

 

 

 

第二步:把<body>中的内容改为:

<body  background=stars.gif onload=init()>

 

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