要完成此效果需要两个步骤 第一步：把如下代码加入到区域中

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<script language=JavaScript></script> <script> var defaultbg="ffffff"; // Dynamic Layer Object // sophisticated layer/element targeting and animation object which provides the core functionality needed in most DHTML applications // 19990326 // Copyright (C) 1999 Dan Steinman // Distributed under the terms of the GNU Library General Public License // Available at http://www.dansteinman.com/dynduo/ // BrowserCheck Object // provides browser checking variables var px; var py; 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() // DynLayer Constructor function DynLayer(id,nestref,frame) { if (!DynLayer.set && !frame) DynLayerInit() if (is.ns) { if (is.ns) { if (!frame) { if (!nestref) var nestref = DynLayer.nestRefArray[id] if (DynLayer.useTest && !DynLayerTest(id,nestref)) return this.css = (nestref)? eval("document."+nestref+".document."+id) : document.layers[id] } else this.css = (nestref)? eval("parent."+frame+".document."+nestref+".document."+id) : parent.frames[frame].document.layers[id] this.elm = this.event = this.css this.doc = this.css.document } 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 = (frame)? parent.frames[frame].document.all[id] : document.all[id] this.css = (frame)? parent.frames[frame].document.all[id].style : 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.obj = id + "DynLayer" eval(this.obj + "=this") this.moveTo = DynLayerMoveTo this.moveBy = DynLayerMoveBy this.show = DynLayerShow this.hide = DynLayerHide this.slideInit = DynLayerSlideInit this.clipInit = DynLayerClipInit this.write = DynLayerWrite } // DynLayer Core Methods (moveTo, moveBy, hide, show) 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.ns)? "show" : "visible" } function DynLayerHide() { this.css.visibility = (is.ns)? "hide" : "hidden" } // DynLayer Slide Methods (optional) // straight line animation methods function DynLayerSlideInit() { this.slideTo = DynLayerSlideTo this.slideBy = DynLayerSlideBy this.slideStart = DynLayerSlideStart this.slide = DynLayerSlide this.onSlide = new Function("") this.onSlideEnd = new Function("") } 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) } } // DynLayer Clip Methods (optional) // provides layer clipping functionality function DynLayerClipInit(clipTop,clipRight,clipBottom,clipLeft) { this.clipTo = DynLayerClipTo this.clipBy = DynLayerClipBy this.clipValues = DynLayerClipValues 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 Write Method (optional) // rewrites the contents of the layer function DynLayerWrite(html) { if (is.ns) { this.doc.open() this.doc.write(html) this.doc.close() } else if (is.ie) { this.event.innerHTML = html } } // DynLayerTest Function (optional - disable with DynLayer.useTest=false) // makes sure the layer target is correct before assigning the DynLayer, outputs useful info if incorrect function DynLayerTest(id,nestref) { var ref = new Array() if (nestref) ref = nestref.split('.document.') ref[ref.length] = id var refstr = (is.ns)? 'document.'+ref[0] : 'document.all.'+ref[0] for (var i=1; i<=ref.length; i++) { if (eval(refstr)) { if (ref.length==i) return true else refstr += (is.ns)? '.document.'+ref[i] : '.all.'+ref[i] } else { var str ='DynLayer Error:' for (j in ref) { str += '\n'+ref[j] if (j==i-1) str += ' <-- this layer cannot be found' } if (DynLayerTest.count++<5) alert(str) else alert("Too many DynLayer errors, quitting.") return false } } return false } DynLayerTest.count = 0 // DynLayerInit // automatically retrieves nested heirarchy of the layer and defines DynLayers named with "Div" 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 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 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 DynLayer.useTest = true // CSS function (optional) // returns CSS syntax for generated layers function css(id,left,top,width,height,color,vis,z,other) { if (id=="START") return '' 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) } //css(id,left,top,width,height,color,vis,z,other) if (is.ns){ x=-10; y=-23;} else if(is.ie5){ x=-1; y=-42;} else {x=0;y=0;} writeCSS( css('bgcDiv',x+10,y+160,53,40,defaultbg,1,8) + css('RDiv', x+65,y+160,256,9,null,1,1) + css('RpointDiv',x+65,y+169,12,8,null,1,2) + css('GDiv', x+65,y+180,256,9,null,1,3) + css('GpointDiv',x+65,y+189,12,8,null,1,4) + css('BDiv', x+65,y+200,256,9,null,1,5) + css('BpointDiv',x+65,y+209,12,8,null,1,6) ) var gcurr; var Display; function xch(g) { document.setform[g + "x"].value = document.setform[g + "x"].value.toUpperCase(); if (g == gcurr) { use(g); } return true; } function initialize(bgc) { document.setform.bgx.value = bgc; return true; } function myclip() { var c = h2d(document.setform[gcurr + "x"].value); var cr = (c >> 16) & 255, cg = (c >> 8) & 255, cb = (c) & 255; R.clipTo(null,cr,null,null); G.clipTo(null,cg,null,null); B.clipTo(null,cb,null,null); Rpoint.moveTo(R.x-5+cr,null); Gpoint.moveTo(G.x-5+cg,null); Bpoint.moveTo(B.x-5+cb,null); } function use(g) { gcurr = g; Display = window[gcurr + "c"]; var c = h2d(document.setform[gcurr + "x"].value); var cr = (c >> 16) & 255, cg = (c >> 8) & 255, cb = (c) & 255; change(cr, cg, cb); myclip(); return true; } function change(r, g, b) { document.setform.rd.value = r; document.setform.gd.value = g; document.setform.bd.value = b; document.setform[gcurr + "x"].value = convertToHex(r, g, b); Display.css.backgroundColor = convertToHex(r, g, b); Display.css.bgColor = convertToHex(r, g, b); return true; } function h2d(s) { var r = 0; var index = "0123456789ABCDEF"; s = s.toUpperCase(); for (var i = 0; i < s.length; i++) { r <<= 4; r += index.indexOf(s.substr(i, 1)); } return r; } function convertToHex(R, G, B) { var Hex = "0123456789ABCDEF"; return "" + Hex.substr(R >> 4, 1) + Hex.substr(R & 15, 1) + Hex.substr(G >> 4, 1) + Hex.substr(G & 15, 1) + Hex.substr(B >> 4, 1) + Hex.substr(B & 15, 1); } function pcolor(form) { form.bgcolor.value = h2d(form.bgx.value); return true; } function init() { DynLayerInit() initialize(defaultbg); var c = h2d(document.setform.bgx.value); Rc.value = (c >> 16) & 255; Gc.value = (c >> 8) & 255; Bc.value = (c) & 255; defaultRvalue = Rc.value; defaultGvalue = Gc.value; defaultBvalue = Bc.value; R.clipInit(0,defaultRvalue,10,0) R.dragActive = false G.clipInit(0,defaultGvalue,10,0) G.dragActive = false B.clipInit(0,defaultBvalue,10,0) B.dragActive = false R.clipTo(null,defaultRvalue+1,null,null) G.clipTo(null,defaultGvalue+1,null,null) B.clipTo(null,defaultBvalue+1,null,null) Rpoint.moveTo(R.x-5+defaultRvalue,null) Gpoint.moveTo(G.x-5+defaultGvalue,null) Bpoint.moveTo(B.x-5+defaultBvalue,null) use("bg"); Display.css.backgroundColor = convertToHex(defaultRvalue, defaultGvalue, defaultBvalue) Display.css.bgColor = convertToHex(defaultRvalue, defaultGvalue, defaultBvalue) document.onmousedown = mouseDown document.onmousemove = mouseMove document.onmouseup = mouseUp if (is.ns) document.captureEvents(Event.MOUSEDOWN | Event.MOUSEMOVE | Event.MOUSEUP) } function mouseDown(e) { if ((is.ns && e.which!=1) || (is.ie && event.button!=1)) return true var x = (is.ns)? e.pageX : event.x+document.body.scrollLeft var y = (is.ns)? e.pageY : event.y+document.body.scrollTop if (x>=R.x && x<=R.x+R.w && y>=R.y && y<=R.y+R.h+10) { R.clipTo(null,x-R.x,null,null) if ( x >= R.x + R.w ) { RpointX = R.w + R.x - 6 Rc.value = RpointX + 6 - R.x -1 } else if ( x <= R.x ) { RpointX = R.x - 6 Rc.value = RpointX + 6 - R.x } else { RpointX = x - 6 Rc.value = RpointX + 6 - R.x } Rpoint.moveTo(RpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) R.dragOffsetX = x-R.x R.dragOffsetY = y-R.y R.dragActive = true return false } else if (x>=G.x && x<=G.x+G.w && y>=G.y && y<=G.y+G.h+10) { G.clipTo(null,x-G.x,null,null) if ( x >= G.x + G.w ) { GpointX = G.w + G.x - 6 Gc.value = GpointX + 6 - G.x -1 } else if ( x <= G.x ) { GpointX = G.x - 6 Gc.value = GpointX + 6 - G.x } else { GpointX = x - 6 Gc.value = GpointX + 6 - G.x } Gpoint.moveTo(GpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) G.dragOffsetX = x-G.x G.dragOffsetY = y-G.y G.dragActive = true return false } else if (x>=B.x && x<=B.x+B.w && y>=B.y && y<=B.y+B.h+10) { B.clipTo(null,x-B.x,null,null) if ( x >= B.x + B.w ) { BpointX = B.w + B.x - 6 Bc.value = BpointX + 6 - B.x -1 } else if ( x <= B.x ) { BpointX = B.x - 6 Bc.value = BpointX + 6 - B.x } else { BpointX = x - 6 Bc.value = BpointX + 6 - B.x } Bpoint.moveTo(BpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) B.dragOffsetX = x-B.x B.dragOffsetY = y-B.y B.dragActive = true return false } else return true } function mouseMove(e) { var x = (is.ns)? e.pageX : event.x+document.body.scrollLeft var y = (is.ns)? e.pageY : event.y+document.body.scrollTop if (R.dragActive) { R.clipTo(null,x-R.x,null,null) if ( x >= R.x + R.w ) { RpointX = R.w + R.x - 6 Rc.value = RpointX + 6 - R.x -1 } else if ( x <= R.x ) { RpointX = R.x - 6 Rc.value = RpointX + 6 - R.x } else { RpointX = x - 6 Rc.value = RpointX + 6 - R.x } Rpoint.moveTo(RpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) return false } else if (G.dragActive) { G.clipTo(null,x-G.x,null,null) if ( x >= G.x + G.w ) { GpointX = G.w + G.x - 6 Gc.value = GpointX + 6 - G.x -1 } else if ( x <= G.x ) { GpointX = G.x - 6 Gc.value = GpointX + 6 - G.x } else { GpointX = x - 6 Gc.value = GpointX + 6 - G.x } Gpoint.moveTo(GpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) return false } else if (B.dragActive) { B.clipTo(null,x-B.x,null,null) if ( x >= B.x + B.w ) { BpointX = B.w + B.x - 6 Bc.value = BpointX + 6 - B.x -1 } else if ( x <= B.x ) { BpointX = B.x - 6 Bc.value = BpointX + 6 - B.x } else { BpointX = x - 6 Bc.value = BpointX + 6 - B.x } Bpoint.moveTo(BpointX,null) Display.css.backgroundColor = convertToHex(Rc.value, Gc.value, Bc.value) Display.css.bgColor = convertToHex(Rc.value, Gc.value, Bc.value) return false } else return true } function mouseUp(e) { var x = (is.ns)? e.pageX : event.x+document.body.scrollLeft var y = (is.ns)? e.pageY : event.y+document.body.scrollTop R.dragActive = false G.dragActive = false B.dragActive = false change(Rc.value, Gc.value, Bc.value); return true } </script> 第二步：把“onload="init();"”加在标记里 例如：