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實現(xiàn)一個拖動的全代碼：

運行代碼框
<STYLE>LI { MARGIN-BOTTOM: 10px } OL { MARGIN-TOP: 5px } .DragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BACKGROUND-COLOR: #eee } .DragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .DragDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .miniDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { FILTER: alpha(opacity=50); BACKGROUND-COLOR: #ff99cc } LEGEND { FONT-WEIGHT: bold; FONT-SIZE: 12px; COLOR: #666699; FONT-FAMILY: verdana, tahoma, arial } FIELDSET { PADDING-RIGHT: 3px; PADDING-LEFT: 3px; PADDING-BOTTOM: 3px; PADDING-TOP: 3px } .History { FONT-SIZE: 10px; OVERFLOW: auto; WIDTH: 100%; FONT-FAMILY: verdana, tahoma, arial; HEIGHT: 82px } #DragContainer8 { BORDER-RIGHT: #669999 1px solid; PADDING-RIGHT: 0px; BORDER-TOP: #669999 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 0px; BORDER-LEFT: #669999 1px solid; WIDTH: 110px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 1px solid; HEIGHT: 110px } .miniDragBox { FLOAT: left; MARGIN: 0px 5px 5px 0px; WIDTH: 20px; HEIGHT: 20px } pre{border:1 solid #CCC;background-color:#F8F8F0;padding:10px;} </STYLE> <script> // iMouseDown represents the current mouse button state: up or down /* lMouseState represents the previous mouse button state so that we can check for button clicks and button releases: if(iMouseDown && !lMouseState) // button just clicked! if(!iMouseDown && lMouseState) // button just released! */ var mouseOffset = null; var iMouseDown = false; var lMouseState = false; var dragObject = null; // Demo 0 variables var DragDrops = []; var curTarget = null; var lastTarget = null; var dragHelper = null; var tempDiv = null; var rootParent = null; var rootSibling = null; Number.prototype.NaN0=function(){return isNaN(this)?0:this;} function CreateDragContainer(){ /* Create a new "Container Instance" so that items from one "Set" can not be dragged into items from another "Set" */ var cDrag = DragDrops.length; DragDrops[cDrag] = []; /* Each item passed to this function should be a "container". Store each of these items in our current container */ for(var i=0; i<arguments.length; i++){ var cObj = arguments[i]; DragDrops[cDrag].push(cObj); cObj.setAttribute('DropObj', cDrag); /* Every top level item in these containers should be draggable. Do this by setting the DragObj attribute on each item and then later checking this attribute in the mouseMove function */ for(var j=0; j<cObj.childNodes.length; j++){ // Firefox puts in lots of #text nodes...skip these if(cObj.childNodes[j].nodeName=='#text') continue; cObj.childNodes[j].setAttribute('DragObj', cDrag); } } } function mouseCoords(ev){ if(ev.pageX || ev.pageY){ return {x:ev.pageX, y:ev.pageY}; } return { x:ev.clientX + document.body.scrollLeft - document.body.clientLeft, y:ev.clientY + document.body.scrollTop - document.body.clientTop }; } function getMouseOffset(target, ev){ ev = ev || window.event; var docPos = getPosition(target); var mousePos = mouseCoords(ev); return {x:mousePos.x - docPos.x, y:mousePos.y - docPos.y}; } function getPosition(e){ var left = 0; var top = 0; while (e.offsetParent){ left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0); top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0); e = e.offsetParent; } left += e.offsetLeft + (e.currentStyle?(parseInt(e.currentStyle.borderLeftWidth)).NaN0():0); top += e.offsetTop + (e.currentStyle?(parseInt(e.currentStyle.borderTopWidth)).NaN0():0); return {x:left, y:top}; } function mouseMove(ev){ ev = ev || window.event; /* We are setting target to whatever item the mouse is currently on Firefox uses event.target here, MSIE uses event.srcElement */ var target = ev.target || ev.srcElement; var mousePos = mouseCoords(ev); // mouseOut event - fires if the item the mouse is on has changed if(lastTarget && (target!==lastTarget)){ // reset the classname for the target element var origClass = lastTarget.getAttribute('origClass'); if(origClass) lastTarget.className = origClass; } /* dragObj is the grouping our item is in (set from the createDragContainer function). if the item is not in a grouping we ignore it since it can't be dragged with this script. */ var dragObj = target.getAttribute('DragObj'); // if the mouse was moved over an element that is draggable if(dragObj!=null){ // mouseOver event - Change the item's class if necessary if(target!=lastTarget){ var oClass = target.getAttribute('overClass'); if(oClass){ target.setAttribute('origClass', target.className); target.className = oClass; } } // if the user is just starting to drag the element if(iMouseDown && !lMouseState){ // mouseDown target curTarget = target; // Record the mouse x and y offset for the element rootParent = curTarget.parentNode; rootSibling = curTarget.nextSibling; mouseOffset = getMouseOffset(target, ev); // We remove anything that is in our dragHelper DIV so we can put a new item in it. for(var i=0; i<dragHelper.childNodes.length; i++) dragHelper.removeChild(dragHelper.childNodes[i]); // Make a copy of the current item and put it in our drag helper. dragHelper.appendChild(curTarget.cloneNode(true)); dragHelper.style.display = 'block'; // set the class on our helper DIV if necessary var dragClass = curTarget.getAttribute('dragClass'); if(dragClass){ dragHelper.firstChild.className = dragClass; } // disable dragging from our helper DIV (it's already being dragged) dragHelper.firstChild.removeAttribute('DragObj'); /* Record the current position of all drag/drop targets related to the element. We do this here so that we do not have to do it on the general mouse move event which fires when the mouse moves even 1 pixel. If we don't do this here the script would run much slower. */ var dragConts = DragDrops[dragObj]; /* first record the width/height of our drag item. Then hide it since it is going to (potentially) be moved out of its parent. */ curTarget.setAttribute('startWidth', parseInt(curTarget.offsetWidth)); curTarget.setAttribute('startHeight', parseInt(curTarget.offsetHeight)); curTarget.style.display = 'none'; // loop through each possible drop container for(var i=0; i<dragConts.length; i++){ with(dragConts[i]){ var pos = getPosition(dragConts[i]); /* save the width, height and position of each container. Even though we are saving the width and height of each container back to the container this is much faster because we are saving the number and do not have to run through any calculations again. Also, offsetHeight and offsetWidth are both fairly slow. You would never normally notice any performance hit from these two functions but our code is going to be running hundreds of times each second so every little bit helps! Note that the biggest performance gain here, by far, comes from not having to run through the getPosition function hundreds of times. */ setAttribute('startWidth', parseInt(offsetWidth)); setAttribute('startHeight', parseInt(offsetHeight)); setAttribute('startLeft', pos.x); setAttribute('startTop', pos.y); } // loop through each child element of each container for(var j=0; j<dragConts[i].childNodes.length; j++){ with(dragConts[i].childNodes[j]){ if((nodeName=='#text') || (dragConts[i].childNodes[j]==curTarget)) continue; var pos = getPosition(dragConts[i].childNodes[j]); // save the width, height and position of each element setAttribute('startWidth', parseInt(offsetWidth)); setAttribute('startHeight', parseInt(offsetHeight)); setAttribute('startLeft', pos.x); setAttribute('startTop', pos.y); } } } } } // If we get in here we are dragging something if(curTarget){ // move our helper div to wherever the mouse is (adjusted by mouseOffset) dragHelper.style.top = mousePos.y - mouseOffset.y; dragHelper.style.left = mousePos.x - mouseOffset.x; var dragConts = DragDrops[curTarget.getAttribute('DragObj')]; var activeCont = null; var xPos = mousePos.x - mouseOffset.x + (parseInt(curTarget.getAttribute('startWidth')) /2); var yPos = mousePos.y - mouseOffset.y + (parseInt(curTarget.getAttribute('startHeight'))/2); // check each drop container to see if our target object is "inside" the container for(var i=0; i<dragConts.length; i++){ with(dragConts[i]){ if(((getAttribute('startLeft')) < xPos) && ((getAttribute('startTop')) < yPos) && ((getAttribute('startLeft') + getAttribute('startWidth')) > xPos) && ((getAttribute('startTop') + getAttribute('startHeight')) > yPos)){ /* our target is inside of our container so save the container into the activeCont variable and then exit the loop since we no longer need to check the rest of the containers */ activeCont = dragConts[i]; // exit the for loop break; } } } // Our target object is in one of our containers. Check to see where our div belongs if(activeCont){ // beforeNode will hold the first node AFTER where our div belongs var beforeNode = null; // loop through each child node (skipping text nodes). for(var i=activeCont.childNodes.length-1; i>=0; i--){ with(activeCont.childNodes[i]){ if(nodeName=='#text') continue; // if the current item is "After" the item being dragged if( curTarget != activeCont.childNodes[i] && ((getAttribute('startLeft') + getAttribute('startWidth')) > xPos) && ((getAttribute('startTop') + getAttribute('startHeight')) > yPos)){ beforeNode = activeCont.childNodes[i]; } } } // the item being dragged belongs before another item if(beforeNode){ if(beforeNode!=curTarget.nextSibling){ activeCont.insertBefore(curTarget, beforeNode); } // the item being dragged belongs at the end of the current container } else { if((curTarget.nextSibling) || (curTarget.parentNode!=activeCont)){ activeCont.appendChild(curTarget); } } // make our drag item visible if(curTarget.style.display!=''){ curTarget.style.display = ''; } } else { // our drag item is not in a container, so hide it. if(curTarget.style.display!='none'){ curTarget.style.display = 'none'; } } } // track the current mouse state so we can compare against it next time lMouseState = iMouseDown; // mouseMove target lastTarget = target; // track the current mouse state so we can compare against it next time lMouseState = iMouseDown; // this helps prevent items on the page from being highlighted while dragging return false; } function mouseUp(ev){ if(curTarget){ // hide our helper object - it is no longer needed dragHelper.style.display = 'none'; // if the drag item is invisible put it back where it was before moving it if(curTarget.style.display == 'none'){ if(rootSibling){ rootParent.insertBefore(curTarget, rootSibling); } else { rootParent.appendChild(curTarget); } } // make sure the drag item is visible curTarget.style.display = ''; } curTarget = null; iMouseDown = false; } function mouseDown(){ iMouseDown = true; if(lastTarget){ return false; } } document.onmousemove = mouseMove; document.onmousedown = mouseDown; document.onmouseup = mouseUp; window.onload = function(){ // Create our helper object that will show the item while dragging dragHelper = document.createElement('DIV'); dragHelper.style.cssText = 'position:absolute;display:none;'; CreateDragContainer( document.getElementById('DragContainer1'), document.getElementById('DragContainer2'), document.getElementById('DragContainer3') ); document.body.appendChild(dragHelper); } </script> <!--the mouse over and dragging class are defined on each item--> <div class="DragContainer" id="DragContainer1"> <div class="DragBox" id="Item1" overClass="OverDragBox" dragClass="DragDragBox">Item #1</div> <div class="DragBox" id="Item2" overClass="OverDragBox" dragClass="DragDragBox">Item #2</div> <div class="DragBox" id="Item3" overClass="OverDragBox" dragClass="DragDragBox">Item #3</div> <div class="DragBox" id="Item4" overClass="OverDragBox" dragClass="DragDragBox">Item #4</div> </div> <div class="DragContainer" id="DragContainer2"> <div class="DragBox" id="Item5" overClass="OverDragBox" dragClass="DragDragBox">Item #5</div> <div class="DragBox" id="Item6" overClass="OverDragBox" dragClass="DragDragBox">Item #6</div> <div class="DragBox" id="Item7" overClass="OverDragBox" dragClass="DragDragBox">Item #7</div> <div class="DragBox" id="Item8" overClass="OverDragBox" dragClass="DragDragBox">Item #8</div> </div> <div class="DragContainer" id="DragContainer3"> <div class="DragBox" id="Item9" overClass="OverDragBox" dragClass="DragDragBox">Item #9</div> <div class="DragBox" id="Item10" overClass="OverDragBox" dragClass="DragDragBox">Item #10</div> <div class="DragBox" id="Item11" overClass="OverDragBox" dragClass="DragDragBox">Item #11</div> <div class="DragBox" id="Item12" overClass="OverDragBox" dragClass="DragDragBox">Item #12</div>
[Ctrl+A 全部選擇 提示：你可先修改部分代碼，再按運行]

你現(xiàn)在擁有了拖拽的所有東西．

下面的三個demo是記錄事件歷史．當你的鼠標在item上移動，將記錄所生的事件，如果你不明白可以嘗試一下鼠標的劃過或者拖動，看有什么發(fā)生．

運行代碼框
<SCRIPT src="/articleimg/2006/07/3791/drag_drop.js" type=text/javascript></SCRIPT> <STYLE type=text/css>LI { MARGIN-BOTTOM: 10px } OL { MARGIN-TOP: 5px } .DragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BORDER-RIGHT: #669999 2px solid; PADDING-RIGHT: 5px; BORDER-TOP: #669999 2px solid; PADDING-LEFT: 5px; FLOAT: left; PADDING-BOTTOM: 0px; MARGIN: 3px; BORDER-LEFT: #669999 2px solid; WIDTH: 100px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 2px solid } .OverDragContainer { BACKGROUND-COLOR: #eee } .DragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .DragDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .miniDragBox { BORDER-RIGHT: #000 1px solid; PADDING-RIGHT: 2px; BORDER-TOP: #000 1px solid; PADDING-LEFT: 2px; FONT-SIZE: 10px; MARGIN-BOTTOM: 5px; PADDING-BOTTOM: 2px; BORDER-LEFT: #000 1px solid; WIDTH: 94px; CURSOR: pointer; PADDING-TOP: 2px; BORDER-BOTTOM: #000 1px solid; FONT-FAMILY: verdana, tahoma, arial; BACKGROUND-COLOR: #eee } .OverDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { BACKGROUND-COLOR: #ffff99 } .DragDragBox { FILTER: alpha(opacity=50); BACKGROUND-COLOR: #ff99cc } LEGEND { FONT-WEIGHT: bold; FONT-SIZE: 12px; COLOR: #666699; FONT-FAMILY: verdana, tahoma, arial } FIELDSET { PADDING-RIGHT: 3px; PADDING-LEFT: 3px; PADDING-BOTTOM: 3px; PADDING-TOP: 3px } .History { FONT-SIZE: 10px; OVERFLOW: auto; WIDTH: 100%; FONT-FAMILY: verdana, tahoma, arial; HEIGHT: 82px } #DragContainer8 { BORDER-RIGHT: #669999 1px solid; PADDING-RIGHT: 0px; BORDER-TOP: #669999 1px solid; PADDING-LEFT: 5px; PADDING-BOTTOM: 0px; BORDER-LEFT: #669999 1px solid; WIDTH: 110px; PADDING-TOP: 5px; BORDER-BOTTOM: #669999 1px solid; HEIGHT: 110px } .miniDragBox { FLOAT: left; MARGIN: 0px 5px 5px 0px; WIDTH: 20px; HEIGHT: 20px } PRE { BORDER-RIGHT: #ccc 1px solid; PADDING-RIGHT: 10px; BORDER-TOP: #ccc 1px solid; PADDING-LEFT: 10px; PADDING-BOTTOM: 10px; BORDER-LEFT: #ccc 1px solid; PADDING-TOP: 10px; BORDER-BOTTOM: #ccc 1px solid; BACKGROUND-COLOR: #f8f8f0 } </STYLE> <body> <FIELDSET id=Demo0> <H3>Demo - Drag and Drop any item</H3> <DIV> <DIV class=DragContainer id=DragContainer1 overclass="OverDragContainer" history="History1"> <DIV class=DragBox id=Item1 overclass="OverDragBox" dragclass="DragDragBox">Item #1</DIV> <DIV class=DragBox id=Item2 overclass="OverDragBox" dragclass="DragDragBox">Item #2</DIV> <DIV class=DragBox id=Item3 overclass="OverDragBox" dragclass="DragDragBox">Item #3</DIV> <DIV class=DragBox id=Item4 overclass="OverDragBox" dragclass="DragDragBox">Item #4</DIV></DIV> <DIV class=DragContainer id=DragContainer2 overclass="OverDragContainer" history="History1"> <DIV class=DragBox id=Item5 overclass="OverDragBox" dragclass="DragDragBox">Item #5</DIV> <DIV class=DragBox id=Item6 overclass="OverDragBox" dragclass="DragDragBox">Item #6</DIV> <DIV class=DragBox id=Item7 overclass="OverDragBox" dragclass="DragDragBox">Item #7</DIV> <DIV class=DragBox id=Item8 overclass="OverDragBox" dragclass="DragDragBox">Item #8</DIV></DIV> <DIV class=DragContainer id=DragContainer3 overclass="OverDragContainer" history="History1"> <DIV class=DragBox id=Item9 overclass="OverDragBox" dragclass="DragDragBox">Item #9</DIV> <DIV class=DragBox id=Item10 overclass="OverDragBox" dragclass="DragDragBox">Item #10</DIV> <DIV class=DragBox id=Item11 overclass="OverDragBox" dragclass="DragDragBox">Item #11</DIV> <DIV class=DragBox id=Item12 overclass="OverDragBox" dragclass="DragDragBox">Item #12</DIV></DIV> <FIELDSET><LEGEND>History</LEGEND> <DIV class=History id=History1></DIV></FIELDSET> </DIV></FIELDSET> <FIELDSET id=Demo7><LEGEND>Demo - Drag and Drop any item</LEGEND> <DIV> <OL id=DragContainer7 history="History1"> <LI id=ListItem1>Item #1 <LI id=ListItem2>Item #2 <LI id=ListItem3>Item #3 <LI id=ListItem4>Item #4 <LI id=ListItem5>Item #5 </LI></OL></DIV></FIELDSET> <FIELDSET id=Demo8> <H3>Demo - Drag and Drop any item</H3> <DIV id=DragContainer8 history="History1"> <DIV class=miniDragBox id=MiniBox1>1</DIV> <DIV class=miniDragBox id=MiniBox2>2</DIV> <DIV class=miniDragBox id=MiniBox3>3</DIV> <DIV class=miniDragBox id=MiniBox4>4</DIV> <DIV class=miniDragBox id=MiniBox5>5</DIV> <DIV class=miniDragBox id=MiniBox6>6</DIV> <DIV class=miniDragBox id=MiniBox7>7</DIV> <DIV class=miniDragBox id=MiniBox8>8</DIV> <DIV class=miniDragBox id=MiniBox9>9</DIV> <DIV class=miniDragBox id=MiniBox10>10</DIV> <DIV class=miniDragBox id=MiniBox11>11</DIV> <DIV class=miniDragBox id=MiniBox12>12</DIV> <DIV class=miniDragBox id=MiniBox13>13</DIV> <DIV class=miniDragBox id=MiniBox14>14</DIV> <DIV class=miniDragBox id=MiniBox15>15</DIV> <DIV class=miniDragBox id=MiniBox16>16</DIV></DIV></FIELDSET> <DIV></DIV> </body> </html>
[Ctrl+A 全部選擇 提示：你可先修改部分代碼，再按運行]

關(guān)于譯者：
雪山老人，lamp程序員，web開發(fā)者，你可以訪問sohotx.com來了解他！

關(guān)于作者：
Mark Kahn是一個web開發(fā)者與DBA.你可以訪問他的主頁聯(lián)系他！

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