本文實例講述了JS實現網站菜單拖拽移位效果的方法。分享給大家供大家參考。具體如下：
這是一個基于JavaScript的層手動實例，讓網站的菜單可以拖拽移位，記得土豆網的“豆單”有這種功能。本效果還尚未徹底完成，部分地方因沒有寫入對應內容，因此JS可能會提示有錯誤。
運行效果截圖如下：
在線演示地址如下：
http://demo.VeVB.COm/js/2015/js-web-menu-tzyw-style-codes/
具體代碼如下：
<html><head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>層拖動</title><style type="text/css">*{ margin:0; padding:0}li{ list-style:none}.wapper{ width:500px; margin:50px;height:auto; overflow:hidden; position:relative; border:1px #e6e6e6 solid}.wapper ol{ position:absolute;top:0; left:0}.wapper li{width:30px; height:32px; line-height:32px; padding:3px 0; text-align:center;}.wapper .m-li{ padding:3px 3px 3px 30px;height:32px;position:relative}.wapper .m-li div,.wapper .m-li-cur div{ line-height:30px; height:30px;background:#ECF3F9; border:1px #ccc solid; padding:0 0 0 16px;color:#316DA9; font-size:14px;cursor:move;}.wapper .m-li .m-sub-cur,.wapper .m-li-cur .m-sub-cur{opacity:0.35;filter:Alpha(opacity=35);}.wapper .m-li-cur{ padding:0 3px 3px 30px; border-top:3px #FFDAAD solid}.wapper .m-li-cur span{ padding:0 0 3px;}#tips{ position:absolute; top:0;left:0;cursor:move; z-index:2;display:none}#tips div{background:#FDFFDA;line-height:30px; height:30px;border:1px #ccc solid; padding:0 0 0 16px;color:#316DA9; font-size:14px;}</style></head><body><div class="wapper" id="box"><div class="m-wapper"><div class="m-li"><div class="m-sub">ASP源碼</div></div><div class="m-li"><div class="m-sub">PHP源碼</div></div><div class="m-li"><div class="m-sub">JSP源碼</div></div><div class="m-li"><div class="m-sub">JAVA源碼</div></div></div><ol id="m-num"></ol><div id="tips"></div></div><script type="text/javascript">document.getElementsByClassName=function(eleClassName){ var getEleClass = []; var myclass = new RegExp("http://b"+eleClassName+"http://b"); var elem = this.getElementsByTagName("*"); for(var h=0;h<elem.length;h++){ var classes = elem[h].className; if (myclass.test(classes)) getEleClass.push(elem[h]); } return getEleClass;}function $(o){ var t = document.getElementById(o); return t?t:false;}function hasClass(ele,cls) { return ele.className.match(new RegExp('(//s|^)'+cls+'(//s|$)'));}function addClass(ele,cls) { if (!this.hasClass(ele,cls)) ele.className += " "+cls;}function removeClass(ele,cls) { if (hasClass(ele,cls)) { var reg = new RegExp('(//s|^)'+cls+'(//s|$)'); ele.className=ele.className.replace(reg,' '); }}function getStyle(o,n){ return o.currentStyle?o.currentStyle[n]:(document.defaultView.getComputedStyle(o,"").getPropertyValue(n))}function f(){ var d=document; var mNum = document.getElementById("m-num"); var ols = document.getElementsByClassName("m-wapper")[0]; var lis = document.getElementsByClassName("m-li"); var divs = document.getElementsByClassName("m-sub"); var tips = document.getElementById("tips"); for(var i=0;i<divs.length;i++){ var mnumNode=document.createElement("li"); mNum.appendChild(mnumNode); mNum.getElementsByTagName("li")[i].innerHTML=i+1; divs[i].onmouseover=function(e){ show(this); } } function show(obj){ for(var i=0;i<divs.length;i++){ if(divs[i]==obj){ var voidNum=i; obj.onmousedown=function(e){ var cloneNode=obj.cloneNode(true);/*克隆節點*/ tips.appendChild(cloneNode); //alert(i) tips.style.width=obj.offsetWidth+"px"; tips.style.display="block"; //alert(voidNum); tips.style.top=(38*voidNum)+3+"px"; tips.style.left="30px" for(var j=0;j<divs.length;j++){ /*恢復行默認樣式*/ divs[j].className="m-sub"; } obj.className="m-sub-cur"; /*選中行添加新樣式*/ tips.onmouseover=function(e){ window.getSelection ? window.getSelection().removeAllRanges() : document.selection.empty();//清除選擇 e=e||event; /*鼠標定位*/ var x=e.clientY-tips.offsetTop; //var y=e.clientX-obj.offsetLeft; d.onmousemove=function(e){ e=e||event; var tipsTop = e.clientY-x; tips.style.top=tipsTop+"px"; if(tipsTop <= 3){ tips.style.top="3px"; } if(tipsTop >= (38*(i-1)+3)){ tips.style.top=38*(i-1)+3+"px"; } lisNum = Math.round((tipsTop-3)/38); if(lisNum>=i){ lisNum=i; } for(var n=0; n<divs.length; n++){ lis[n]["className"]="m-li"; lis[lisNum]["className"]="m-li-cur"; } //obj.style.left=e.clientX-y+"px"; } d.onmouseup = function(){ d.onmouseup=d.onmousemove=""; tips.style.display="none"; for(var n=0; n<lis.length; n++){ lis[n]["className"]="m-li"; } obj.className="m-sub"; var newNode=document.createElement("div"); var delNode=tips.getElementsByTagName("div")[0];/*清空節點*/ var delNode2=lis[voidNum];/*清空節點*/ newNode.appendChild(delNode); newNode.className="m-li"; ols.insertBefore(newNode,lis[lisNum]); ols.removeChild(delNode2); tips.removeChild(delNode); } } } } } }}f();</script></body></html>希望本文所述對大家的JavaScript程序設計有所幫助。
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