HTML代码：
第一版HTML：(非事件委托版)
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>菜单和详细显示隐藏</title> <style type="text/css"> * { margin: 0; padding: 0; font-family: "5FAE8F6F96C59ED1", Helvetica, sans-serif; font-size: 12px; } .box { position: relative; margin: 20px auto; width: 140px; height: 40px; line-height: 40px; text-align: center; border: 1px solid #999; background: #fff; } .box .boxDel { display: none; position: absolute; right: -1px; top: 40px; width: 310px; height: 70px; border: 1px solid #999; } .box span { display: block; position: absolute; top: 0; left: 0; width: 140px; height: 40px; background: #fff; } .box.bg span { height: 41px; border-bottom-color: #fff; } </style> </head> <body> <div class="box bg" id="box"> <div class="boxDel" id="boxDel">购物车详细信息</div> <span>我的购物车</span> </div> <script charset="UTF-8" type="text/javascript" src="js/utils.min.js"></script> <script type="text/javascript"> var box = document.getElementById("box"),boxDel = document.getElementById("boxDel"); box.onmouseenter =function(){ utils.addClass(this,"bg"); utils.css(boxDel,"display","block"); }; box.onmouseleave =function(){ utils.removeClass(this,"bg"); utils.css(boxDel,"display","none"); }; </script> </body> </html>
第二版HTML(事件委托版)
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>菜单和详细显示隐藏</title> <style type="text/css"> * { margin: 0; padding: 0; font-family: "5FAE8F6F96C59ED1", Helvetica, sans-serif; font-size: 12px; } html, body { width: 100%; height: 100%; overflow: hidden; } .box { position: absolute; top: 20px; right: 200px; z-index: 10; width: 140px; height: 40px; line-height: 40px; text-align: center; border: 1px solid #999; background: #fff; } .boxDel { display: none; position: absolute; top: 60px; right: 200px; width: 310px; height: 70px; border: 1px solid #999; background: #fff; } .box.bg { border-bottom-color: #fff; } </style> </head> <body> <div class="box" id="box"> 我的购物车 </div> <div class="boxDel" id="boxDel">购物车详细信息</div> <script charset="UTF-8" type="text/javascript" src="js/utils.min.js"></script> <script type="text/javascript"> var box = document.getElementById("box"),boxDel = document.getElementById("boxDel"); boxDel.onmouseover=function(e){ e = e || window.event; e.stopPropagation ? e.stopPropagation() : e.cancelBubble = true; }; document.body.onmouseover=function(e){ e = e || window.event; var curTar = e.target || e.srcElement; if(curTar.id ==="box"){ utils.addClass(curTar,"bg"); utils.css(boxDel,"display","block"); return; } //->剩下的就是隐藏 utils.removeClass(box, "bg"); utils.css(boxDel, "display", "none"); }; </script> </body> </html>
以上两版的HTML所引进的JS:(也就是utils.js加密版)
var utils=function(){function listToArray(a){var b,c;if(flag)return Array.prototype.slice.call(a,0);for(b=[],c=0;c<a.length;c++)b[b.length]=a[c];return b}function formatJSON(jsonStr){return"JSON"in window?JSON.parse(jsonStr):eval("("+jsonStr+")")}function offset(a){for(var b=a.offsetLeft,c=a.offsetTop,d=a.offsetParent;d;)-1===navigator.userAgent.indexOf("MSIE 8")&&(b+=d.clientLeft,c+=d.clientTop),b+=d.offsetLeft,c+=d.offsetTop,d=d.offsetParent;return{left:b,top:c}}function win(a,b){return"undefined"==typeof b?document.documentElement[a]||document.body[a]:(document.documentElement[a]=b,document.body[a]=b,void 0)}function children(a,b){var d,e,f,g,h,i,c=[];if(flag)c=this.listToArray(a.children);else{for(d=a.childNodes,e=0,f=d.length;f>e;e++)g=d[e],1===g.nodeType?c[c.length]=g:null;d=null}if("string"==typeof b)for(h=0;h<c.length;h++)i=c[h],i.nodeName.toLowerCase()!==b.toLowerCase()&&(c.splice(h,1),h--);return c}function prev(a){if(flag)return a.previousElementSibling;for(var b=a.previousSibling;b&&1!==b.nodeType;)b=b.previousSibling;return b}function next(a){if(flag)return a.nextElementSibling;for(var b=a.nextSibling;b&&1!==b.nodeType;)b=b.nextSibling;return b}function prevAll(a){for(var b=[],c=this.prev(a);c;)b.unshift(c),c=this.prev(c);return b}function nextAll(a){for(var b=[],c=this.next(a);c;)b.push(c),c=this.next(c);return b}function sibling(a){var b=this.prev(a),c=this.next(a),d=[];return b?d.push(b):null,c?d.push(c):null,d}function siblings(a){return this.prevAll(a).concat(this.nextAll(a))}function index(a){return this.prevAll(a).length}function firstChild(a){var b=this.children(a);return b.length>0?b[0]:null}function lastChild(a){var b=this.children(a);return b.length>0?b[b.length-1]:null}function append(a,b){b.appendChild(a)}function prepend(a,b){var c=this.firstChild(b);return c?(b.insertBefore(a,c),void 0):(b.appendChild(a),void 0)}function insertBefore(a,b){b.parentNode.insertBefore(a,b)}function insertAfter(a,b){var c=this.next(b);return c?(b.parentNode.insertBefore(a,c),void 0):(b.parentNode.appendChild(a),void 0)}function hasClass(a,b){var c=new RegExp("(^| +)"+b+"( +|$)");return c.test(a.className)}function addClass(a,b){var d,e,f,c=b.replace(/(^ +| +$)/g,"").split(/ +/g);for(d=0,e=c.length;e>d;d++)f=c[d],this.hasClass(a,f)||(a.className+=" "+f)}function removeClass(a,b){var d,e,f,g,c=b.replace(/(^ +| +$)/g,"").split(/ +/g);for(d=0,e=c.length;e>d;d++)f=c[d],this.hasClass(a,f)&&(g=new RegExp("(^| +)"+f+"( +|$)","g"),a.className=a.className.replace(g," "))}function getElementsByClass(a,b){var c,d,e,f,g,h,i,j,k;if(b=b||document,flag)return this.listToArray(b.getElementsByClassName(a));for(c=[],d=a.replace(/(^ +| +$)/g,"").split(/ +/g),e=b.getElementsByTagName("*"),f=0,g=e.length;g>f;f++){for(h=e[f],i=!0,j=0;j<d.length;j++)if(k=new RegExp("(^| +)"+d[j]+"( +|$)"),!k.test(h.className)){i=!1;break}i&&(c[c.length]=h)}return c}function getCss(a){var b=null,c=null;return flag?b=window.getComputedStyle(this,null)[a]:"opacity"===a?(b=this.currentStyle["filter"],c=/^alpha(opacity=(d+(?:.d+)?))$/,b=c.test(b)?c.exec(b)[1]/100:1):b=this.currentStyle[a],c=/^(-?d+(.d+)?)(px|pt|em|rem)?$/,c.test(b)?parseFloat(b):b}function setCss(a,b){if("float"===a)return this["style"]["cssFloat"]=b,this["style"]["styleFloat"]=b,void 0;if("opacity"===a)return this["style"]["opacity"]=b,this["style"]["filter"]="alpha(opacity="+100*b+")",void 0;var c=/^(width|height|top|bottom|left|right|((margin|padding)(Top|Bottom|Left|Right)?))$/;c.test(a)&&(isNaN(b)||(b+="px")),this["style"][a]=b}function setGroupCss(a){for(var b in a)a.hasOwnProperty(b)&&setCss.call(this,b,a[b])}function css(a){var b=arguments[1],c=Array.prototype.slice.call(arguments,1);if("string"==typeof b){if("undefined"==typeof arguments[2])return getCss.apply(a,c);setCss.apply(a,c)}b=b||0,"[object Object]"===b.toString()&&setGroupCss.apply(a,c)}var flag="getComputedStyle"in window;return{win:win,offset:offset,listToArray:listToArray,formatJSON:formatJSON,children:children,prev:prev,next:next,prevAll:prevAll,nextAll:nextAll,sibling:sibling,siblings:siblings,index:index,firstChild:firstChild,lastChild:lastChild,append:append,prepend:prepend,insertBefore:insertBefore,insertAfter:insertAfter,hasClass:hasClass,addClass:addClass,removeClass:removeClass,getElementsByClass:getElementsByClass,css:css}}();