基于面向对象的分页组件

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文字表达有限，直接上代码了！

<!DOCTYPE html><html><head><meta charset="UTF-8"><title>一个基于面向对象的分页组件</title><style>html,body{padding:0;margin:0;}p{padding:0;margin:0;}a{text-decoration: none}.Paging{overflow: hidden;}.Paging-item{float: left;padding: 10px 15px;background: #4caf50;color: #fff;margin-left: 5px;}.Paging-item-active{background: #ff568e;}</style></head><body><div id="page"></div></body><script>//分页组件类function Paging(container,opt){//自定义事件this.eventHandlers={};//默认设置this.config={nowNum: 1,allNum: 10,callback: function(){}}if(opt){this.extend(this.config,opt);}//外层容器this.Box= null;//渲染组件this.render(container);}Paging.prototype={constructor: Paging,/*绑定自定义事件*/on: function(eventType,eventHandler){if(typeof this.eventHandlers[eventType] === 'undefined'){this.eventHandlers[eventType]= [];}this.eventHandlers[eventType].push(eventHandler);},/*触发自定义事件*/fire: function(eventType){if( this.eventHandlers[eventType] instanceof Array){var len= this.eventHandlers[eventType].length;for(var i=0;i<len;i++){this.eventHandlers[eventType][i]();}}},/*渲染UI结构*/renderUI: function(){this.Box= document.createElement('div');this.Box.className= 'Paging';var nowNum= this.config.nowNum;var allNum= this.config.allNum;//当前页大于或等于4，第一页才能隐藏，总数大于5才能显示首页if (nowNum >=4 && allNum >=6) {var pageA= document.createElement('a');pageA.className= 'Paging-item Paging-item-start'pageA.href='#1';pageA.innerHTML= '首页';this.Box.appendChild(pageA);};//当前页只要不是第一页就显示上一页if(nowNum>=2){var pageA= document.createElement('a');pageA.className= 'Paging-item Paging-item-pre'pageA.href='#'+ (nowNum-1);pageA.innerHTML= '上一页';this.Box.appendChild(pageA);}//只有5页时if(allNum<=5){for(var i=1;i<=allNum;i++){var pageA= document.createElement('a');pageA.className= 'Paging-item'pageA.href= '#'+ i;if(nowNum==i){pageA.className= 'Paging-item Paging-item-active'pageA.innerHTML=i;}else{// pageA.innerHTML='['+ i +']';pageA.innerHTML=i;}this.Box.appendChild(pageA);}}else{for(var i=1;i<=5;i++){var pageA= document.createElement('a');pageA.className= 'Paging-item'pageA.href= '#'+ (nowNum-3+i);//对当前页为前2页的处理if(nowNum === 1 || nowNum  === 2){pageA.href= '#'+ i;if(nowNum === i){pageA.className= 'Paging-item Paging-item-active'pageA.innerHTML= i;}else{// pageA.innerHTML= '['+i+']';pageA.innerHTML= i;}}/*对当前页为后2页的处理*/else if((allNum-nowNum) ===0 || (allNum-nowNum) === 1){/*==<a href="">[6]</a><a href="">[7]</a><a href="">[8]</a><a href="">[9]</a><a href="">10</a>==*/pageA.href= '#'+ ((allNum-5)+i);if((allNum-nowNum) ===0 && i===5){pageA.className= 'Paging-item Paging-item-active'pageA.innerHTML=((allNum-5)+i);}else if((allNum-nowNum) ===1 && i===4){pageA.className= 'Paging-item Paging-item-active'pageA.innerHTML=((allNum-5)+i);}else{// pageA.innerHTML= '['+ ((allNum-5)+i) +']'pageA.innerHTML= ((allNum-5)+i)}}else{if(nowNum === (nowNum-3+i)){pageA.className= 'Paging-item Paging-item-active'pageA.innerHTML= (nowNum-3+i);}else{// pageA.innerHTML= '['+ (nowNum-3+i) +']'pageA.innerHTML= (nowNum-3+i)}}this.Box.appendChild(pageA);}}if((allNum-nowNum) >=1){var pageA= document.createElement('a');pageA.className= 'Paging-item Paging-item-next'pageA.href='#'+ (nowNum+1);pageA.innerHTML= '下一页';this.Box.appendChild(pageA);}//选择7为标准，或7以下才能显示if((allNum-nowNum) >= 3 && allNum >= 6){var pageA= document.createElement('a');pageA.className= 'Paging-item Paging-item-end'pageA.href='#'+allNum;pageA.innerHTML= '尾页';this.Box.appendChild(pageA);}},/*为UI绑定事件*/bindUI: function(){var self= this;this.config.callback(this.config.nowNum,this.config.allNum);//利用事件委托self.Box.onclick= function(e){var e= e || window.event;var target= e.target || e.srcElement;if(typeof e.target.getAttribute('href') === 'string'){var nowNum= parseInt(target.getAttribute('href').substring(1));// console.log(nowNum);self.Box.innerHTML= '';new Paging(null,{nowNum: nowNum,allNum: self.config.allNum,callback: self.config.callback})}return false;}},/*渲染UI*/render: function(container){this.renderUI();this.bindUI();if(container){var con= document.getElementById(container);con.appendChild(this.Box);}else{document.body.appendChild(this.Box);}},/*继承对象*/extend: function(obj1,obj2){for(attr in obj2){obj1[attr]= obj2[attr];}}}//初始化调用var page= new Paging(null,{nowNum: 1,allNum: 10,callback: function(nowNum,allNum){console.log('当前页：'+nowNum)console.log('总页：'+allNum)}});</script></html>

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