<!DOCTYPE html> 
<html> 
<head> 
 <meta charset="UTF-8"> 
 <title>一個(gè)基于面向?qū)ο蟮姆猪摻M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> 
 //分頁組件類 
 function Paging(container,opt){ 
 //自定義事件 
 this.eventHandlers={}; 
 //默認(rèn)設(shè)置 
 this.config={ 
  nowNum: 1, 
  allNum: 10, 
  callback: function(){} 
 } 
 if(opt){ 
  this.extend(this.config,opt); 
 } 
 //外層容器 
 this.Box= null; 
 //渲染組件 
 this.render(container); 
 } 
 Paging.prototype={ 
 constructor: Paging, 
 /*綁定自定義事件*/ 
 on: function(eventType,eventHandler){ 
  if(typeof this.eventHandlers[eventType] === 'undefined'){ 
  this.eventHandlers[eventType]= []; 
  } 
  this.eventHandlers[eventType].push(eventHandler); 
 }, 
 /*觸發(fā)自定義事件*/ 
 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結(jié)構(gòu)*/ 
 renderUI: function(){ 
  this.Box= document.createElement('div'); 
  this.Box.className= 'Paging'; 
  var nowNum= this.config.nowNum; 
  var allNum= this.config.allNum; 
  //當(dāng)前頁大于或等于4，第一頁才能隱藏，總數(shù)大于5才能顯示首頁 
  if (nowNum >=4 && allNum >=6) { 
  var pageA= document.createElement('a'); 
  pageA.className= 'Paging-item Paging-item-start' 
  pageA.href='#1'; 
  pageA.innerHTML= '首頁'; 
  this.Box.appendChild(pageA); 
  }; 
  //當(dāng)前頁只要不是第一頁就顯示上一頁 
  if(nowNum>=2){ 
  var pageA= document.createElement('a'); 
  pageA.className= 'Paging-item Paging-item-pre' 
  pageA.href='#'+ (nowNum-1); 
  pageA.innerHTML= '上一頁'; 
  this.Box.appendChild(pageA); 
  } 
  
  //只有5頁時(shí) 
  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); 
   //對(duì)當(dāng)前頁為前2頁的處理 
   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; 
   } 
   }/*對(duì)當(dāng)前頁為后2頁的處理*/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= '下一頁'; 
  this.Box.appendChild(pageA); 
  } 
  //選擇7為標(biāo)準(zhǔn)，或7以下才能顯示 
  if((allNum-nowNum) >= 3 && allNum >= 6){ 
  var pageA= document.createElement('a'); 
  pageA.className= 'Paging-item Paging-item-end' 
  pageA.href='#'+allNum; 
  pageA.innerHTML= '尾頁'; 
  this.Box.appendChild(pageA); 
  } 
  
  
 
 }, 
 /*為UI綁定事件*/ 
 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); 
  } 
 }, 
 /*繼承對(duì)象*/ 
 extend: function(obj1,obj2){ 
  for(attr in obj2){ 
  obj1[attr]= obj2[attr]; 
  } 
 } 
 } 
 //初始化調(diào)用 
 var page= new Paging(null,{ 
 nowNum: 1, 
 allNum: 10, 
 callback: function(nowNum,allNum){ 
  console.log('當(dāng)前頁：'+nowNum) 
  console.log('總頁：'+allNum) 
 } 
 }); 
</script> 
</html>

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