原生javascript实现分页效果

随着近几年前端行业的迅猛发展，各种层出不穷的新框架，新方法让我们有点眼花缭乱。

最近刚好比较清闲，所以没事准备撸撸前端的根基javascript,纯属练练手，写个分页，顺便跟大家分享一下

function pageFunc(conf){
 this.myFunc = conf.click //用户点击要执行的方法
 this.total = conf.total; //总页数
 this.currentPage = 1; //当前页码
 this.init()  //初始化 
}

pageFunc.prototype.init = function(){
 var total = this.total,
 currentPage = this.currentPage,
 _this = this;

 listeners = {
 'setWhat' : function(opts) {
  _this.aClick(opts.src)
  return false;
 }
 };

 listenersPre = {
 'lmw-pre' : function(opts) {
  _this.prevClick()
  return false;
 }
 };

 listenersAdd = {
 'lmw-add' : function(opts) {
  _this.addClick()
  return false;
 }
 };

 var rootele = this.createPage(1,total);
 document.getElementById('page-coat').innerHTML = rootele

 $on(document.getElementById('page-coat'), ['click'], listeners);//点击a标签
 $on(document.getElementById('page-coat'), ['click'], listenersPre);//点击上一页
 $on(document.getElementById('page-coat'), ['click'], listenersAdd);//点击下一页

}
//创建HTML分页结构字符串
pageFunc.prototype.createPage = function(page,total){
 var str = `<a class="lmw-current" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${page}</a>`
 for(var i=1;i<=3;i++){
 if(page-i>1){
  str = `<a attr-action="setWhat" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${page-i}</a>`+str
 }
 if(page+i<total){
  str = str+`<a attr-action="setWhat" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${(page+i)}</a>`
 }
 };
 if(page-4>1){
 str = '<span>...</span>'+str
 };
 if(page+4<total){
 str = str+'<span>...</span>'
 };
 if(page>1){
 str = `<a class="lmw-pre" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >上一页</a><a attr-action="setWhat" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >1</a>`+str
 };
 if(page<total){
 str = str+`<a attr-action="setWhat" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >${total}</a><a class="lmw-add" href="#" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >下一页</a>`
 };
 return str
}
//上一页方法
pageFunc.prototype.prevClick = function(){
 var total = this.total
 var va = --this.currentPage 
 var newret = this.createPage(va, total)
 document.getElementById('page-coat').innerHTML = newret
 this.myFunc(va) 
}
//下一页方法
pageFunc.prototype.addClick = function(){
 var total = this.total
 var va = ++this.currentPage
 var newret = this.createPage(va, total)
 document.getElementById('page-coat').innerHTML = newret 
 this.myFunc(va) 
};
//点击方法
pageFunc.prototype.aClick = function(_this){
 var total = this.total
 var va = parseInt(_this.innerText);
 this.currentPage = va
 var rootele = this.createPage(va, total)
 document.getElementById('page-coat').innerHTML = rootele
 this.myFunc(va) 
};


//二：封装事件代理方法
function $on(dom, event, listeners) {
 $addEvent(dom, event, function(e) {
 var e = e || window.event,
 src = e.target || e.srcElement,
 action,
 returnVal;
 
 while (src && src !== dom) {
 action = src.getAttribute('attr-action') || src.getAttribute('class') ;
 if (listeners[action]) {
 returnVal = listeners[action]({
 src : src,
 e : e,
 action : action
 });

 if (returnVal === false) {
 break;
 }
 }
 src = src.parentNode;
 }
 });
};
//1、封装跨浏览器事件绑定方法
function $addEvent(obj, type, handle) {
 if(!obj || !type || !handle) {
 return;
 }

 if( obj instanceof Array) {
 for(var i = 0, l = obj.length; i < l; i++) {
 $addEvent(obj[i], type, handle);
 }
 return;
 }

 if( type instanceof Array) {
 for(var i = 0, l = type.length; i < l; i++) {
 $addEvent(obj, type[i], handle);
 }
 return;
 }
//2、解决IE中this指向window的问题
 function createDelegate(handle, context) {
 return function() {
 return handle.apply(context, arguments);
 };
 }
 
 if(window.addEventListener) {
 var wrapper = createDelegate(handle, obj);
 obj.addEventListener(type, wrapper, false);
 }
 else if(window.attachEvent) {
 var wrapper = createDelegate(handle, obj);
 obj.attachEvent("on" + type, wrapper);
 }
 else {
 obj["on" + type] = handle;
 }
};

使用方法：

<!DOCTYPE HTML>
<html>
<head>
 <meta charset="UTF-8">
 <title>分页效果</title>
 <style type="text/css">
 #page-coat a{
  text-decoration:none; 
  display: inline;
  float: left;
  padding: 3px 10px 3px 10px; 
  overflow: hidden; 
  border:1px solid #ccc;
  color:#999;
  margin-right: 5px;
  cursor: pointer;
  background: #fff;
  
 }
 #page-coat a:hover{
  border: 1px solid #FF6600;
  background-color: #FF6600;
  color: #fff; 
 }
 #page-coat span{
  display: inline;
  float: left;
  color:#999;
  background: #fff;
 }
 #page-coat a.lmw-current{
  color: #FF6600;
  border: 1px solid #FF6600;
  background-color: #FFEEE5;
 }
 </style>
</head>
<body class="l-bg2">
 <div id="page-coat">
 
 </div> 
</body>
<script type="text/javascript" src="js/jquery-1.7.2.min.js"></script>
<script type="text/javascript" src="js/public.js"></script>
<script type="text/javascript">
var conf = {
 'total':100,
 'click':function(e){ //e为当前页码
/* $.get('/php',{"page":e},function(data){
  console.log('ok')
 })*/
 }
}
var page = new pageFunc(conf);
</script>
</html>

用原生还是比较麻烦的，为了实现业务，还得去封装一个模仿JQ的.on事件绑定方法。写的比较简陋，一些配置接口没有暴露出来，还可以再抽象暴露。

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。