原生JavaScript实现滚动到底部自动加载数据插件

核心代码示例

new downUpData({url:"http://192.168.1.103:8080/test/
data.json",distance:20,callback:function(resp,config){
 var oUl = document.getElementById('ul');
 for(var i=0;i<resp.data.length;i+=1){
 oUl.innerHTML+= '<li>'+ resp.data[i].title +'</li>';
 }
}}).isBottom();

<!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="UTF-8">
 <title>Document</title>
 <meta name="viewport" content="width=device-width, initial-scale=1">
 <style>
 body,ul{
  margin:0;
  padding:0;
 }
 </style>
</head>
<body>
 <ul id="ul">
 </ul>
 <script>
 function downUpData(obj){
  this.config = obj;
 };
 downUpData.prototype = {
  // 判断是否到达底部
  isBottom:function(){
  var _this = this;
  var scrollH = null,
   clientHeight = null;
   scrollTop = null;
   distance = this.config.distance||0;
   h = 0;
  function scroll(){
   scrollH = document.body.scrollHeight||document.documentElement.scrollHeight;
   clientHeight = window.innerHeight;
   scrollTop = document.body.scrollTop||document.documentElement.scrollTop;
   h = clientHeight + scrollTop;
   if(h>=scrollH-distance){
   _this.ajax();
   }
  }
  scroll();

  window.onscroll = function(){
   scroll();
  };
  },
  // 发送AJAX请求
  ajax:function(){
  var _this = this;
  var xhr = null;
  if(window.XMLHttpRequest){
   xhr = new XMLHttpRequest();
  }else{
   xhr = new ActiveXObject("Microsoft.XMLHTTP");
  }

  xhr.open("GET",this.config.url,true);
  xhr.onreadystatechange = function(){
   if(xhr.readyState==4&&xhr.status==200){
   _this.config.callback(JSON.parse(xhr.responseText),_this.config);
   }
  }
  xhr.send();
  }
 };

 new downUpData({url:"http://192.168.1.103:8080/test/data.json",distance:20,callback:function(resp,config){
  console.log(config)
  var oUl = document.getElementById('ul');
  for(var i=0;i<resp.data.length;i+=1){
  oUl.innerHTML+= '<li>'+ resp.data[i].title +'</li>';
  }
 }}).isBottom();
 </script>
</body>
</html>