Example of ajax asynchronous encapsulation function implemented in native javascript-PHP开发-php.cn

Example of ajax asynchronous encapsulation function implemented in native javascript

高洛峰

Release： 2016-12-07 16:55:28

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The example in this article describes the asynchronous encapsulation function of ajax implemented by native javascript. Share it with everyone for your reference, the details are as follows:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<script type="text/javascript" src="Scripts/jquery.js"></script>
</head>
<style>
* { margin: 0px; padding: 0px; }
#box { float: left; width: 500px; }
#left { float: left; background: #090; width: 100px; height: 100px; }
#right { background: #C60; width: 100px; height: 100px; float: left; }
#box2 { width: 180px; height: 100px; }
html>body #box2 { width: auto; height: auto; min-width: 180px; min-height: 100px; }
</style>
<body>
<p id="box">
 <p id="left">点击我 看效果！</p>
 <p id="right">fffeeee</p>
</p>
<p style="width:100px; height:100px; background:#969; float:left;" id="dd">dddd</p>
<script>
// 异步请求封装 IE6即以上浏览器
// ajax(url,fnSucc,selectID,fnFaild)
//url 请求地址
//fnSucc 异步请求后的内容处理函数
//fnFaild 请求失败处理函数
function ajax(url,fnSucc,fnFaild)
{
    //1.创建Ajax对象
    //非IE6
    var oAjax;
    if(window.XMLHttpRequest)//不会报错，只会是undefined
     {oAjax=new XMLHttpRequest();}
    else
    //iE6 IE5
     {oAjax=new ActiveXObject("Microsoft.XMLHTTP");}
    //alert(oAjax);
    //2.连接服务器
    //open(方法,文件名,异步传输)
    oAjax.open("get",url,true);//制止缓存
    //3.发送请求
    oAjax.send();
    //4.接收返回值 和服务器通讯的时候此事件发生
    oAjax.onreadystatechange=function()
    {
     //oAjax.readyState //浏览器和服务器，进行到哪一步了 异步握手过程
     if(oAjax.readyState==4)//读取完成（可能文件不存在）
     {
      if(oAjax.status==200 || oAjax.status==304)//请求成功 304即使浏览器缓存了也返回数据
      {
       fnSucc(oAjax.responseText);
       //alert("成功"+oAjax.responseText);
      }
      else
      {
       if(fnFaild)//fnFaild传进来时
       {
        fnFaild(oAjax.status);
       }
       //alert("失败:"+oAjax.status);//status为404
      }
     }
    }
}
window.onload=function(){
  var oBtn=document.getElementById("left");
  oBtn.onclick=function()
  {
      ajax("http://28967904.jsp.jspee.cn/ext/singlePage/list/json-1-1-20",function(str){
        var da= JSON.parse(str); //JSON数据解析
        alert(da.totalRow)
        },function(erorr){
          console.log(&#39;请求出错：&#39;+erorr);
        })
  }
}
</script>
</body>
</html>

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