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原生 JS Ajax,GET和POST 请求实例代码

admin

11月 28, 2021

javascript/js的ajax的GET请求代码如下所示:

<script type="text/javascript"> 
/* 创建 XMLHttpRequest 对象 */
var xmlHttp; 
function GetXmlHttpObject(){ 
  if (window.XMLHttpRequest){ 
    // code for IE7+, Firefox, Chrome, Opera, Safari 
    xmlhttp=new XMLHttpRequest(); 
  }else{// code for IE6, IE5 
    xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
  } 
  return xmlhttp; 
} 
// -----------ajax方法-----------// 
function getLabelsGet(){ 
  xmlHttp=GetXmlHttpObject(); 
  if (xmlHttp==null){ 
    alert('您的浏览器不支持AJAX!'); 
    return; 
  } 
  var id = document.getElementById('id').value; 
  var url="http://www.Leefrom.com?id="+id+"&t/"+Math.random(); 
  xmlHttp.open("GET",url,true); 
  xmlHttp.onreadystatechange=favorOK;//发送事件后,收到信息了调用函数 
  xmlHttp.send(); 
}
function getOkGet(){ 
  if(xmlHttp.readyState==1||xmlHttp.readyState==2||xmlHttp.readyState==3){ 
    // 本地提示:加载中 
  } 
  if (xmlHttp.readyState==4 && xmlHttp.status==200){ 
    var d= xmlHttp.responseText; 
    // 处理返回结果 
  } 
} 
</script>

  

javascript/js的ajax的POST请求:

<script type="text/javascript"> 
/* 创建 XMLHttpRequest 对象 */
var xmlHttp; 
function GetXmlHttpObject(){ 
if (window.XMLHttpRequest){ 
// code for IE7+, Firefox, Chrome, Opera, Safari 
xmlhttp=new XMLHttpRequest(); 
}else{// code for IE6, IE5 
xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); 
} 
return xmlhttp; 
} 
// -----------ajax方法-----------// 
function getLabelsPost(){ 
xmlHttp=GetXmlHttpObject(); 
if (xmlHttp==null){ 
alert('您的浏览器不支持AJAX!'); 
return; 
} 
var url="http://www.lifefrom.com/t/"+Math.random(); 
xmlhttp.open("POST",url,true); 
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded"); 
xmlhttp.send(); 
xmlHttp.onreadystatechange=getLabelsOK;//发送事件后,收到信息了调用函数 
} 
function getOkPost(){ 
if(xmlHttp.readyState==1||xmlHttp.readyState==2||xmlHttp.readyState==3){ 
// 本地提示:加载中/处理中 
} 
if (xmlHttp.readyState==4 && xmlHttp.status==200){ 
var d=xmlHttp.responseText; // 返回值 
// 处理返回值 
} 
} 
</script>

注意:XMLHttpRequest 是 AJAX 的基础,在创建 XMLHttpRequest 对象时,必须与你写的ajax方法在同一个‘<script></script>’标签中!否则ajax请求会出错,并无法返回数据。 javascript/js的ajax的POST/GET请求。

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