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AJAX JSON 实例


 我们可以通过AJAX代码获取JSON数据。AJAX提供了异步获取响应的工具。它不会重新加载页面并节省带宽。

 让我们看一个使用AJAX代码获取JSON数据的简单示例。

<html>  
<head>  
<meta content="text/html; charset=utf-8">  
<title>AJAX JSON by Javatpoint</title>  
<script type="application/javascript">  
function load()  
{  
   var url = "http://date.jsontest.com/";//use any url that have json data  
   var request;  
  
   if(window.XMLHttpRequest){    
    request=new XMLHttpRequest();//for Chrome, mozilla etc  
   }    
   else if(window.ActiveXObject){    
    request=new ActiveXObject("Microsoft.XMLHTTP");//for IE only  
   }    
   request.onreadystatechange  = function(){  
      if (request.readyState == 4  )  
      {  
        var jsonObj = JSON.parse(request.responseText);//JSON.parse() returns JSON object  
        document.getElementById("date").innerHTML =  jsonObj.date;  
        document.getElementById("time").innerHTML = jsonObj.time;  
      }  
   }  
   request.open("GET", url, true);  
   request.send();  
}  
</script>  
</head>  
<body>  
  
Date: <span id="date"></span><br/>  
Time: <span id="time"></span><br/>  
  
<button type="button" onclick="load()">Load Information</button>  
</body>  
</html>