简单的汇率转换工具—初试AJAX

今天自己折腾了一个简单的汇率转换工具，顺便简单的学习了一下AJAX技术，在这里做个记录，以便自己以后查询。废话不多说，直接上代码：
convert.PHP 文件内容：

<!DOCTYPE html>    
<html>    
<head>    
<Meta charset="utf-8">    
<title>汇率转换</title>    
<Meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=0">     
</head>    
<body ontouchstart="">    
<div class="wxapi_container">    
<div class="wxapi_index_container">    
<table>
<tr>
<td>从：</td>
<td>
<select id="select1">
  <option value="USD" selected = "selected">美元</option>
  <option value="EUR">欧元</option>
  <option value="GBP">英镑</option>
  <option value="AUD">澳元</option>
  <option value="CAD">加元</option>
  <option value="HKD">港元</option>
  <option value="CNY">人民币</option>
</select>
</td> 
</tr>
<tr>
<td>到：</td>
<td>
<select id="select2">
  <option value="USD">美元</option>
  <option value="EUR">欧元</option>
  <option value="GBP">英镑</option>
  <option value="AUD">澳元</option>
  <option value="CAD">加元</option>
  <option value="HKD">港元</option>
  <option value="CNY" selected = "selected">人民币</option>
</select>
</td> 
</tr>
<tr>
<td></td>
<td><input type="button" value="转换" onclick="convert()"></td> 
</tr>
 <tr>
<td>结果：</td>
<td><input type="text" id="result" value="0" readonly="true"></td>
</tr>
</table>
</div>     
</div>    
</body>    
<script src="http://res.wx.qq.com/open/js/jweixin-1.0.0.js"></script>   
<script> /** * 普通Ajax的完整访问过程 */ var xmlHttp function convert()//登录转换点击后执行这个方法 { var select1=document.getElementById("select1").value; var select2=document.getElementById("select2").value; if (select1 == select2 )//不能从人民币转换为人民币 { document.getElementById("result").value="请选择不同的货币单位"; return } xmlHttp=GetXmlHttpObject() if (xmlHttp==null) { alert ("Browser does not support HTTP Request") return } var url="change.PHP"//设置要提交action到后台的那个处理请求的文件名  url=url+"?scur="+select1+"&tcur="+select2//为这个路径加上参数 url=url+"&sid="+Math.random()//为这个路径加上一个随机数  xmlHttp.onreadystatechange=stateChanged//每当 readyState 改变时，就会触发 onreadystatechange 事件，readyState 属性存有 XMLHttpRequest 的状态信息  xmlHttp.open("GET",url,true)//定义请求的参数  xmlHttp.send(null)//发送请求  } function stateChanged() { if (xmlHttp.readyState==4 || xmlHttp.readyState=="complete") //0: 请求未初始化  //1: 服务器连接已建立  //2: 请求已接收  //3: 请求处理中  //4: 请求已完成，且响应已就绪  { var a= xmlHttp.responseText;//把相应数据赋值给a  var resultinput=document.getElementById("result"); resultinput.value = a; } } function GetXmlHttpObject() { var xmlHttp=null; try { // Firefox,Opera 8.0+,Safari  xmlHttp=new XMLHttpRequest(); } catch (e) { // Internet Explorer  try { xmlHttp=new ActiveXObject("Msxml2.XMLHTTP"); } catch (e) { xmlHttp=new ActiveXObject("Microsoft.XMLHTTP"); } } return xmlHttp; } </script>     
</html>

change.PHP 文件内容如下：

<?PHP  

//header("Content-Type:text/html;charset=UTF-8");  
function nowapi_call($a_parm){  
    if(!is_array($a_parm)){  
        return false;  
    }  
    //combinations  
    $a_parm['format']=empty($a_parm['format'])?'json':$a_parm['format'];  
    $apiurl=empty($a_parm['apiurl'])?'http://api.k780.com:88/?':$a_parm['apiurl'].'/?';  
    unset($a_parm['apiurl']);  
    foreach($a_parm as $k=>$v){  
        $apiurl.=$k.'='.$v.'&';  
    }  
    $apiurl=substr($apiurl,0,-1);  
    if(!$callapi=file_get_contents($apiurl)){  
        return false;  
    }  
    //format  
    if($a_parm['format']=='base64'){  
        $a_cdata=unserialize(base64_decode($callapi));  
    }elseif($a_parm['format']=='json'){  
        if(!$a_cdata=json_decode($callapi,true)){  
            return false;  
        }  
    }else{  
        return false;  
    }  
    //array  
    if($a_cdata['success']!='1'){  
        echo $a_cdata['msgid'].' '.$a_cdata['msg'];  
        return false;  
    }  
    return $a_cdata['result'];  
}  

//$nowapi_parm['app']='finance.rate';  
//$nowapi_parm['scur']='GBP';  
//$nowapi_parm['tcur']='CNY';  
///$nowapi_parm['appkey']='10003';  
//$nowapi_parm['sign']='b59bc3ef6191eb9f747dd4e83c99f2a4';  
//$nowapi_parm['format']='json';  
//if(!$result=nowapi_call($nowapi_parm)){  
//    die('fail');  
//}  
//var_dump($result);  
//print_r($result);  
//echo " scur : ".$result['scur']."<br>";  
//echo " tcur : ".$result['tcur']."<br>";  
//echo " ratenm : ".$result['ratenm']."<br>";  
//echo " rate : ".$result['rate']."<br>";  
//echo " update : ".$result['update']."<br>";  




function convert($scur,$tcur){
    $nowapi_parm['app']='finance.rate';  
    $nowapi_parm['scur']= $scur;  
    $nowapi_parm['tcur']= $tcur;  
    $nowapi_parm['appkey']='10003';  
    $nowapi_parm['sign']='b59bc3ef6191eb9f747dd4e83c99f2a4';  
    $nowapi_parm['format']='json';
    if(!$result=nowapi_call($nowapi_parm)){  
        return "转换失败！";
    }
    else{
        return $result['rate'];
    }  
}

$scur=$_GET["scur"]; 
$tcur=$_GET["tcur"]; 
//file_put_contents("./test.txt","scur = " . $scur . "\n",FILE_APPEND);
//file_put_contents("./test.txt","tcur = " . $tcur . "\n","result = " . convert($scur,$tcur) . "\n",FILE_APPEND);
echo convert($scur,$tcur);

?>

简单的效果图如下：

简单的汇率转换工具---初试AJAX

简单的汇率转换工具—初试AJAX

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