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PHP 与 js json的通信实例

WBOY
WBOYOriginal
2016-05-25 16:42:471254browse

简介一下json吧,json(object notation) 是一种轻量级的数据交换格式,易于人阅读和编写,同时也易于机器解析和生成,它基于javascript programming language,standard ecma-262 3rd edition - december 1999的一个子集,json采用完全独立于语言的文本格式,但是也使用了类似于c语言家族的习惯(包括c, c++, c#, java, javascript, perl,python等),这些特性使json成为理想的数据交换语言.

json建构于两种结构:

"名称/值"对的集合(a collection of name/value pairs),不同的语言中,它被理解为对象(object),纪录(record),结构(struct),字典(dictionary),哈希表(hash table),有键列表(keyed list),或者关联数组(associative array).

值的有序列表(an ordered list of values),在大部分语言中,它被理解为数组(array).

php文件代码:

<?php  
    $res[&#39;id&#39;] = $_post[&#39;id&#39;];  
    $res[&#39;name&#39;] = "elar";  
    $res[&#39;age&#39;] = "21";  
    $response = "hello this is response".$_post[&#39;id&#39;];  
    echo json_encode($res);  
?>

js代码:

<script type="text/javascript">  
    function getjson() {
        var xmlhttp;
        try {
            // firefox, opera 8.0+, safari
            xmlhttp = new xmlhttprequest();
        } catch (e) {
            // internet explorer
            try {
                xmlhttp = new activexobject("msxml2.xmlhttp");
            } catch (e) {
                try {
                    xmlhttp = new activexobject("microsoft.xmlhttp");
                } catch (e) {
                    alert("您的浏览器不支持ajax!");
                    return false;
                }
            }
        }
        xmlhttp.onreadystatechange = function () {
            if (xmlhttp.readystate == 4) {
                //alert(xmlhttp.responsetext);
                var str = xmlhttp.responsetext;
                document.getelementbyid(&#39;show&#39;).innerhtml += str;
                //alert(str);
                var obj = eval(&#39;(&#39; + xmlhttp.responsetext + &#39;)&#39;);
                //var obj = eval(({"id":"123","name":"elar","age":"21"}));
                alert(obj.name);
            }
        }
        var data = "id=123";
        xmlhttp.open("post", "testjson.php", true);
        xmlhttp.setrequestheader("content-type", "application/x-www-form-urlencoded");
        xmlhttp.send("id=123");
    }
</script>

 


 

 


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