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ajax 不错的应用

2017年12月12日  | 移动技术网IT编程  | 我要评论

<script type="text/javascript" language="javascript">

    var http_request = false;

    function makerequest(url) {

        http_request = false;

        if (window.xmlhttprequest) { // mozilla, safari,...
            http_request = new xmlhttprequest();
            if (http_request.overridemimetype) {
                http_request.overridemimetype('text/xml');
            }
        } else if (window.activexobject) { // ie
            try {
                http_request = new activexobject("msxml2.xmlhttp");
            } catch (e) {
                try {
                    http_request = new activexobject("microsoft.xmlhttp");
                } catch (e) {}
            }
        }

        if (!http_request) {
            alert('giving up :( cannot create an xmlhttp instance');
            return false;
        }
        http_request.onreadystatechange = alertcontents;
        http_request.open('get', url, true);
        http_request.send(null);

    }

    function alertcontents() {

        if (http_request.readystate == 4) {
            if (http_request.status == 200) {
                alert(http_request.responsetext);
            } else {
                alert('there was a problem with the request.');
            }
        }

    }
</script>
<span
    style="cursor: pointer; text-decoration: underline"
    onclick="makerequest('test.html')">
        make a request
</span>


[ctrl+a 全选 注:如需引入外部js需刷新才能执行]

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