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  • Ajax基础创建XMLHttpRequest对象

    var http_request = false;
    function send_request(url) {
        //初始化,指定处理函数,发送请求的函数 
        http_request = false;
        //开始初始化XMLHttpRequest对象 
        if (window.XMLHttpRequest) {
            //Mozilla 浏览器 
            http_request = new XMLHttpRequest();
            if (http_request.overrideMimeType) {
                //设置MiME类别 
                http_request.overrideMimeType('text/xml');
            }
        }
        else if (window.ActiveXObject) {
            // IE浏览器 
            try {
                http_request = new ActiveXObject("Msxml2.XMLHTTP");
            }
            catch (e) {
                try {
                    http_request = new ActiveXObject("Microsoft.XMLHTTP");
                }
                catch (e) { }
            }
        }
        if (!http_request) {
            // 异常,创建对象实例失败 
            window.alert("不能创建XMLHttpRequest对象实例.");
            return false;
        }
        http_request.onreadystatechange = processRequest;
        // 确定发送请求的方式和URL以及是否同步执行下段代码 
        http_request.open("GET", url, true);
        http_request.send(null);
    }
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  • 原文地址:https://www.cnblogs.com/keiling/p/3072351.html
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