下面是封装好的ajax的函数

    function AjaxObj() {  
        this.xmlHttp = null;  
        this.Request = function(method, url, data, callback, sync) {  
            if (window.ActiveXObject) {  
                this.xmlHttp = new ActiveXObject("Microsoft.XMLHttp");  
            } else if (window.XMLHttpRequest) {  
                this.xmlHttp = new XMLHttpRequest();  
                if (this.xmlHttp.overrideMimeType) {  
                    this.xmlHttp.overrideMimeType('text/xml');  
                }  
            }  
            if (this.xmlHttp) {  
                var self = this;  
                if (callback)  
                    this.xmlHttp.onreadystatechange = function(){callback(self.xmlHttp);};  
                else  
                    this.xmlHttp.onreadystatechange = function(){return;};  
                if (!method)  
                    method = "POST";  
                method = method.toUpperCase();  
                if (method == 'GET') {  
                    this.xmlHttp.open('GET', url + ((typeof data=="string")?('?' + data):""), typeof sync == "boolean" ? sync : true);  
                    this.xmlHttp.send(null);  
                } else {  
                    this.xmlHttp.open('POST', url, typeof sync == "boolean" ? sync : true);  
                    this.xmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");  
                    this.xmlHttp.send(data);  
                }  
            }  
        };  
        this.abort = function() {  
            if (this.xmlHttp)  
                this.xmlHttp.abort();  
        };  
        this.swRequest = function(cfg){  
            if(!cfg.url)  
                return;  
            this.Request(cfg.method||"POST",cfg.url||"",cfg.data,function(req){  
                if(req.readyState==4){  
                    if(req.status==200||req.status==0){  
                         var obj = null;  
                         var text = req.responseText;  
                         eval("obj = "+ text);  
                         cfg.success.call(cfg.soap||this,obj);  
                        return;  
                    }else{  
                         cfg.failure.call(cfg.soap||this,"错误!");  
                         return;  
                    }  
                }  
            });  
        };  
    }  

?调用方法：

ajax.swRequest({
    method:"POST",
    sync:false,
    url:'?a=manage&m=checkUser',
    data:"user="+user.value,
    success: function(msg) {
        if(msg==1){
            flag.value = 'true';
        } else {
            flag.value = '';
        }
    },
    failure: function(a) {
        alert(a);
    },
    soap:this
});

?

本文链接：javascript封装的ajax函数库

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