正文
Ajax原生写法
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用太久JQuery了，别忘了Ajax原生是怎么写的
var Ajax = {
get : function (url, callback) { var req = Ajax.getRequest(callback); req.open("GET", url, true);
req.setRequestHeader("If-Modified-Since","0");
req.send(null);
},
post : function (url, param, callback) { var req = Ajax.getRequest(callback); req.open("POST", url, true);
req.setRequestHeader("Content-Type", "application/x-www-form-urlencoded; charset=UTF-8");
req.setRequestHeader("If-Modified-Since","0");
req.send(param);
},
getRequest : function (callback) {
var req;
try {
req = new XMLHttpRequest();
} catch (error) {
try {
req = new ActiveXObject("Microsoft.XMLHTTP");
} catch (error) {
return null;
}
}
req.onreadystatechange = function() {
if (req.readyState != 4)
return;
if (req.status == 200) {
callback(req);
} else
alert("请求失败:" + req.statusText);
return true;
};
return req;
},
encode : function (str) {
return encodeURIComponent(str);
}
};
