最全ajax函数

function ajax(method, url, data, success) {
	var xhr = null;
	try {
		xhr = new XMLHttpRequest();
	} catch (e) {
		xhr = new ActiveXObject('Microsoft.XMLHTTP');
	}

	if (method == 'get' && data) {
		url += '?' + data;
	}

	xhr.open(method,url,true);
	if (method == 'get') {
		xhr.send();
	} else {
		xhr.setRequestHeader('content-type', 'application/x-www-form-urlencoded');
		xhr.send(data);
	}

	xhr.onreadystatechange = function() {

		if ( xhr.readyState == 4 ) {
			if ( xhr.status == 200 ) {
				success && success(xhr.responseText);
			} else {
				alert('出错了,Err：' + xhr.status);
			}
		}

	}
}