基于js原生和ajax的get和post方法以及jsonp的原生写法实例

login.onclick = function(){var xhr = new XMLHttpRequest();xhr.open("get","http://localhost/ajax2/test2.php?username="+username.value+"&pwd="+pwd2.value,true);xhr.send();xhr.onreadystatechange = function(){if (xhr.readyState == 4) {if (xhr.status>=200 && xhr.status<300) {alert(xhr.responseText);};};}}

btn.onclick = function(){ajax(    "GET",    "http://localhost/ajax2/my02.php",    {xingming:xingming.value,pwd:pwd.value},    function(data){console.log(data);},function(errCode){console.log(errCode);})

var xhr = new XMLHttpRequest();xhr.open("post","http://localhost/ajax2/login2.php",true);var data = {username:username1.value,pwd:pwd1.value}// 设置请求头 告诉服务器发给他的数据是json格式xhr.setRequestHeader("content-type","application/json");xhr.send( JSON.stringify(data) );xhr.onreadystatechange = function(){if (xhr.readyState == 4) {if ( xhr.status >= 200 && xhr.status < 300 ) {alert(xhr.responseText);};};}

var sc = document.createElement("script");sc.type = "text/javascript";document.body.appendChild(sc);sc.src = "http://localhost/ajax2/jsonp.php?cb=myCallBack";function myCallBack(data){console.log(data);}