ajax（1）helloword(GET)

<script>

window.onload = function(){

var elem = document.getElementByTagName("a");

elem.onclick = function(){

var url = this.href;

var method = "GET";

elem.open(method,urrl);

elem.send(null);

elem.onreadystatechange = function(){

if(elem.readystate == 4){

if(elem.state == 200 || elem.state == 304){

alert(elem.requestText);

}

}

}

}