<script>
window.onload=function(){
document.getElementsByTagName('a')[0].onclick=function(){
var request=new XMLHttpRequest();
’ ’ ’ s out out way out through out way out through outce out out out out out out out out out out off to ’'s' ‐ ‐ ‐ww's' ;
request.send(null); //Send Ajax request to the server, the get here does not need to pass parameters
request.onreadystatechange=function(){ //Continuously monitor the server side Response
if(request.readyState==4&&request.status=200){ //The request status is 4 and the request code is 200, which means the server effect is successful
document.getElementsByTagName('h3' )[0].innerHTML=request.responseText //Get the text information and display it at the h3 position
}
}
return false ; / /Cancel the default jump behavior of a tag
}
}
</script>
request.readyState==4&&request.status=200
Look carefully at this code