js
// JavaScript Document
var xmlHttp;
function createXMLHttpRequest() {
if (window.ActiveXObject) {
xmlHttp = new ActiveXObject(“Microsoft.XMLHTTP”);
} else if (window.XMLHttpRequest) {
xmlHttp = new XMLHttpRequest();
}
}
function startRequest() {
var uname=document.getElementById(“uname”).value;
createXMLHttpRequest();
xmlHttp.open(“GET”, “checkName.php?uname=”+uname, true);
xmlHttp.onreadystatechange = handleStateChange;
xmlHttp.send(null);
}
function handleStateChange() {
if (xmlHttp.readyState == 4) {
if (xmlHttp.status == 200) {
var res=xmlHttp.responseText==”true”?”可以使用”:”该用户已经存在”;
document.getElementById(“unameInfo”).innerHTML=res;
}
}
}// JavaScript Document
html