<script language="ecmascript" type="text/ecmascript">
var clientContext = null;
var web = null;
function getWebProperties() {
clientContext = new SP.ClientContext.get_current();
web = clientContext.get_web();
clientContext.load(web);
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}
function onQuerySucceeded() {
var message = "Web retrieved:";
message += "\n Title: " + web.get_title();
message += "\n Description: " + web.get_description();
alert(message);
}
function onQueryFailed(sender, args) {
alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace());
}
</script>
<input id="btnGetWebProperties" onclick="getWebProperties()" type="button" value="Get the web properties"/>