SharePoint Load ClientContext

This how to load ClientContext

var clientContext;
var website;

SP.SOD.executeFunc('sp.js', 'SP.ClientContext', sharePointReady);

// Create an instance of the current context.
function sharePointReady() {
    clientContext = SP.ClientContext.get_current();
    website = clientContext.get_web();

    clientContext.load(website);

    clientContext.executeQueryAsync(onRequestSucceeded, onRequestFailed);
}

function onRequestSucceeded() {
    alert(website.get_url());
alert(g_wsaSiteTemplateId );
}
function onRequestFailed(sender, args) {
    alert('Error: ' + args.get_message());
}