Delete SharePoint List or Document Library.

var Title = "TestsDelete";
function deleteList(Title) {
    var clientContext = new SP.ClientContext.get_current();
    var oWebsite = clientContext.get_web();  

    this.oList = oWebsite.get_lists().getByTitle(Title);
    oList.deleteObject();

    clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}

function onQuerySucceeded() {
    alert(Title  + ' deleted.';);
}

function onQueryFailed(sender, args) {
    alert('Request failed. ' + args.get_message() );
}
 deleteList(Title ) ;