JSOM - Delete all items in the sharepoint 2016 list

<input type="button" id="btnSubmit" value="Delete All Items" /><br/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.2/jquery.min.js"></script>
<script>
$(function () {
bindButtonClick();
});
function bindButtonClick() {
$("#btnSubmit").on("click", function () {
deleteAllItemsFromList();
});
}
var clientContext;
var website;
var oList;
var cnt = 0;
function deleteAllItemsFromList() {
clientContext = SP.ClientContext.get_current();
website = clientContext.get_web();
oList = website.get_lists().getByTitle('Announcement');
var camlQuery = new SP.CamlQuery();
camlQuery.set_viewXml('<View><RowLimit>100</RowLimit></View>');
this.collListItem = oList.getItems(camlQuery);
clientContext.load(website);
clientContext.load(collListItem, 'Include(Id)');
clientContext.executeQueryAsync(Function.createDelegate(this, this.onQuerySucceeded), Function.createDelegate(this, this.onQueryFailed));
}
function onQuerySucceeded(sender, args) {
var listItemInfo = '';
var listItemEnumerator = collListItem.getEnumerator();
while (listItemEnumerator.moveNext()) {
var oListItem = listItemEnumerator.get_current();
var ID = oListItem.get_id();
var oListItemDel = oList.getItemById(ID);
oListItemDel.deleteObject();
clientContext.executeQueryAsync(Function.createDelegate(this, this.onDeleteSucceeded), Function.createDelegate(this, this.onDeleteFailed));
}
}
function onQueryFailed(sender, args) {
alert('Failed');
}
function onDeleteFailed(sender, args) {
alert('Failed');
}
function onDeleteSucceeded(sender, args) {
cnt = cnt + 1;
alert('Delete success : ' + cnt);
}
</script>

Javascript Button with two redirect..

<input type="button" value="Submit" name="btnSave" onclick="javascript: {ddwrt:GenFireServerEvent('__commit;__redirect={http://sharepoint.apps.anz/teams/CFX_OTS/ThankYou.htm}')}" />