How to disable google tag manager and google analytics

Hi I used following code for disable google analytics and google tag manager but its not worked.

<script>
var gaoop_property    = 'UA-xxxxxxxx-x';
var gaoop_disable_str = 'ga-disable-' + gaoop_property;
function gtmOptOut() {
    document.cookie = gaoop_disable_str + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';       
    window[gaoop_disable_str] = true;        
    window.location.reload();
}
</script>

Does anyone know how I can fix this? Thank you.

from How to disable google tag manager and google analytics