Testing Javascript through URL keyword

Below code can be used to test javascript with a keyword and will not affect main store. Note: errors in code might break other scripts running on the live page.

if(window.location.href.indexOf("?MyKeyword") > -1){
   // Code will only work with above keyword in url address
}

Below code will redirect url unless it has '?MyKeyword' in url. Nice if you have to use a test product you can redirect to the main product in the product description.

if(window.location.href.indexOf("?MyKeyword") > -1){
  // Code
}
else{
  window.location.replace("www.google.com");
}