javascript - Problem with url -

var x = 20; xhr.open('get','http://127.0.0.1:8000/insert/x); 

how can pass value of x in http string , get

xhr.open('get','http://127.0.0.1:8000/insert/20); request?  

xhr.open('get','http://127.0.0.1:8000/insert/' + x);