html - Failure in the querySelectorAll() from JavaScript

I'm having a problem when I try to get a element by using querySelectorAll.

Here is the part of HTML that I want to get from JS:

    
 {{1}} 
    
{{2}}
    
{{3}}
    
{{4}}
    
{{5}}
    
{{6}}

    
{{7}}
    
{{8}}
    
{{9}}
    
{{10}}
    
...
  

I'm doing this on JavaScript:

var pages = document.querySelectorAll(".pag-base a");
console.log(pages[0].textContent);

but this always returns undefined. Anyone knows what am I doing wrong?