I need to get rid of the parentheses around a number inside of a

by

Just replace jquery with querySelector and set textContent instead of text

var el = document.querySelector('span.slicethis');
el.textContent = el.textContent.slice(1, -1);

Demo

var el = document.querySelector('span.slicethis');
el.textContent = el.textContent.slice(1, -1);
<span class="slicethis">(10)</span>

Edit

$('span.slicethis') iterate over all the items that match this selector, so if there are going to be multiple such elements, then you need to iterate them using querySelectorAll

[ ...document.querySelectorAll('span.slicethis') ].forEach( function(el){
    el.textContent = el.textContent.slice(1, -1);  
});


[ ...document.querySelectorAll('span.slicethis') ].forEach( function(el){
    el.textContent = el.textContent.slice(1, -1);  
});
<span class="slicethis">(1)</span>
<span class="slicethis">(10)</span>
<span class="slicethis">(100)</span>

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