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function qty(){ const i=document.querySelector( '.details-product-purchase input[type="number"]' ); if(!i||i.closest('.gws-qty'))return; if(!i.value)i.value=1; const w=document.createElement('div'); w.className='gws-qty'; const minus=document.createElement('button'); minus.type='button'; minus.className='gws-minus'; minus.textContent='−'; const plus=document.createElement('button'); plus.type='button'; plus.className='gws-plus'; plus.textContent='+'; i.parentNode.insertBefore(w,i); w.append(minus,i,plus); function change(dir){ const step=Number(i.step)||1; const min=i.min===''?1:Number(i.min); const max=i.max===''?999:Number(i.max); let v=Number(i.value)||min; v=Math.min(max,Math.max(min,v+(dir*step))); i.value=v; i.dispatchEvent( new Event('input',{bubbles:true}) ); i.dispatchEvent( new Event('change',{bubbles:true}) ); } minus.addEventListener('click',()=>change(-1)); plus.addEventListener('click',()=>change(1)); }