How does js splice to get such a result data.nav1?

how to splice js to get such a result data.nav1 data.nav2? Numbers are dynamic.

function showNav(n){
    for(let i = 0;i<data.nav+n.length;iPP){
        html += `<li><a href="-sharp">${data.nav+n[i].name}</a></li>`;
    }
}
Mar.10,2021

use data ['nav'+n] .length

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