let params={},
order=[]
location.search.replace(/^?/,'').split('&').forEach(pie=>{
    let [k,v]=pie.split('=')
    params[k]=v
    order.push(k)
})
$(document).keydown(e=>{
    if(!e.which==46) return
    delete params[order.pop()]
    console.log(params)
    window.history.replaceState('','',location.origin+(order.length?'/?'+order.reduce((prev,cur)=>prev.concat(cur+'='+params[cur]),[]).join('&'):''))
})