问在I request.send()之后，我必须总是创建一个新的请求obj吗？

EN

var allPages= [20,40,60,80,100,120,140];
var request = new XMLHttpRequest();
var allPokemon =[];

function firstPage(){
request.open('GET', 'http://pokeapi.salestock.net/api/v2/pokemon/', true);
request.onload = function () {
    var data= JSON.parse(this.response);
    for(var i=0; i<20; i++){
    allPokemon.push(data.results[i].name);
    }
};
request.send();
}

function remaining(){
    for (var i=0;i<allPages.length;i++){
        var url = "http://pokeapi.salestock.net/api/v2/pokemon/?offset="+allPages[i];
        request.open('GET', url, true);
        request.onload= function(){
            var data = JSON.parse(this.response);
             for(var j=0; j<20; j++){
                 allPokemon.push(data.results[j].name);
             }    
        };
    }
    request.send(); 
}
firstPage();
remaining();
console.log(allPokemon);