Promise

return new Promise(function(resolve){
var xhr=new XMLHttpRequest();
xhr.open(‘get’,‘http://115.220.1.104:81/immi/sys/laCarDetail/getCarCards’)
xhr.setRequestHeader(‘Content-Type’, ‘application/json’)
xhr.send();
var array=[“无”];
xhr.οnlοad=function(){
var result= JSON.parse(xhr.responseText).results;
if(result!=null){
result.forEach(item=>{
array.push(item);
});
}
resolve(true)
}
})