js原生http

function $http(url,type,isAsync,time, success,error ){
  var request = new XMLHttpRequest();
  var timeout = false;
  var timer = setTimeout( function(){
    timeout = true;
    request.abort();
  }, time );
  request.open(type, url,isAsync);
  request.onreadystatechange = function(){
    if( request.readyState !== 4 ) return;
    if( timeout ) return;
    clearTimeout( timer );
    if( request.status === 200 ){
      success( request.responseText );
    }else{
      error( request.responseText );
    }
  };
  request.send(null);
}

  function  success(data) {
    console.log(‘成功！‘,data);
  }

  function  error(data) {
    console.log(‘失败！‘,data);
  }

  $http(‘abc‘,‘get‘,true,7000,success,error);