程序中经常用到。需要大量占用服务器资源的运算，如导入，导出数据，经常出现超时错误。采用AJAX异步分批次调用，可以避免PHP出错。以下是示例代码。
public function getAjax()
{
$sid = 11222;
$eid = 22332;
$istep = 57;
$getUrl = '/debug/doajax';
$js = <<<POSTTAG
<script type="text/javascript" src="/js/jquery/jquery-1.11.0.js"></script>
<script>
$(function(){
idfrom = {$sid};
idto = {$eid};
step = {$istep};
function newHttpGet(start,istep,idto)
{
if (start > idto) return;
end = (start + istep < idto ) ? start+istep : idto ;
console.log('start'+start);
console.log('end'+end);
$.ajax({
url:'{$getUrl}',type:'GET',dataType:'json',data:{
psid : start,peid : end,},async:'false',success:function(data) {
console.log(data);
// if (data.status=='ok')
// {
// alert(data.msg);
// }
// else
// {
// alert(data.msg);
// }
newHttpGet(start+istep,idto);
},error:function(data){
console.log("ajax 调用出错"+data);
}
});
}
newHttpGet(idfrom,step,idto);
})
</script>
POSTTAG;
return $js;
}
public function getDoajax()
{
if(Request::ajax())
{
// sleep(1);
$pid = Request::get('psid');
$eid = Request::get('peid');
return Response::json(['status'=>'ok','msg'=>'调用成功','pid'=>$pid,'eid'=>$eid]);
}
}