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JS initiates long polling to get push messages

Source: Internet
Author: User
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<!DOCTYPE HTML><HTMLLang= "en -us"><Head>    <MetaCharSet= "UTF-8">    <title></title>    <Scripttype= "Text/javascript"src= "Http://apps.bdimg.com/libs/jquery/1.8.1/jquery.min.js"></Script></Head><Body>    <Divclass= "tmp">123</Div>    <Scripttype= "Text/javascript">    //POST Request    functionClin_post () {$.post ("test.php",function(data) {$ ('. tmp'). HTML (data);        Clin_post (); },'JSON');    } clin_post (); </Script></Body></HTML>

A request is initiated again in the callback with JS initiating request to get a poll

PHP server can use time limit

<?PHP$start _time= Time();$num= 5;$diff _time= 0; while( ($num-$diff _time) >0 ) {    $now= Time(); $diff _time=$now-$start _time;}EchoJson_encode (Date(' y-m-d h:i:s '));?>

or directly with the sleep function.

<? PHP Sleep (5); echo json_encode (date(' y-m-d h:i:s '));? >

JS initiates long polling for push messages

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