javascript - Display Background Color before Popup? -


i set background color of green before alert pops up.. how do this?

    <meta http-equiv="content-type" content="text/html; charset=utf-8">     <head><meta charset="utf-8" />     <style> html, body{         background: #0f0; }     </style>     </head>      <title>hi there!</title>     <script language='javascript'>             window.alert('hello there!')     </script>

i thought trick alert pops on white page

use this:

<html>     <head>         <meta http-equiv="content-type" content="text/html; charset=utf-8">         <meta charset="utf-8" />          <title>hi there!</title>          <style>             body{                     background: #0f0;             }         </style>          <script>             function showmessage() {                 window.alert('hello there!')             }         </script>     </head>      <body onload="showmessage();">         ..     </body>  </html>

note onload attribute in body tag. value of attribute javascript code executed once page loaded (css, images, etc).

and if want delay, change showmessage function this:

function showmessage() {     var secondsdelay = 5; //5 seconds     settimeout(function() {         window.alert('hello there!');     }, secondsdelay * 1000); }

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