As shown below: Copy codeThe code is as follows: <br> #main{border:1px solid black; width:200px;margin:0px auto;padding:100px;}<br> ="text/javascript"><br> window.onload = function () {<br> // setInterval(showMsg, 1000); string, and added brackets <br> setInterval(methodName, 1000); Execute alert('a') every 1 second<strong> }<font style="COLOR: #ff0000"> var seconds = 5;<br> 🎜 > Document.GetelementByid ("msg"). Innerhtml = seconds "automatically close after seconds!"; </font>} </strong> Else {<br> Window.close (); <strong> 🎜>} <font style="COLOR: #ff0000"> </script><br></head></font><body></strong> <div id="main"><br> This is the ad form:<br> <div id ="msg">Automatically close after 5 seconds! </div><br> </div><br></body><br></html><br><br><br></p> </div>
