Using a javascript function to load a page in an iFrame -

Using a javascript function to load a page in an iFrame -

i'm trying use javascript function load web page in iframe named "cake". how can that?

<html>   <head>   </head>   <body>     <button onclick=[function]>load page in iframe</a>   </body> </html>

function changeurl() {      var site = "http://www.w3schools.com";      document.getelementsbyname('iframename')[0].src = site;  }

    <html>        <head>        </head>          <body>            <button onclick="changeurl()">load page in iframe</button>            <iframe name="iframename"></iframe>          </body>      </html>

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