JS method to modify the background color of iframe page

This article describes how JS modify the background color of iframe page. Share it for your reference. The details are as follows:

The following code demonstrates how to modify the web background color of the embedded iframe in a web page through JS code

<!DOCTYPE html>
<html>
<head>
<script>
function changeStyle()
{
var x=("myframe");
var y=( || );
if ()y=;
="#0000ff";
}
</script>
</head>
<body>
<iframe  src="demo_iframe.htm">
<p>Your browser does not support iframes.</p>
</iframe>
<br><br>
<input type="button" onclick="changeStyle()" 
value="Change background color">
</body>
</html>

I hope this article will be helpful to everyone's JavaScript programming.