javascript - iframe的designMode兼容火狐
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>grid</title>
</head>
<body>
<iframe src=""></iframe>
</body>
<script type="text/javascript">
var ifa=document.getElementsByTagName('iframe')[0];
ifa.contentDocument.designMode='on';
ifa.contentWindow.document.designMode='on'
</script>
</html>
https://developer.mozilla.org...
让iframe成为可编辑模式，chrome和ie可以，但是火狐好像不能，要怎么解决呢？？谢谢
