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window.frames["MW_IFRAME"].focus();
window.frames["MW_IFRAME"].document.execCommand("bold");
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Miniweaver 2010</title>
<script type="text/javascript">
<!--
MW = null;
function exec(command, value){
document.getElementById('MW').contentWindow.focus();
MW.execCommand(command, false, value);
}
window.onload = function() {
MW = document.getElementById("MW").contentDocument || document.getElementById("MW").contentWindow.document;
MW.designMode="on";
}
//-->
</script>
</head>
<body>
<button onclick="exec('bold')">加粗</button><br />
<iframe id="MW" name="MW" width="400" height="300" style="border:#FF0000 3px inset;"></iframe>
</body>
</html>