//parent.html
<html>
<script>
function hiddenDiv(){
//如何隐藏child.html中id='d'的div
}
</script>
<body>
<iframe id="ch" src="child.html"/>
</body>
</html>//child.html
<html>
<body>
<form name="f">
<div id="d">
<label>hello</label>
</div>
<input type="button" value="parent.hiddenDiv();"/>
</form>
</body>
</html>
<html>
<script>
function hiddenDiv(){
//如何隐藏child.html中id='d'的div
}
</script>
<body>
<iframe id="ch" src="child.html"/>
</body>
</html>//child.html
<html>
<body>
<form name="f">
<div id="d">
<label>hello</label>
</div>
<input type="button" value="parent.hiddenDiv();"/>
</form>
</body>
</html>
<body>
<form name="f">
<div id="d">
<label>hello </label>
</div>
<input type="button" value="parent.hiddenDiv();" onclick="document.getElementById('d').style.display='none'"/>
</form>
</body>
</html>
var d = ch.getElementById("d");
d.style.display = 'none';