iframe自适应子界面高度

 <iframe src ="" id="iframe" width="100%"  onload="changeFrameHeight()" scrolling="no" frameborder="0"></iframe>

function changeFrameHeight() {
var ifm = document.getElementById("iframe");
ifm.height = document.documentElement.clientHeight;
}
window.onresize = function () {
changeFrameHeight();
}