iframe切换内容页仍然能自适应大小代码（含js）

function setIframeHeight(iframe) {
if (iframe) {
var iframeWin = iframe.contentWindow || iframe.contentDocument.parentWindow;
if (iframeWin.document.body) {
iframe.height = iframeWin.document.documentElement.scrollHeight || iframeWin.document.body.scrollHeight;
}
}
};
window.onload = function () {
setIframeHeight(document.getElementById('myiframe'));//iframe的id

};

<iframe onload="setIframeHeight(this)" id="myiframe" name="item-ifram" class="ZhaoShangJiaMeng-ifram" src="ZhaoShangJiaMeng-QuanYi.html" frameborder="0" scrolling="no" ></iframe>