演示一：Javascript操作iframe

1.父窗口获取iframeA中的值

function getValiframeA(){
	var valA = getIFrameDOM("wIframeA").getElementById('iframeA_ipt').value;
	document.getElementById("result").innerHTML = "获取了子窗口iframeA中输入框里的值：<span style='color:#f30'>"+valA+"</span>";
}

2.父窗口设置iframeA中的值

function setValiframeA(){
	getIFrameDOM("wIframeA").getElementById('iframeA_ipt').value = 'Helloweba';
	document.getElementById("result").innerHTML = "设置了了子窗口iframeA中输入框里的值：<span style='color:#f30'>Helloweba</span>";
}

3.父窗口设置iframeA的h1标签背景色

function setBgiframeA(){
	getIFrameDOM("wIframeA").getElementById('title').style.background = "#ffc";
}

演示二：自适应高度 autoHeight.html

在iframe完全加载后即onload，调用setIframeHeight()，iframe内容加载完成后，可获取iframe的高度值，然后重新设置iframe的高度，以下是整理好的代码：

function setIframeHeight(id) { 
    var ifrm = document.getElementById(id); 
    var doc = ifrm.contentDocument? ifrm.contentDocument:  
        ifrm.contentWindow.document; 
    ifrm.style.visibility = 'hidden'; 
    ifrm.style.height = "10px"; // reset to minimal height ... 
    ifrm.style.height = getDocHeight( doc ) + 4 + "px"; 
    ifrm.style.visibility = 'visible'; 
} 
 
function getDocHeight(doc) { 
    doc = doc || document; 
    var body = doc.body, html = doc.documentElement; 
    var height = Math.max( body.scrollHeight, body.offsetHeight,  
        html.clientHeight, html.scrollHeight, html.offsetHeight ); 
    return height; 
}

点击查看<a href='/jquery/3/393/demo/autoHeight.html'>自适应高度演示地址</a>

演示三：iframe跨域

敬请期待