In-depth analysis of contentWindow, contentDocument_basic knowledge

Life is always a big dye vat. When a piece of white cloth goes out, black cloth comes out. When a piece of black cloth goes out, a piece of seven-color cloth comes out.
contentWindow is compatible with various browsers and can obtain the window object of the child window.
contentDocument Firefox support, > IE8 support. The document object of the child window can be obtained.
Set the parent iframe or grandchild iframe height in the child iframe.

Copy code The code is as follows:

function showIframeH(){
var parentWin = parent.document.getElementById("test");
if(!parentWin) return false;
var sub = parentWin.contentWindow.document.getElementById("test2");
if(!sub ) return false;
var thirdHeight = sub.contentWindow.document.body.offsetHeight; //Third layer body object
sub.height = thirdHeight; //Set the height of the second layer iframe
var secondHeight = x.contentWindow.document.body.offsetHeight; //Second layer body object
x.height = secondHeight; //Set the height of the first layer iframe
//alert(secondHeight);
/ /alert('body: ' x.contentDocument.body.offsetHeight ' div:' thirdHeight);
}