iframe之后的任何HTML代码都不使用document.write执行

Question

While I was trying to insert an iframe using documnet.write in IE, I got success. But, any html code after that is not executed.

document.write("<div>Hello</div><iframe ..../><div>Bye Bye</div>");

Here "Bye Bye" string is not executed.

For an instant check you can type in your browser url

javascript:document.write("<div>Hello</div><iframe ..../><div>Bye Bye</div>");

After doing trial and error, I found that if I close the iframe tag in the following way, it works.

<iframe ...></iframe> instead of <iframe  ...  />

Now, the problem is "I do not have any opportunity to change the <iframe ../> to <iframe .. ></iframe> ". Looking for your kind advice.

Answer 1

If you are allowed to change the string before it is sent to document.write then you could modify the markup yourself like so:

markup = "<div>Hello</div><iframe ..../><div>Bye Bye</div>"
markup = markup.replace(/<iframe([^>]*?)\/>/g, '<iframe$1></iframe>')
document.write(markup);

Answer 2

If you don't have any opportunity to change both the string (ie you can not read it beforehand) and the document.write part of the code, I assume you at least have permission to edit/insert some code in the document (or else you should not have this question as you can literally do nothing at all).

That way, try tempering the document.write() method by inserting some code before things happen:

document.write=function(str){
    str=str.replace(/<iframe([^>]*?)\/>/ig,'<iframe$1></iframe>');
    return document.writeln(str);
}