Untitled

content = "<script>" + js_code + "</script>";

$('#iframe_id').contents().find('body').append(content);

var script = "alert('hello world');";
$('#iframe').contents().find('body').append($('<script>').html(script))

$("#iframe").contents().find("body").append(decodeURI("**%3Cscript%3E** alert(2)  **%3C/script%3E**"));

var scriptTag = "<script>alert(1)<";
scriptTag +=  "/script>";
console.log(scriptTag);
$("#iframe").contents().find("body").append(scriptTag);

var scriptTag = "<script>alert(1)</script>";
$("#iframe").contents().find("body").append(scriptTag);

function initFrame (code){

    eval (code);

}

initFrame.apply ($('#iframe').contents(),[js_code]);

var initFrame = new Function(js_code);


initFrame.apply ($('#iframe').contents(),[]);

<script type="text/javascript" src="/jquery/jquery-ui-1.9.1.custom.js"></script>

<iframe id="frame"></iframe>

$("#frame").attr(
   "src", "data:text/html;charset=utf-8," +
   "<html>" +
   "<style>.red {color: red}</style>" +
   "<div class="test">Test</test>" +
   "<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"><" + "/script>" +
   "<script>$(function(){ $(".test").addClass("red")});<" + "/script>" +
   "</html>"
);

function putScriptInIframes(script, scriptId) {

   var $iframes = $('iframe');
   $iframes.each(function () {
        var thisDoc = this.contentWindow.document;
        if ( ! thisDoc.getElementById(scriptID)) {
            var scriptObj = thisDoc.createElement("script");
            scriptObj.type = "text/javascript";
            scriptObj.id = scriptId;
            scriptObj.innerHTML = script;
            thisDoc.body.appendChild(scriptObj);
        }
    });
}