detect_js_version

detect_js_version.js

var ifr = document.createElement('iframe');
ifr.src = 'javascript:;';
ifr.style.display = 'none';
document.body.appendChild(ifr);
var js = [];
for (var i = 0; i < 11; i++) {
	js.push('<script ' + (i !== 0 ? 'language="Javascript1.' + i + '"' : 'type="text/language"') + '">window.jsversion = 1.'+ i +';</script>');
}
ifr.contentWindow.document.write(js.join(''));
console.log(ifr.contentWindow.jsversion);
ifr.parentNode.removeChild(ifr);