javascript code runner_javascript skills

<textarea id="code" cols="80" rows="15"> <input type="button" onclick="runCode(code)" value="运行代码" style="border:1px solid #B1B4CD;background:#696D81;color:#FFFFFF; padding-top:5px;"> <input type="button" onclick="copycode(code)" style="border:1px solid #B1B4CD;background:#696D81;color:#FFFFFF; padding-top:5px;" value="复制代码"> <input type="button" onclick="saveCode(code)" style="border:1px solid #B1B4CD;background:#696D81;color:#FFFFFF; padding-top:5px;" value="另存代码"> Tip: You can modify part of the code before running
[Ctrl A select all Note: If you need to introduce external Js, you need to refresh to execute

]<script> var userAgent = navigator.userAgent.toLowerCase(); var is_opera = userAgent.indexOf('opera') != -1 && opera.version(); var is_saf = userAgent.indexOf('applewebkit') != -1 || navigator.vendor == 'Apple Computer, Inc.'; var is_webtv = userAgent.indexOf('webtv') != -1; var is_ie = (userAgent.indexOf('msie') != -1 && !is_opera && !is_saf && !is_webtv) && userAgent.substr(userAgent.indexOf('msie') + 5, 3); function runCode(obj) { var winname = window.open('', "_blank", ''); winname.document.open('text/html', 'replace'); winname.opener = null; // 防止代码对论谈页面修改 winname.document.write(obj.value); winname.document.close(); } function saveCode(obj) { var winname = window.open('', '_blank', 'top=10000'); winname.document.open('text/html', 'replace'); winname.document.write(obj.value); winname.document.execCommand('saveas','','code.htm'); winname.close(); } function copycode(obj) { if(is_ie && obj.style.display != 'none') { var rng = document.body.createTextRange(); rng.moveToElementText(obj); rng.scrollIntoView(); rng.select(); rng.execCommand("Copy"); rng.collapse(false); } } </script>