dedecms编辑器中增加代码运行框

<script language="javascript" type="text/javascript">
function copycode(obj) {
var rng = document.body.createTextRange();
var obj1=document.getElementById(obj)
rng.moveToElementText(obj1);
rng.scrollIntoView();
rng.select();
rng.execCommand("Copy");
rng.collapse(false);
}

function runCode(obj) {
var winname = window.open('', "_blank", '');
var obj1=document.getElementById(obj)
winname.document.open('text/html', 'replace');
winname.opener = null // 防止恶意修改
winname.document.writeln(obj1.value);
winname.document.close();
}
function saveCode(obj) {
var winname = window.open('', '_blank', 'top=10000');
var obj1=document.getElementById(obj)
winname.document.open('text/html', 'replace');
winname.document.writeln(obj1.value);
winname.document.execCommand('saveas','','现代视觉创意联盟.htm');
winname.close();
}
</script>
<textarea cols="80" rows="20" name="code" class="code_texear">
</textarea>
<div class="editbox"><input class="code_input" onclick="runCode('code')" type="button" value="运行代码" /> <input class="code_input" onclick="copycode('code')" type="button" value="复制代码" /> <input class="code_input" onclick="saveCode('code')" type="button" value="另存代码" /> <b>提示：您可以先修改部分代码再运行或者直接保存</b> </div>
</div>