objname是HTML代码内容的元素ID

function runcode(objname) {
  var winname = window.open('',"_blank",'');
  var obj = document.getElementById(objname);
  winname.document.open('text/html','replace');
  winname.opener = null;
  winname.document.write(obj.value);
  winname.document.close();
}

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