SOURCE

function zhuanyi(str) {
  var div = document.createElement('div');
  // (div.textContent != null) ? (div.textContent = str) : (div.innerText = str);
  
  div.innerText = str;
  var res = div.innerHTML;
  div = null;
  return res;
}

var test = zhuanyi('<script>');
console.log(test)