Use JS regular expressions to replace brackets, angle brackets, etc.

As shown below:

function toTxt(str) { 
  var RexStr = /\<|\>|\"|\&#39;|\&/g 
  str = str.replace(RexStr, function(MatchStr) { 
    switch (MatchStr) { 
    case "<": 
      return "<"; 
      break; 
    case ">": 
      return ">"; 
      break; 
    case "\"": 
      return """; 
      break; 
    case "&#39;": 
      return "&#39;"; 
      break; 
    case "&": 
      return "&"; 
      break; 
    default: 
      break; 
    } 
  }) 
  return str; 
}

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