从输入字段读取属性时，HTML编码丢失

#7 楼

function escapeHTML (str)
{
    var div = document.createElement('div');
    var text = document.createTextNode(str);
    div.appendChild(text);
    return div.innerHTML;
}

#8 楼

#9 楼

function encode(e){return e.replace(/[^]/g,function(e){return"&#"+e.charCodeAt(0)+";"})}

 function encode(r){
return r.replace(/[\x26\x0A\<>'"]/g,function(r){return"&#"+r.charCodeAt(0)+";"})
}

test.value=encode('Encode HTML entities!\n\n"Safe" escape <script id=\'\'> & useful in <pre> tags!');

testing.innerHTML=test.value;

/*************
* \x26 is &ampersand (it has to be first),
* \x0A is newline,
*************/ 

 <textarea id=test rows="9" cols="55"></textarea>

<div id="testing">www.WHAK.com</div> 

#10 楼

'<div class="article">This is an article</div>'.escapeHTML();
// -> "&lt;div class="article"&gt;This is an article&lt;/div&gt;"

#11 楼

String.prototype.HTMLEncode = function(str) {
  var result = "";
  var str = (arguments.length===1) ? str : this;
  for(var i=0; i<str.length; i++) {
     var chrcode = str.charCodeAt(i);
     result+=(chrcode>128) ? "&#"+chrcode+";" : str.substr(i,1)
   }
   return result;
}
// TEST
console.log("stetaewteaw æø".HTMLEncode());
console.log("stetaewteaw æø".HTMLEncode("æåøåæå"))

#12 楼

// ref: https://github.com/angular/angular.js/blob/v1.3.14/src/ngSanitize/sanitize.js
const SURROGATE_PAIR_REGEXP = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
const NON_ALPHANUMERIC_REGEXP = /([^\#-~| |!])/g;

const decodeElem = document.createElement('pre');


/**
 * Decodes html encoded text, so that the actual string may
 * be used.
 * @param value
 * @returns {string} decoded text
 */
export function decode(value) {
  if (!value) return '';
  decodeElem.innerHTML = value.replace(/</g, '&lt;');
  return decodeElem.textContent;
}


/**
 * Encodes all potentially dangerous characters, so that the
 * resulting string can be safely inserted into attribute or
 * element text.
 * @param value
 * @returns {string} encoded text
 */
export function encode(value) {
  if (value === null || value === undefined) return '';
  return String(value).
    replace(/&/g, '&amp;').
    replace(SURROGATE_PAIR_REGEXP, value => {
      var hi = value.charCodeAt(0);
      var low = value.charCodeAt(1);
      return '&#' + (((hi - 0xD800) * 0x400) + (low - 0xDC00) + 0x10000) + ';';
    }).
    replace(NON_ALPHANUMERIC_REGEXP, value => {
      return '&#' + value.charCodeAt(0) + ';';
    }).
    replace(/</g, '&lt;').
    replace(/>/g, '&gt;');
}

export default {encode,decode};

#13 楼

var helper = $('chalk & cheese').hide().appendTo('body');
var htmled = helper.html();
helper.remove();

#14 楼

<form>
 <input id="button" type="button" value="Click me">
 <input type="hidden" id="hiddenId" name="hiddenId" value="I like cheese">
 <input type="text" id="output" name="output">
</form>
<script>
    $(document).ready(function(e) {
        $('#button').click(function(e) {
            $('#output').val($('#hiddenId').val());
        });
    });
</script>

$box = $('<input type="text" name="whatever">').val($('#hiddenId').val());

#15 楼

<input id='hiddenId' type='hidden' value='chalk & cheese' />

encodeURIComponent($('#hiddenId').attr('value'))

encodeURIComponent('name/surname')

#16 楼

 function htmlEncode(s) {
  var ntable = {
    "&": "amp",
    "<": "lt",
    ">": "gt",
    "\"": "quot"
  };
  s = s.replace(/[&<>"]/g, function(ch) {
    return "&" + ntable[ch] + ";";
  })
  s = s.replace(/[^ -\x7e]/g, function(ch) {
    return "&#" + ch.charCodeAt(0).toString() + ";";
  });
  return s;
} 

#17 楼

/**
 * HTML entities encode
 *
 * @param {string} str Input text
 * @return {string} Filtered text
 */
function htmlencode (str){

  var div = document.createElement('div');
  div.appendChild(document.createTextNode(str));
  return div.innerHTML;
}

#18 楼

#19 楼

var htmlEnDeCode = (function() {
    var charToEntityRegex,
        entityToCharRegex,
        charToEntity,
        entityToChar;

    function resetCharacterEntities() {
        charToEntity = {};
        entityToChar = {};
        // add the default set
        addCharacterEntities({
            '&'     :   '&',
            '>'      :   '>',
            '&lt;'      :   '<',
            '&quot;'    :   '"',
            '&#39;'     :   "'"
        });
    }

    function addCharacterEntities(newEntities) {
        var charKeys = [],
            entityKeys = [],
            key, echar;
        for (key in newEntities) {
            echar = newEntities[key];
            entityToChar[key] = echar;
            charToEntity[echar] = key;
            charKeys.push(echar);
            entityKeys.push(key);
        }
        charToEntityRegex = new RegExp('(' + charKeys.join('|') + ')', 'g');
        entityToCharRegex = new RegExp('(' + entityKeys.join('|') + '|&#[0-9]{1,5};' + ')', 'g');
    }

    function htmlEncode(value){
        var htmlEncodeReplaceFn = function(match, capture) {
            return charToEntity[capture];
        };

        return (!value) ? value : String(value).replace(charToEntityRegex, htmlEncodeReplaceFn);
    }

    function htmlDecode(value) {
        var htmlDecodeReplaceFn = function(match, capture) {
            return (capture in entityToChar) ? entityToChar[capture] : String.fromCharCode(parseInt(capture.substr(2), 10));
        };

        return (!value) ? value : String(value).replace(entityToCharRegex, htmlDecodeReplaceFn);
    }

    resetCharacterEntities();

    return {
        htmlEncode: htmlEncode,
        htmlDecode: htmlDecode
    };
})();

#20 楼

<script>
String.prototype.htmlEncode = function () {
    return String(this)
        .replace(/&/g, '&amp;')
        .replace(/"/g, '&quot;')
        .replace(/'/g, '&#39;')
        .replace(/</g, '&lt;')
        .replace(/>/g, '&gt;');

}

var aString = '<script>alert("I hack your site")</script>';
console.log(aString.htmlEncode());
</script>

#21 楼

  var htmlEncodeContainer = $('<div />');
  function htmlEncode(value) {
    if (value) {
      return htmlEncodeContainer.text(value).html();
    } else {
      return '';
    }
  }

#22 楼

.replace(/\/g, '\')

#23 楼

String.prototype.escapeHTML = function() { 
    return this.replace(/&/g,'&amp;').replace(/</g,'&lt;').replace(/>/g,'&gt;')
}

var escapedString = "<h1>this is HTML</h1>".escapeHTML();
// gives: "&lt;h1&gt;this is HTML&lt;/h1&gt;"

#24 楼

 window.encodeHTML = (function() {
    function escapeRegex(s) {
        return s.replace(/[-\/\^$*+?.()|[\]{}]/g, '\$&');
    }
    var encodings = {
        '&'  : '&',
        '"'  : '"',
        '\'' : ''',
        '<'  : '&lt;',
        '>'  : '&gt;',
        '\' : '&#x2F;'
    };
    function encode(what) { return encodings[what]; };
    var specialChars = new RegExp('[' +
        escapeRegex(Object.keys(encodings).join('')) +
    ']', 'g');

    return function(text) { return text.replace(specialChars, encode); };
})();
  
 
已经运行了一次，现在可以调用
 
 
 encodeHTML('<>&"\'')
 
 
 
获取&lt;&gt;&amp;&quot;&#39; 

#25 楼

 function encodeHTML(str) {
    return document.createElement("a").appendChild( 
        document.createTextNode(str)).parentNode.innerHTML;
};

function decodeHTML(str) {
    var element = document.createElement("a"); 
    element.innerHTML = str;
    return element.textContent;
};
var str = "<"
var enc = encodeHTML(str);
var dec = decodeHTML(enc);
console.log("str: " + str, "\nenc: " + enc, "\ndec: " + dec);