一个速度优化版本:

function escapeHtml(s) { let out = ""; let p2 = 0; for (let p = 0; p < s.length; p++) { let r; switch (s.charCodeAt(p)) { case 34: r = "&quot;"; break; // " case 38: r = "&amp;" ; break; // & case 39: r = "&#39;" ; break; // ' case 60: r = '&lt;' ; break; // < case 62: r = '&gt;' ; break; // > default: continue; } if (p2 < p) { out += s.substring(p2, p); } out += r; p2 = p + 1; } if (p2 == 0) { return s; } if (p2 < s.length) { out += s.substring(p2); } return out; } const s = "Hello <World>!"; document.write(escapeHtml(s)); console.log(escapeHtml(s));

试着强调。它与jQuery一起工作。

_.str.escapeHTML('<div>Blah blah blah</div>')

输出:

'<div>Blah blah blah</div>'

如果你不防止再次逃逸，所有的解决方案都是无用的，例如，大多数解决方案将继续逃逸&到&

escapeHtml = function (s) {
    return s ? s.replace(
        /[&<>'"]/g,
        function (c, offset, str) {
            if (c === "&") {
                var substr = str.substring(offset, offset + 6);
                if (/&(amp|lt|gt|apos|quot);/.test(substr)) {
                    // already escaped, do not re-escape
                    return c;
                }
            }
            return "&" + {
                "&": "amp",
                "<": "lt",
                ">": "gt",
                "'": "apos",
                '"': "quot"
            }[c] + ";";
        }
    ) : "";
};

转义html特殊(UTF-8)

function htmlEscape(str) {
  return str
      .replace(/&/g, '&')
      .replace(/"/g, '"')
      .replace(/'/g, ''')
      .replace(/</g, '&lt;')
      .replace(/>/g, '&gt;')
      .replace(/\//g, '&#x2F;')
      .replace(/=/g,  '&#x3D;')
      .replace(/`/g, '&#x60;');
}

对于unescape html特殊(UTF-8)

function htmlUnescape(str) {
  return str
      .replace(/&/g, '&')
      .replace(/"/g, '"')
      .replace(/'/g, "'")
      .replace(/&lt;/g, '<')
      .replace(/&gt;/g, '>')
      .replace(/&#x2F/g, '/')
      .replace(/&#x3D;/g, '=')
      .replace(/&#x60;/g, '`');
}

(function(undefined){
    var charsToReplace = {
        '&': '&',
        '<': '&lt;',
        '>': '&gt;'
    };

    var replaceReg = new RegExp("[" + Object.keys(charsToReplace).join("") + "]", "g");
    var replaceFn = function(tag){ return charsToReplace[tag] || tag; };

    var replaceRegF = function(replaceMap) {
        return (new RegExp("[" + Object.keys(charsToReplace).concat(Object.keys(replaceMap)).join("") + "]", "gi"));
    };
    var replaceFnF = function(replaceMap) {
        return function(tag){ return replaceMap[tag] || charsToReplace[tag] || tag; };
    };

    String.prototype.htmlEscape = function(replaceMap) {
        if (replaceMap === undefined) return this.replace(replaceReg, replaceFn);
        return this.replace(replaceRegF(replaceMap), replaceFnF(replaceMap));
    };
})();

没有全局变量，一些内存优化。 用法:

"some<tag>and&symbol©".htmlEscape({'©': '&copy;'})

结果是:

"some<tag>and&symbol©"

如果你走的是正则表达式路线，上面tghw的例子中就有一个错误。

<!-- WON'T WORK -  item[0] is an index, not an item -->

var escaped = html; 
var findReplace = [[/&/g, "&amp;"], [/</g, "&lt;"], [/>/g,"&gt;"], [/"/g,
"&quot;"]]

for(var item in findReplace) {
     escaped = escaped.replace(item[0], item[1]);   
}


<!-- WORKS - findReplace[item[]] correctly references contents -->

var escaped = html;
var findReplace = [[/&/g, "&amp;"], [/</g, "&lt;"], [/>/g, "&gt;"], [/"/g, "&quot;"]]

for(var item in findReplace) {
     escaped = escaped.replace(findReplace[item[0]], findReplace[item[1]]);
}