javascript的html编码函数 (htmlSpecialChars-处理特殊字符)

    function htmlSpecialChars(str)
    {
        str = str.replace(/&/g, ‘&‘);
        str = str.replace(/</g, ‘&lt;‘);
        str = str.replace(/>/g, ‘&gt;‘);
        str = str.replace(/"/g, ‘&quot;‘);
        str = str.replace(/‘/g, ‘'‘);
        return str;
    }  

    //这个版本多转换了一些内容
        function htmlSpecialChars(str)
        {
            var s = "";
            if (str.length == 0) return "";
            for   (var i=0; i<str.length; i++)
            {
                switch (str.substr(i,1))
                {
                    case "<": s += "&lt;"; break;
                    case ">": s += "&gt;"; break;
                    case "&": s += "&amp;"; break;
                    case " ":
                        if(str.substr(i + 1, 1) == " "){
                            s += " &nbsp;";
                            i++;
                        } else s += " ";
                        break;
                    case "\"": s += "&quot;"; break;
                    case "\n": s += "<br>"; break;
                    default: s += str.substr(i,1); break;
                }
            }
            return s;
        }