JavaScript的HTML编码和解码函数

对字符串进行HTML编码和解码的JS函数，记下来，方便找 :)

编码函数：

function htmlEncode(str) {
     var s = "";
     if (str.length == 0) return "";
     s = str.replace(/&/g, "&");
     s = s.replace(/</g, "&lt;");
     s = s.replace(/>/g, "&gt;");  
     s = s.replace(/\'/g, "&#39;");
     s = s.replace(/\"/g, "&quot;");
     return s;
}

解码函数：

function htmlDecode(str){   
    var s = "";   
    if (str.length == 0) return "";
    s = str.replace(/&/g, "&");
    s = s.replace(/&lt;/g, "<");
    s = s.replace(/&gt;/g, ">"); 
    s = s.replace(/&#39;/g, "\'");   
    s = s.replace(/&quot;/g, "\""); 
    return s;   
}