JavaScript操作Cookie方法实例分析

 // My methods for setting, reading and deleting cookies. // I have methods to check for the existence of cookie names or values, // to retrieve by name or value, and to create a formatted string of // all the cookies. // My site: andrew.dx.am var SetCookie = function (name, value, expires, path, domain, secure) { // The caller should Trim the name/value pair, if required. // Sets the name/value pair (encoded); 'expires' is the no. of days. var expires_date; if (expires) { expires_date = new Date(); expires_date.setDate(expires_date.getDate() + expires); } document.cookie = encodeURIComponent(name) + "=" + encodeURIComponent(value) + ( ( expires ) ? ";expires=" + expires_date.toUTCString() : "" ) + ( ( path ) ? ";path=" + path : "" ) + ( ( domain ) ? ";domain=" + domain : "" ) + ( ( secure ) ? ";secure" : "" ); }; var DeleteCookie = function (name, path, domain) { // The caller should Trim the name/value pair. // Encodes the name before deleting. document.cookie = encodeURIComponent(name) + "=" + ( ( path ) ? ";path=" + path : "") + ( ( domain ) ? ";domain=" + domain : "" ) + ";expires=Fri, 01-Jan-2010 00:00:01 UTC"; }; var DelAllCookies = function () { var currDate = new Date(), i, theCookie = document.cookie.split(";"); currDate = currDate.toUTCString(); i = theCookie.length; while ( i-- ) { document.cookie = theCookie[i] + "; expires =" + currDate; } }; var EscapeReg = function (str) { // Helper fn: Escapes characters for use in a regular expression. return str.replace(/[-[\]{}()*+?.,\\^$|#\s]/g, "\\$&"); }; // The following four functions do not Trim the name or value // - the calling fns should do this. var CNameExists = function (cookie_name) { // case-insensitive var testName, myReg; if (document.cookie.length == 0) return false; testName = EscapeReg(cookie_name); myReg = new RegExp('(^|;) ?' + testName + '=([^;]*)(;|$)','i'); return myReg.test(decodeURIComponent(document.cookie)); }; var CValueExists = function (cookie_value)  { // case insensitive var testName, myReg; if (document.cookie.length == 0) return false; testName = EscapeReg(cookie_value); myReg = new RegExp('(=)' + testName + '(;|$)','i'); return myReg.test(decodeURIComponent(document.cookie)); }; var CNameGet = function (cookie_value) { // case-insensitive var testName, myReg, results; if (document.cookie.length == 0) return ''; testName = EscapeReg(cookie_value); myReg = new RegExp('(^|;) ?([^=]*)=' + testName + '(;|$)','i'); results = decodeURIComponent(document.cookie).match(myReg); return ( results ) ? results[2] : ''; }; var CValueGet = function (cookie_name) { // case-insensitive var testName, myReg, results; if (document.cookie.length == 0) return ''; testName = EscapeReg(cookie_name); myReg = new RegExp('(^|;) ?' + testName + '=([^;]*)(;|$)','i'); results = decodeURIComponent(document.cookie).match(myReg); return ( results ) ? results[2] : ''; }; var CookieStr = function () { // Returns a string (with line breaks) which could be // placed in, for example, a textarea. return decodeURIComponent(document.cookie). replace(/([^=;]+)=([^;]*)[;\s]*/g,'$1 ($2)\n') || ''; };