// js 遍历所有Cookiefunction foreach(){  var strCookie=document.cookie;  var arrCookie=strCookie.split("; "); // 将多cookie切割为多个名/值对  for(var i=0;i
     
      0)  DelCookie(arr[0]);}   }function GetCookieVal(offset)   {var endstr = document.cookie.indexOf (";", offset);if (endstr == -1)endstr = document.cookie.length;return decodeURIComponent(document.cookie.substring(offset, endstr));}function DelCookie(name){var exp = new Date();exp.setTime (exp.getTime() - 1);var cval = GetCookie (name);document.cookie = name + "=" + cval + "; expires="+ exp.toGMTString();} function GetCookie(name){var arg = name + "=";var alen = arg.length;var clen = document.cookie.length;var i = 0;while (i < clen){var j = i + alen;if (document.cookie.substring(i, j) == arg)return GetCookieVal (j);i = document.cookie.indexOf(" ", i) + 1;if (i == 0) break;}return null;}
     

　　转载自：http://blog.csdn.net/xiaona1047985204/article/details/6700931