js 清空当前网址所有cookie

网上找了些代码，有些成功率不高。修改了一些，测试成功率可以99%。

function foreach(){  var strCookie=document.cookie;  var arrCookie=strCookie.split("; ");  for(var i=0;i<arrCookie.length;i++) {    var arr=arrCookie[i].split("=");    if(arr.length>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;}function clearCookie(){    var date=new Date();    date.setTime(date.getTime()-10000);    var keys=document.cookie.match(/[^ =;]+(?=\=)/g);    if (keys) {        for (var i =  keys.length; i--;)          document.cookie=keys[i]+"=0; expire="+date.toGMTString()+"; path=/";    }}clearCookie();