简单。得更快。

function deleteAllCookies() {
 var c = document.cookie.split("; ");
 for (i in c) 
  document.cookie =/^[^=]+/.exec(c[i])[0]+"=;expires=Thu, 01 Jan 1970 00:00:00 GMT";    
}

我在这里贡献是因为这个功能将允许您删除所有cookie(匹配路径，默认为no-path或\)，也包括设置为包含在子域上的cookie

function clearCookies( wildcardDomain=false, primaryDomain=true, path=null ){
  pathSegment = path ? '; path=' + path : ''
  expSegment = "=;expires=Thu, 01 Jan 1970 00:00:00 GMT"
  document.cookie.split(';').forEach(
    function(c) { 
      primaryDomain && (document.cookie = c.replace(/^ +/, "").replace(/=.*/, expSegment + pathSegment))
      wildcardDomain && (document.cookie = c.replace(/^ +/, "").replace(/=.*/, expSegment + pathSegment + '; domain=' + document.domain))
    }
  )
} 

如果你有jquery的访问。Cookie插件，你可以用这种方式删除所有的Cookie:

for (var it in $.cookie()) $.removeCookie(it);

我有一些更复杂和面向oop的cookie控制模块。它还包含deleteAll方法来清除所有现有的cookie。请注意，这个版本的deleteAll方法有设置path=/，这会导致删除当前域中的所有cookie。如果你只需要从某些范围删除cookie，你将不得不升级这个方法，我添加动态路径参数到这个方法。

主要有Cookie类:

import {Setter} from './Setter';

export class Cookie {
    /**
     * @param {string} key
     * @return {string|undefined}
     */
    static get(key) {
        key = key.replace(/([\.$?*|{}\(\)\[\]\\\/\+^])/g, '\\$1');

        const regExp = new RegExp('(?:^|; )' + key + '=([^;]*)');
        const matches = document.cookie.match(regExp);

        return matches
            ? decodeURIComponent(matches[1])
            : undefined;
    }

    /**
     * @param {string} name
     */
    static delete(name) {
        this.set(name, '', { expires: -1 });
    }

    static deleteAll() {
        const cookies = document.cookie.split('; ');

        for (let cookie of cookies) {
            const index = cookie.indexOf('=');

            const name = ~index
                ? cookie.substr(0, index)
                : cookie;

            document.cookie = name + '=;expires=Thu, 01 Jan 1970 00:00:00 GMT;path=/';
        }
    }

    /**
     * @param {string} name
     * @param {string|boolean} value
     * @param {{expires?:Date|string|number,path?:string,domain?:string,secure?:boolean}} opts
     */
    static set(name, value, opts = {}) {
        Setter.set(name, value, opts);
    }
}

Cookie setter方法(Cookie.set)相当复杂，所以我把它分解到其他类中。这里有一个代码:

export class Setter {
    /**
     * @param {string} name
     * @param {string|boolean} value
     * @param {{expires?:Date|string|number,path?:string,domain?:string,secure?:boolean}} opts
     */
    static set(name, value, opts = {}) {
        value = Setter.prepareValue(value);
        opts = Setter.prepareOpts(opts);

        let updatedCookie = name + '=' + value;

        for (let i in opts) {
            if (!opts.hasOwnProperty(i)) continue;

            updatedCookie += '; ' + i;

            const value = opts[i];

            if (value !== true)
                updatedCookie += '=' + value;
        }

        document.cookie = updatedCookie;
    }

    /**
     * @param {string} value
     * @return {string}
     * @private
     */
    static prepareValue(value) {
        return encodeURIComponent(value);
    }

    /**
     * @param {{expires?:Date|string|number,path?:string,domain?:string,secure?:boolean}} opts
     * @private
     */
    static prepareOpts(opts = {}) {
        opts = Object.assign({}, opts);

        let {expires} = opts;

        if (typeof expires == 'number' && expires) {
            const date = new Date();

            date.setTime(date.getTime() + expires * 1000);

            expires = opts.expires = date;
        }

        if (expires && expires.toUTCString)
            opts.expires = expires.toUTCString();

        return opts;
    }
}

我们可以这样做:

deleteAllCookies=()=>
      {
      let c=document.cookie.split(';')
      for(const k of c)
         {
         let s=k.split('=')
         document.cookie=s[0].trim()+'=;expires=Fri, 20 Aug 2021 00:00:00 UTC'
         }
      }

用法:

deleteAllCookies()

截止日期是这个答案之前的任意一天;它可以是当天之前的任何日期 在JS中，你不能基于路径读取cookie 在JS中，你只能设置或获取cookie

函数方法+ ES6

const cookieCleaner = () => {
  return document.cookie.split(";").reduce(function (acc, cookie) {
    const eqPos = cookie.indexOf("=");
    const cleanCookie = `${cookie.substr(0, eqPos)}=;expires=Thu, 01 Jan 1970 00:00:00 GMT;`;
    return `${acc}${cleanCookie}`;
  }, "");
}

注意:不处理路径