Cookie的创建与清除

   // 存储Cookie
    setCookie (name, value) {
      if (value) {
        var days = 1; //定义一天
        var exp = new Date();
        exp.setTime(exp.getTime() + days * 24 * 60 * 60 * 1000);
        // 写入Cookie, toGMTString将时间转换成字符串
        document.cookie = name + "=" + escape(value) + ";expires=" + exp.toGMTString;
      }
    },
   // 清除所有的Cookie
    clearCookie(){ 
        var keys=document.cookie.match(/[^ =;]+(?=\=)/g); 
        console.log(keys);
        if (keys) { 
            for (var i = keys.length; i--;) 
                document.cookie=keys[i]+'=0;expires=' + new Date( 0).toUTCString() 
            } 
    },