删除所有cookie

1.  clearAllCookies() {

                       var keys = document.cookie.match(/[^ =;]+(?=\=)/g);

                       if (keys) {

                           for (var i = keys.length; i--;)

                               document.cookie = keys[i] + '=0;expires=' + new Date(0).toUTCString()

                       }

                       window.location.href = "index.html";

                   },