document.onkeydown = (event) => {

    var e = event || window.event;

    if(e && e.keyCode==13){ // enter 键

          function(){...}

     }

};

　　　　　　　　　　　　<form @keyup.enter="login">

                        <div class="uname-box clearfloat">

                            <span class="icon_box user_icon"></span>

                            <input type="text" name="" placeholder="手机号" v-model="uName" />

                        </div>

                        <div class="upwd-box clearfloat">

                            <span class="icon_box pwd_icon"></span>

                            <input type="password" name="" placeholder="密码" v-model="uPwd" />

                        </div>

                        <div id="login" @click="login">登录</div>

                    </form>