保存：

// 登录

            login() {

                if (this.username === "" || this.password === "") {

                    alert("输入框不能为空")

                } else {

                    axios.post('/login/', {

                        username: this.username,

                        password: this.password

                    }).then(response => {

                        if (response.data['code'] == ) {

                            alert("登录成功")

                            sessionStorage.setItem('username', this.username)

                            window.location.href = "index/"

                        } else if (response.data['code'] == ) {

                            alert("账号或者密码错误")

                        }

                    }).catch(error => {

                        console.log(error)

                        alert("请求异常")

                    })

                }

            }

跳转后输出：

<script>

    new Vue({

        el: '#app',

        data: {

        },

        // 实例创建后执行

        created() {

            let myName=sessionStorage.getItem("username");

            console.log("-----created-----", myName)

        },

    })

    console.log(myName)

</script>