這是一個使用JWT登錄的案例： ``` document.querySelector('#sub-btn').onclick = function() { let username = document.querySelector('#username').value; let password = document.querySelector('#password').value; var params = new URLSearchParams(); params.append('user', username); params.append('pass', password); axios.post( 'user.php?action=login', params ) .then((response) => { if (response.data.result === 'success') { // 本地存儲token localStorage.setItem('jwt', response.data.jwt); // 把token加入header里 axios.defaults.headers.common['X-token'] = response.data.jwt; axios.get('user.php').then(function(response) { if (response.data.result === 'success') { document.querySelector('#showpage').style.display = 'none'; document.querySelector('#user').style.display = 'block'; document.querySelector('#uname').innerHTML = response.data.info.data.username; } else { console.log('登錄失敗'); } }); } else { console.log(response.data.msg); } }).catch(function (error) { console.log(error); }); } ```