User logs in to obtain Token

# Obtain temporary credentials code **Sample code:** ```javascript tt.login({ success(res) { console.log(`Login call successful ${res.code} ${res.anonymousCode}`); }, fail(res) { console.log(`login call failed`); } }); ``` # Cloud development calls login interface ```javascript TTAPI.login_tt(code).then(apiResult => { console.log(apiResult); // The login interface returns data, which contains token uid openid }) ``` After successful login, please save the token in the mobile phone storage. Subsequent operations on user-related cloud development interfaces require the token.