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leantodo-weapp 中的代码 感觉这块有点复杂, 能大概说下是干什么的吗? login: function() { return AV.Promise.resolve(AV.User.current()).then(user => user ? (user.isAuthenticated().then(authed => authed ? user : null)) : null ).then(user => user ? user : AV.User.loginWithWeapp()).catch(error => consolo.error(error.m…