看一下小程序语法官网 双向绑定暂不支持a.b这种形式 只支持a,b这种 [https://developers.weixin.qq.com/miniprogram/dev/framework/view/two-way-bindings.html](https://link.segmentfault.com/?enc=GYDJ7ZPOfYNjhym0rqofAw%3D%3D.ZaBShniPMbU3SB1nFpWI0oN57Yi2VpDomRZUjUmcUmUXq%2BWZoRPFSZTof7z81I%2F%2BGFsuxCtT6Q2Qx27NqrSckuBmfBer2bptiJwa1V8UZi3K3a3GYKZu%2BzI3C14helJF)