https://developers.weixin.qq.com/miniprogram/dev/devtools/auto/element.html

源码如下：（获的element是小程序中自定义的组件user-card）

page = await miniProgram.reLaunch('/pages/mine/index');
await page.waitFor(2000);
const element = await page.$('user-card');
await element.setData({id: 1345});
await element.callMethod('getExplicitUid');