用canIUse试了setData.callback, setData().callback, Page.prototype.setData().callback都进不了true，基础库1.5.2
方法参数的兼容，感觉跟示例里wx.showModal的兼容写法又有些区别
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- Callback Back Sample: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Event callback access process: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/Event callback access process
- Callback request parameter example: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback request parameter explaination: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
- Callback return parameter specification: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Custom trading components and open interfaces/Event callback/User Coupon Callback
这个应该不能用 wx.canIUse() 来判断了吧，它是来判断 wx. 开头的新增方法的，setData() 不是。
非要判断的话可以用 wx.getSystemInfo() 来获取一次 SDKVersion，自行处理一下版本号，大于等于 1.5.0 的就支持。