在调用OCR.bankcard接口中，使用img参数时，let formData = new FormData()时，报错，FormData is not defined
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- Add shipping templates: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Freight Template Management Interface/New Freight Template
- Interface call request specification: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Freight Template Management Interface/New Freight Template
- Request Parameter Sample: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Freight Template Management Interface/New Freight Template
- Return Package Example: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Freight Template Management Interface/New Freight Template
- Request Parameter Dxplaination: 小商店/Development/Capabilities/Commercial capabilities/Trading component/Standard Trading Components and Open Interfaces/Server interface/Freight Template Management Interface/New Freight Template
不支持FormData
参考： https://developers.weixin.qq.com/miniprogram/dev/api/network/upload/wx.uploadFile.html
用uploadFile接口