react 修改state为对象中的某一个属性值

  state={
    payAmount:0,
    coursewareName:'',
    orderInfo:{}
  }

let data = Object.assign({}, this.state.orderInfo, { payMethod: value })
 console.log("data debugger",data)
    debugger
    this.setState({
      orderInfo: data
    })
    console.log("data",data)
    console.log("orderInfo",this.state.orderInfo)
    console.log("payMethod",this.state.orderInfo.payMethod)

但是结果

红绿.png

红框里有属性payMethod,绿框的美原油

data debugger中有

datadebugger.png
data有这个属性,但是
this.state.orderInfo没有这个属性
this.state.orderInfo.payMethodundefined