修改state中数组对象某一个字段(state中某个属性为对象或数组时，需要修改该对象中的某一个属性)

this.state = { listData: [ {name: "张三", age: "20"}, {name: "李四", age: "21"}, ], obj: { name: "王五", age: "22", } }

change = (index) => { const listData = [...this.state.listData];   //复制数组--浅拷贝
    const obj = Object.assign({}, this.state.obj, { age: "21" }); this.setState({ listData: listData.map((item, idx) => idx === index ? {...item, name:  "赵六"} : item), obj: obj, }) }