react 报 Uncaught Error: Objects are not valid as a React child (found: object with keys {})

react 报

Uncaught Error: Objects are not valid as a React child (found: object with keys {}). If you meant to render a collection of children, use an array instead.in…
今天碰到了一个react报这个错误的；查找了一下 原来是因为在render的时候 没有点上对象的key名字，

比如：` 

			            {tableData.legendData.map((item: string, index: number) => (
			              

			                {item}
			              
			            ))}
       
`

tableData.legendData里面有个项，是对象（‘{}’）；item没有点上对象的key

    可以写成` 

			            {tableData.legendData.map((item: string, index: number) => (
			              

			                {item || item[对象的key]}
			              
			            ))}
      		
`