Uncaught TypeError: Invalid attempt to spread non-iterable instance.

1、报错信息：

报错Uncaught TypeError: Invalid attempt to spread non-iterable instance.
In order to be iterable, non-array objects must have a [Symbol.iterator]() method.
    at _nonIterableSpread (OgPanel.js:20:39)
    at _toConsumableArray (OgPanel.js:18:131)
    at handleSearchUser (OgPanel.js:223:1)
    at onSearch (Search.js:72:1)
    at onPressEnter (Search.js:81:1)
    at handleKeyDown (Input.js:136:1)
    at HTMLUnknownElement.callCallback (react-dom.development.js:4164:1)
    at Object.invokeGuardedCallbackDev (react-dom.development.js:4213:1)
    at invokeGuardedCallback (react-dom.development.js:4277:1)
    at invokeGuardedCallbackAndCatchFirstError (react-dom.development.js:4291:1)

　　在setTreeData 中报错

 

解决办法：

1、是因为我的搞错了，我以为[...topObj] 会转成数组。其实不行。

  正确的应该是

setTreeData([...treeData])

 

所以报错的关键就是在于，setTreeData输入的应该是数组，但是输入的不是数组，就会包上面的错误了。