React + componentdidupdate + setstate

 在componentDidUpdate中直接使用this.setState()方法报错

 Maximum update depth exceeded. This can happen when a component repeatedly calls setState inside componentWillUpdate or componentDidUpdate. React limits the number of nested updates to prevent infinite loops.

超过了最大更新深度。当组件在componentWillUpdate或componentDidUpdate中重复调用setState时，可能会发生这种情况。React限制嵌套更新的数量，以防止无限循环。

具体报错原因我也不清楚，有懂哥可以指点指点

componentDidUpdate() { 
            if (this.props.sonprops.history.location.pathname === '/report/group') {
                this.setState({ openItems: ['1'] })
            } else if (this.props.sonprops.history.location.pathname === '/report/company') {
                this.setState({ openItems: ['2'] })
            } else if (this.props.sonprops.history.location.pathname === '/report/department') {
                this.setState({ openItems: ['3'] })
            } else if (this.props.sonprops.history.location.pathname === '/report/project') {
                this.setState({ openItems: ['4'] })
            } else if (this.props.sonprops.history.location.pathname === '/report/person') {
                this.setState({ openItems: ['5'] })
            } else {

            } 
    }

 最后是在外层套一个setTimeout()就解决了，具体原理我也不懂