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请问下列代码中| 符号起什么作用呢？sectionID: ?number | string又是什么意思呢？
    renderRow: function( item: Object, sectionID: number | string, // |符号作用 是分割还是转化？ rowID: number | string, highlightRowFunc: ... ?number | string, rowID: ?number | string) => void, )...
asked Feb 19, 2021 in Technique[技术] by 深蓝 (71.8m points)
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