这是我的代码constructor(arg) {super(arg);this.state = { content: this.props.content.contentType === "common" ? this.props.content.content.slice(0, 4) : null, listIndex: 4, problemType: 'common', events: this.props.ProfessionalProblemList, beginX: null, beginY: null, endX: null, endY: null}};
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