this is my code
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
}};
ie, you need to modify this.props to arg, that is, the parameter declared in super
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