我们如何只显示选定的月份和年份的输入字段，我选择后的值不显示.选定的月份和年份应该显示.什么似乎是问题？谢谢

的数据
示例值：this.selectedMonthYear 2025年6月

代码

<mat-form-field>
                <input [(ngModel)]="selectedMonthYear" matInput [matDatepicker]="picker" placeholder="Select month" readonly>
                <mat-datepicker-toggle matSuffix [for]="picker"></mat-datepicker-toggle>
                <mat-datepicker #picker startView="multi-year" (monthSelected)="closeStartDatePicker($event, picker)"></mat-datepicker>
              </mat-form-field>

 selectedMonthYear: string = "";

 closeStartDatePicker(normalizedMonth: Date, dp?: any) {
      // Format the selected month and year
      // this.selectedMonthYear = normalizedMonth
      this.selectedMonthYear = this.formatMonthYear(normalizedMonth);
      console.log(" this.selectedMonthYear" ,  this.selectedMonthYear)
      // console.log('this.selectedMonthYear' ,)
      // Close the datepicker
      dp.close();
  }

  private formatMonthYear(date: Date): string {
    const month = date.toLocaleString('en-us', { month: 'long' });
    const year = date.getFullYear();
    return `${month} ${year}`;

字符串