在代碼中。我必須以反應形式設置控件的值。ngDoCheck() {   setControlValues();}ngChanges(changes: SimpleChanges): void {   setControlValues();}private setControlValues() {   try {   theForm.Controls['class'].setValue(myValue); //error happens here   // ...many controls   }   catch(e) {      console.log(e);   }}但是我得到了例外。無法在 eval (forms.js:4852) at(forms.js:4873) at eval(forms.js.4793) at Array.forEach() at FormGroup._forEachChild 處讀取未定義的屬性“已啟用”..... .at FormControl.AbstractControl.updateValueAndValidity (forms.js: 3393)表格定義為theForm: FormGroup;constructor(private fb: FormBuilder) {    this.useForm = this.fb.group({    class: [null] });}我的 html 是：<texearea kendoYextArea     formControlName="class" required></textarea>更新：我發(fā)現(xiàn)庫中的 forms.js 代碼如下。 AbstractControl.prototype.updateValueAndValidty = function(opts) {    if(opts == void 0) { opts = {}; }    this._setInitialStatus();    if(this.enabled ) {        this._cancelExistingSubscription();