get beans() {
return this.validateForm.get('beans') as FormArray;
}
change(fromIdx, toIdx){
const formGroup = this.beans.at(fromIdx);
this.beans.removeAt(fromIdx);
this.beans.insert(toIdx, formGroup);
}
trackByFn(index: any, item: any) {
return index;
}
同时需要在ng-for循环部分增加trackBy
*ngFor="let item of beans.controls; let i = index; trackBy:trackByFn"
标签：index,fromIdx,toIdx,位置,FormArray,trackBy,beans,调整 From： https://www.cnblogs.com/MainActivity/p/16665612.html