Angular2: disabled input

<input [disabled]="!checkedIndex" type="checkbox">

或者

<input [attr.disabled]="!checkedIndex?'':null" type="checkbox">

或者

<input [disabled]="!checkedIndex?'':null" type="checkbox">

 

参考：

https://stackoverflow.com/questions/46105190/input-disabled-on-true-false-statement-angular-2

https://stackoverflow.com/questions/35434900/switch-disabled-on-input-with-angular-2