How to trigger the "click" event using javascript in LC8?

[Macau_fan]

I have 2 button in the form. I don't want the user to click the button1 directly (invisible now). but I want the user click the button2 and then do some checking. after checking is finisined,  the script will continue to trigger the button1 "click" event. How to trigger the button1 "click" event through javascript in LC 8? Thanks.

[Macau_fan]

button2.execevent("click");