Vue project @change multiple parameters to pass multiple events

First, there is only one change event.

 changelevel() //Select value

If you want to change the select and change the value in the row

Multiple events are separated by

At this time, it is found that changelevel() is not executed, so what about adding ()

 changelevel(val){ console.log(val) => //undefined}

Indicates that no parameters are passed and output is undefined

So who should we pass the value to?

Pass in $event and output it again to get the selected value

Added: element-ui @change adds custom parameters

The default parameter of the change event of element-ui is a value. For example, the default parameter of the change event of the drop-down box is the selected value. However, in actual projects, we usually need to pass more than one parameter. If we directly append two parameters, we may not get them. In this case, we need to replace the default parameter name in the parameter with $event.

//The first parameter is the default value parameter, and the second is the parameter we want to pass in

 @change='selectChange($event,scope.row)'

Or use the second method:

 @change='(val)=>selectChange(value,scope.row)'

The above is my personal experience. I hope it can give you a reference. I also hope that you will support 123WORDPRESS.COM. If there are any mistakes or incomplete considerations, please feel free to correct me.