如何传递字符串并将其用作变量名？

Question

I have a variable such as:

var startX = 20
var startY = 30

I want to call a function such as:

onClick="myFunction('startX')"
or
onClick="myFunction('startY')"

myFunction(passedVar){
}

So passedVar = 'startX' or 'startY' and I then need to reference the variable of the same name and get it's value (20 or 30)

In Powershell I'd do a:

get-variable($passedVar) -value

which would see what's in passedVar and then look for a variable with that name and give me the value.

Does that make sense?

Thanks!

Answer 1

Global variables are just properties of the window object. You could try

var val = window[passedVar];

Answer 2

You simply have to omit the single quotes; it is not required.

onClick="myFunction(startX)" or onClick="myFunction(startY)"