[Vuejs]-Add button value to data on click

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It sounds like the problem is that banknote.amount is a string rather than a number.

If possible you should fix the values in banknotes so that the amount values are all numbers.

If not, you could coerce to a number when performing the addition:

addCashAmount(banknote) {
   this.cash_amount += +banknote.amount
},

Here I’ve used a unary + to perform the coercion. If you prefer a different method, such as calling Number, that should work too:

addCashAmount(banknote) {
   this.cash_amount += Number(banknote.amount)
},

You should also check that the initial value of cash_amount is the number 0 and not the string '0' or the empty string '' as that would cause a similar problem.

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