JS type conversion bugs
Even if type = "number" is specified in the HTML input input input box, it often occurs that the value obtained by V-model is a string.
Thus, in the numerical calculation logic, add number to string will cause bug.
> 100 + "2.35" "1002.35"
What we expect is:
> 100 + 2.35 102.35
In money related calculations, this is very dangerous.
Therefore, you have to use parsefloat() or number() to convert strings.
Vuejs automatic conversion
<input v-model.number="price" type="number">
This is much more convenient.
A similar feature is v-model.trim.
Reference for reference