[Note] how small the value of the variable names do with variables

Today, I encountered such a demand at the time of writing code - need to add a variable to the variable name.

At this time we can use eval () function.

The eval js () function computes a string, and executes the JavaScript code.

Chestnuts as follows:

{
   xxx.map((item, index) => {
       return <ScrollView onLayout={event => { eval(`agencyY${index} = event.nativeEvent.layout.y`) }} key={index}> 
            blabla~~~
        </ScrollView>
    }) 
}    

The above code eval ( `agencyY $ {index} = event.nativeEvent.layout.y`), equivalent defined agencyY0 = event.nativeEvent.layout.y, agencyY1 = event.nativeEvent.layout.y, ......... ...

 

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