How can i get array key-values pair using javascript -

- 

for(i=0;i<=array_values.length;i++){     var a=array_values[i].amounts;     var t=array_values[i].tax;     alert(a);     alert(t);  }

error : typeerror: array_values[i] undefined

var a=array_values[i].amounts; var a=array_values[i].amounts;

change

for(i=0;i<=array_values.length;i++)

to 

for(i=0;i<array_values.length;i++)

<= <


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