var n = 1;
function test(){
var n = n+1;
alert(n);
};
test();
var n = 1;
function test(){
var n = n+1;
alert(n);
};
test();var n = 1;
function test(){
var n; // undefined
n = n + 1; // undefined + 1 => NaN
alert(n);
};
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