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老师，这样是不是也可以

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藤虎一笑解千愁

#1 Created at ... [Delete] [Delete and Lock User] 
function counter(initial){
    var x = initial || 0;
    return (
        function(){
        x += 1;
        return x;
        }   
    )
}
c = counter();
alert(c());
alert(c());
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