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var  win1000
var  win1001

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JScript code:
var win1000 = 1;
var win1001 = "a";

alert(eval("win"+1000));
alert(eval("win"+1001));


eval()

eval("win"+1000);
eval("win"+1001);

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function isDigit(s)
{
var patrn=/^[0-9]{1,20}$/;
if (!patrn.exec(s)) return false
return true
}

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