jquery - replace character at certain position inside javascript -

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this question has answer here:

if have string inside javascript function like

function somefunction(){    var mystr = "12345678911";    var maskedstr = "";        }

how can use mystr values * maskedstr contain string like

var maskedstr = "1234567*91*";  

function somefunction(){    var mystr = "12345678911";    var maskedstr = mystr.replace("9", "*");        }

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