jquery - toFixed method doesn't work on user input but works on other vars in javascript, snippet included -


i wanted feedback on why tofixed not work in js alert when attached user input var usergb. curious thing. i've been encouraged post , did not see other questions out here regarding tofixed issues user-input vars.

var downloadspeed = function () {         var usergb = prompt("how many gigabytes wish download @ 56 kilobits per second?");         console.log(usergb);         var hours = (usergb*8388608)/201600;         console.log(hours);         var days = (usergb*8388608)/4838400;         console.log(days);      //below in alert see it, after first concatenated string, i'd type usergb.tofixed(2) won't take.           alert("the number of hours take download " + usergb + " gb file @ 56 kilobits per second " + hours.tofixed(2) + " hours. might big number. so, in terms of days download, it'll take "  + days.tofixed(2) + " days download. why have faster broadband speeds nowadays , why have video streaming.");      }     downloadspeed();

the error is not function.

grazie, lou

you need cast input number:

var usergb = +prompt("how many gigabytes wish download @ 56 kilobits per second?");

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