javascript - parseFloat.toPreceision just adds zeros -

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i'm sending number/string 0.001 function below:

significantfigures = 4; function limitnumberofdigits(num) {     var tempstr = "";     if (isnan(num))         return "\xd8";     else{         if (parsefloat(num) === 0 || (num.tostring().indexof('.') === -1 && parseint(num) < 9999) || num.tostring().length <= 4) {             return num;         }         tempstr = parsefloat(num).toprecision(significantfigures);         if (tempstr.indexof("e") > -1) {             var starte = tempstr.indexof("e");             var ende = 0;             (var = starte +2 ; < tempstr.length; i++ ) { // + ignore e , sign (+ or - )                 if(parseint(tempstr[i], 10) > 0) {                     ende = i;                 }else {                     break;                 }             }             if (starte + 2 === ende) {                 var pow = tempstr[ende];             } else {                 var pow = tempstr.substring(starte +2 ,ende);             }             return tempstr.substring(0,starte) + "*10<sup>"+ pow +"</sup>";         }else {             return parsefloat(num).toprecision(significantfigures);         }     } }

when im sending 0.2 or 0.11 im getting 0.2000 , 0.1100. issue here toprecision acts tofixed. ideas?

edit

what want? simple that, if numbers needs changed e.g 0.012312312041 should 0.0123 , numbers 0.12 or 28 should stay same.


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