The digital val rounding, and retain the decimal scale
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/**
* The val rounded , And retain scale decimal
*/
function mathRound(val,scale){
var base = 10;
for(var i=1;i<scale;i++){
base = base*10;
}
var newVal = Math.round(val*base)/base;
var rsplit = newVal.toString().split(".");
var zeroNum = scale;
if(rsplit[1]){
zeroNum = scale-rsplit[1].length;
}
if(zeroNum==scale){
newVal = newVal+".";
}
for(var i=0;i<zeroNum;i++){
newVal = newVal+"0";
}
return newVal;
}
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