0で埋める - Javascript便利なコピペまとめ

function maru(val,ume,len){
	val=val+"";ume=ume+"";len=len+0;
	var t1="";
	var i=0;
	if(val.length>=len){return val;}
	for(i=1;i<len+1;i++){
		t1=t1+ume;
	}
	t1 = t1+val;
	t1 = t1.slice(-1*len);
	return t1;
}