Grazie per l'interesse ma ho risolto in questo modo

codice:
	var coloreA="green";
			var percentualeA=0;

			var percentualeA1=70;
			

			var coloreB="yellow";

			var percentualeB=71;
			var percentualeB1=99;
			
			var coloreC="red";
			var percentualeC=100;
			var percentualeC1=1000;

			

			var myArray=[
						 [coloreA,percentualeA,percentualeA1],
						 [coloreB,percentualeB,percentualeB1],
						 [coloreC,percentualeC,percentualeC1]
						 ];
			

			var num;

			var mTabellaB = $("table > tbody > tr > td.ms-cellstyle").parent().parent().parent();
			var $index = $('table > thead > tr > th.ms-vh2:contains(% Percentuale)').index()+1;


			for (i = 0; i < myArray.length; i++) { 

			var $Text =$(" > tbody > tr > td:nth-child("+$index+")" ,

			mTabellaB ).filter(function() {
			// Get the number and convert it to Number
			num = +($(this).text().split('%',1));
			return num >= myArray[i][1] && num <= myArray[i][2] ;
			}).parent().children().css("color", myArray[i][0]);
			}
var coloreA="green";
var percentualeA=0;
var percentualeA1=70;

var coloreB="yellow";
var percentualeB=71;
var percentualeB1=99;

var coloreC="red";
var percentualeC=100;
var percentualeC1=1000;

var myArray=[
[coloreA,percentualeA,percentualeA1],
[coloreB,percentualeB,percentualeB1],
[coloreC,percentualeC,percentualeC1]
];

var num;
var mTabellaB = $("table > tbody > tr > td.ms-cellstyle").parent().parent().parent();
var $index = $('table > thead > tr > th.ms-vh2:contains(% Percentuale)').index()+1;


for (i = 0; i < myArray.length; i++) {
var $Text =$(" > tbody > tr > td:nth-child("+$index+")" ,
mTabellaB ).filter(function() {
// Get the number and convert it to Number
num = +($(this).text().split('%',1));
return num >= myArray[i][1] && num <= myArray[i][2] ;
}).parent().children().css("color", myArray[i][0]);
}

var $index=$('table th.ms-vh2:contains(Obiettivo)').index()-1;
var $Text =$("tr").find("td.ms-cellstyle.ms-vb2:eq("+$index+")");
$Text.css("color", "RED",'important');
}