How to Add Bold to Java code in PDF

event.target.richText=true;
var lines1="Line 1\rLine 2\r\r";
var lines2= "Line 3\rLine 4\rLine 5\rLine 6\rLine 7";

var spans = new Array();
spans[0] = new Object();
spans[0].text="Client Services\r";
spans[0].fontWeight=900;

spans[1] = new Object();
spans[1].text = lines1;

spans[2] = new Object();
spans[2].text="Reviewers\r"
spans[2].fontWeight=900;

spans[3] = new Object();
spans[3].text = lines2;

event.target.richValue=spans;