Edit in JSFiddle

$(document).ready(function(){
    // using substring function
    // str.substring(from, to)
    var str = "Hello we are learning jQuery";
    var result1 = str.substring(1,4);
    var result2 = str.substring(9);
    $('#output1').html(result1);
    $('#output2').html(result2);
    
    // using substr function
    // str.substr(start, length)
    var str = "Hello we are learning jQuery";
    var result3 = str.substr(1,4);
    var result4 = str.substr(9);
    $('#output3').html(result3);
    $('#output4').html(result4);
});

<span id='output1'></span>
<br/>
<span id='output2'></span>
<br/><br/>
<span id='output3'></span>
<br/>
<span id='output4'></span>