There is an error in the script. Please try this code
<script>
$(document).ready(function (){
$('#cmd').click(function () {
var specialElementHandlers =
function (element,renderer) {
return true;
}
var doc = new jsPDF();
doc.fromHTML($('#content').html(), 15, 15, {
'width': 170,
'elementHandlers': specialElementHandlers
});
doc.output('datauri');
});
});
</script>