jQuery(function ( $ ) {
  $( "a.switchDigit:contains('50')" ).css( "color", "green" );
  $( "a.switchDigit:contains('100')" ).css( "color", "red" );
});

<script>
(function(a){
var a=a.links,i=a.length;
while(i--){
if(a[i].className=="switchDigit"){
   switch(a[i].innerText){
    case "50":a[i].style.color="green";break;
    case "100":a[i].style.color="red";break;
   }
}
}
})(document);
</script>

<script>
(function(a){
var a=a.links,i=a.length;
while(i--){
with(a[i])
if(className.indexOf("switchDigit")==0){
    switch(innerText||textContent){
     case "50":style.color="#00ff00";break;
     case "100":style.color="ff0000";
    }
}
}
})(document);
</script>