How do i...run this code by using javascript

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Javascript

function myfunc(){
var a=document.getElementById("one");
var b=document.getElementById("two");

for(var i=0;i<=a.length;i++){
if(b[i].value == a[i].value){
b[i].style.color = "yellow";
}
else if(b[i]!= a[i]){
b[i].style.color="red";
}
}

}



What I have tried:

i want to run this code,i want to make two input boxes and i apply fixed text to one input box,so in second box when user enters text that is equal to first input text
so the color of second input box by index wise will be yellow else red