Remove Element From Array A If It Exists In B

I wonder if there any better method to check if the element in array B exists in array A, then remove it from array A.
Code:
var arrA = ['a','b','c','d','e']
var arrB = ['c'];
I copied and modified this code from somewhere I got it online, but not sure if I understand it as it has two for-loops in it...

Code:
for(var i=0;i<arrA.length;i++) {
for(var j=0;j<arrB.length;j++) {
if(arrB[j] == arrA[i]) {
var index = arrA.indexOf(arrA[i]);
}}}
code to remove element from array A,

Code:
if(index >= 0){
arrA.splice(index,1);
alert(arrA.join(" "));
}