两个数组取相同和不同元素

var arr = ['apple','pear','banana','orange','strawberry','orange','8'],
    arr2 = ['apple','pear','banana','cabage',8];

//取相同
function getArrEqual(arr1,arr2){
    let newArr = [];
    for(let i=0,len=arr2.length;i<len;i++){
        for (let j=0,len1 = arr1.length;j<len1;j++){
            if (arr2[i] === arr1[j]){
                newArr.push(arr2[j]);
            }
        }

    }
    return newArr;
}
console.log(getArrEqual(arr,arr2));

//取不同
var r = arr.concat(arr2).filter(function(item,index,self){
    return self.indexOf(item) == self.lastIndexOf(item);
});
console.log(r);
console.log(r.toString());