var s1='a,b,c,d';
        var s2='a,c,d,b';
    var arr1 = s1.split(',');
    var arr2 = s2.split(',');
    var right = 0;
    var wrong = 0;
    var total = arr2.length;
    for(var i=0; i<total; i++){
        if(arr1[i] == arr2[i]){
            right++;
        } else {
            wrong++;
        }
    }

    alert('正确率：' + right/total);