某面试公司出的面试题---用JS比较两个版本号高低

一天中午某个公司给我反馈的面试题，说，比较两个文件的版本号，然后我给发过去了，说我的代码不符合他的要求，o(╯□╰)o了
var compareVersion = compareVersion||function(version1, version2) {
var v1Arr=version1.split(".");
var v2Arr=version2.split(".");
var len = Math.max(v1Arr.length, v2Arr.length);
for(var i = 0; i < len; i++){

var v1 = formatV(v1Arr[i]);
var v2 = formatV(v2Arr[i]);
if(v1 > v2){
return 'version1版本高';
}else if(v1 < v2){
return 'version2版本高';
}
}
return 'version1和version2版本相同';
function formatV(num){
if(!num){
return 0;
}
var res = parseFloat(num);
if(isNaN(res)){
throw num+"错误！该值不是数字！"
}
return res;
}

};

console.log(compareVersion('1','0'));
console.log(compareVersion('1.3','2.1'));
console.log(compareVersion('1.5.0','1.1.3'));
console.log(compareVersion('1.1','1.10'));
console.log(compareVersion('10.1','1.1'));
console.log(compareVersion('01','1'));
console.log(compareVersion('1.0.0.0.0.0.0','1.0.0'));

//异常情况
console.log(compareVersion('dddd','1'));