SOURCE

module.exports = function(arr1, arr2) {
    if(arr1.length===0||arr2.length===0||arr1.length!==arr2.length){
        return "参数错误";
    }
    var arr1Temp = arr1.sort();
    var arr2Temp = arr2.sort();
    var num = 0;
    for(var i =0,j=arr1.length-1;i<arr1.length;i++,j--){
            num += arr1[i]*arr2[j];
    }
    console.log(num);
    return num;
}