javascript 判断对象的值是否相等

 经常要判断两个对象的值是否相等 ，写了个方法用来比较，和对象深层copy的思路有点像，都是将对象进行类型判断 然后操作 。记录下。

function compareobj(A,B){
                if(A instanceof Array){
                    if(!(B instanceof Array)){
                        return false;
                    }
                    var aLen = A.length,
                        bLen = B.length;
                    if(aLen != bLen){
                        return false;
                    }
                    var isEqual = true,num = 0;
                    for(var i = 0;i < aLen;i++){
                        if(A[i]!=B[i] && typeof A[i]=='object' && typeof B[i]=='object'){
                          isEqual = arguments.callee.apply(null,[A[i],B[i]]);
                          //isEqual = compareobj(A[i],B[i]);
                        }else{
                          isEqual = A[i]===B[i];
                        }
                        if(isEqual){
                            num++;
                        }
                    }
                    if(num != aLen){
                        return false;
                    }else{
                        return true;
                    }
                }else if(A instanceof Date){
                    if(!(B instanceof Date)){
                        return false;
                    }else{
                        return A.getTime() == B.getTime();
                    }
                }else if(A instanceof Object){
                    if((B instanceof Array) || (B instanceof Date) || !(B instanceof Object)){
                        return false;
                    }else{
                       var aLen=bLen=0;
                       for(var i in A){
                            aLen++;
                       }
                       for(var i in B){
                            bLen++;
                       }
                       if(aLen != bLen){
                            return false;
                       }
                       var isEqual = true,num = 0;
                       for(var i in A){
                         if(typeof A[i] == 'object' && typeof B[i] == 'object' && A[i]!=B[i]){
                            isEqual = arguments.callee.apply(null,[A[i],B[i]]);
                           // isEqual = compareobj(A[i],B[i]);
                         }else{
                            isEqual = A[i]===B[i];
                         }
                         if(isEqual){
                            num++;
                         }
                       }
                       if(num != aLen){
                            return false;
                       }else{
                            return true;
                       }
                    }
                }else{
                    if(B instanceof Object){
                        return false;
                    }else{
                        return A===B;
                    }
                }
            }