JavaScript 程序崩溃页面

Question

我用 JavaScript 编写了一个简单的程序来查找3X3 矩阵的余因子矩阵。但是，程序反复使我的页面崩溃，我在程序中找不到任何逻辑错误。这是我的代码:

var matrixA = {
   a11:"",
   a12:"",
   a13:"",
   a21:"",
   a22:"",
   a23:"",
   a31:"",
   a32:"",
   a33:""
};

function determinant (given,order) {
if(order==3){
    var det = (given.a11*((given.a22*given.a33)-(given.a23*given.a32)))-
    (given.a21*((given.a12*given.a33)-(given.a13*given.a32)))+
    (given.a31*((given.a12*given.a23)-(given.a13*given.a22)));
}
else if(order==2){
    var det = (given.a11*given.a22)-(given.a21*given.a12);
}
return det;
}

function cofactors(given){
var multiplier;
var temp = {
    a11:"",
    a12:"",
    a21:"",
    a22:""
};
var found_cofactor_matrix = {};
for (var i = 1; i <4; i++) {
    for (var j = 1; i < 4; j++) {
        if(((i+j)%2)==0){
            multiplier = 1;
        }
        else if(((i+j)%2)==1){
            multiplier = -1;
        }
        //Check whether row or column number is the same to make a 2X2 matrix
        for(var a = 1; a < 4; a++){
            for (var b = 0; b < 4; b++) {
                if((a==i)||(b==j)){

                } //do nothing
                else{
                    if(temp.a11==""){
                        temp.a11 = given["a"+a+b];
                    }
                    else if(temp.a12 == ""){
                        temp.a12 = given["a"+a+b];
                    }
                    else if(temp.a21 == ""){
                        temp.a21 = given["a"+a+b];
                    }
                    else if(temp.a22 == ""){
                        temp.a22 = given["a"+a+b];
                    }
                }
            };
        };
    found_cofactor_matrix["a"+i+j] = multiplier*determinant(temp,2);
    };
};
return found_cofactor_matrix;
}

这里的参数“given”是从调用函数的地方传给它的对象，是要求余因子的原始矩阵(matrixA)。我基本上首先创建一个 2X2 矩阵，找到它的行列式并根据需要将其乘以 1 或 -1。然后我将这个值写入矩阵中的适当位置。

Answer 1

for (var j = 1; i < 4; j++) {应该是 for (var j = 1; j < 4; j++) { .