在JavaScript中创建deepEqual函数

我知道围绕这一点有很多问题，但我正在尝试创建自己的版本。我也知道还有一个lodash版本

这是我当前的代码：

var deepEqual = function(obj1, obj2) {
  console.log(obj1, obj2);
  // if they reference the same object in memory, then they are the same
  if (obj1 === obj2) {
    return true; 
  }

  if (Array.isArray(obj1) && Array.isArray(obj2) &&
      obj1.length === obj2.length) {
    for (var i = 0; i < obj1.length; i++) {
      if (!deepEqual(obj1[i], obj2[i])) {
        return false;
      }
    }
  }

  // if they don't have the same length, then not equivalent
  if ( Object.keys(obj1).length !== Object.keys(obj2).length) {
    return false;
  }

  // if they don't have the same properties, then not equivalent
  for (var key in obj1) {
    if (!(key in obj2) || !deepEqual(obj1[key], obj2[key])) { // line 24
      return false;
    }
  }

  return true;
}

它返回

true

，但是当我在第二个参数中将

中的'y'更改为
'THIS'u'NOT'u'y'
：我得到

console.log(deepEqual(obj, {here: {is: "an"}, object: 2, here: "is", an: ['a','r',{r: {a:'THIS_IS_NOT_y'}}, ['!']]}))

我明白了：

TypeError: invalid 'in' operand obj2 (line 24 in function deepEqual) 

我不知道如何解决这个问题

除了修复上述错误外，我的代码中是否还缺少任何其他类型/情况？
而
for（y中的var键）{
..
}
将
“0”
作为一个可枚举键进行迭代，“z”

中的

“0”导致语法错误。您可以区分基元类型和对象，并直接比较基元。而
for（y中的var键）{
..
}
将
“0”作为一个可枚举键进行迭代，而“z”
中的
“0”会导致语法错误。您可以区分基本体类型和对象，并直接比较基本体。
    function deepEqual(obj1,obj2){

      if(obj1 === obj2) {   //Same object reference
            return true; }

      if( Object.keys(obj1).length !== Object.keys(obj2).length) {
            return false; }  // If length is not same objects are not


     for(var i in obj1){
       if((obj1[i] !== null && typeof obj1[i] === 'object') && 
          (obj2[i] !== null && typeof obj2[i] === 'object')){

               return deepEqual(obj1[i],obj2[i]);}

       else if(((typeof obj1[i]) != 'object') && 
               ((typeof obj1[i]) != 'object')){
                     if(obj1[i]===obj2[i]){
                        return true; // These are identical values!
                      }
                }

       else if(obj1[i]==null && obj2[i]==null)
                { return true; } 

       else return false; //If they are not equal 
      }
   }         
    var obj = {here: {is: "an"}, object: 2, here: "is", an: ['a','r',{r: {a:'y'}}, ['!']]}; 

    console.log(deepEqual(obj, {here: {is: "an"}, object: 2, here:    "is", an: ['a','r',{r: {a:'THIS_IS_NOT_y'}}, ['!']]}));

    function deepEqual(obj1,obj2){

      if(obj1 === obj2) {   //Same object reference
            return true; }

      if( Object.keys(obj1).length !== Object.keys(obj2).length) {
            return false; }  // If length is not same objects are not


     for(var i in obj1){
       if((obj1[i] !== null && typeof obj1[i] === 'object') && 
          (obj2[i] !== null && typeof obj2[i] === 'object')){

               return deepEqual(obj1[i],obj2[i]);}

       else if(((typeof obj1[i]) != 'object') && 
               ((typeof obj1[i]) != 'object')){
                     if(obj1[i]===obj2[i]){
                        return true; // These are identical values!
                      }
                }

       else if(obj1[i]==null && obj2[i]==null)
                { return true; } 

       else return false; //If they are not equal 
      }
   }         
    var obj = {here: {is: "an"}, object: 2, here: "is", an: ['a','r',{r: {a:'y'}}, ['!']]}; 

    console.log(deepEqual(obj, {here: {is: "an"}, object: 2, here:    "is", an: ['a','r',{r: {a:'THIS_IS_NOT_y'}}, ['!']]}));