Question

标题几乎说了。我有两个JSON对象，我想知道它们是否相等（具有相同的属性值）。

我可以对它们进行字符串化，但我不确定两个相等的对象是否总能产生相同的输出：

E.g：

{
    "firstName": "John",
    "lastName": "Smith",
    "age": 25,
    "favoriteColors": ["blue", "green", "red"]
}

是一个不同的字符串：

{
    "age": 25,
    "lastName": "Smith",
    "firstName": "John",
    "favoriteColors": ["blue", "green", "red"]
}

但作为对象，它们具有相同的属性。

Answer 1

Flex SDK中有一种方法。它在班级ObjectUtil中。以下是来源的描述：

/**
     * Compares the Objects and returns an integer value 
     * indicating if the first item is less than greater than or equal to
     * the second item.
     * This method will recursively compare properties on nested objects and
     * will return as soon as a non-zero result is found.
     * By default this method will recurse to the deepest level of any property.
     * To change the depth for comparison specify a non-negative value for
     * the depth parameter.
     * @param   a   Object.
     * @param   b   Object.
     * @param   depth   Indicates how many levels should be 
     *   recursed when performing the comparison.
     *   Set this value to 0 for a shallow comparison of only the primitive 
     *   representation of each property.
     *   For example:
     *   var a:Object = {name:"Bob", info:[1,2,3]};
     *   var b:Object = {name:"Alice", info:[5,6,7]};
     *   var c:int = ObjectUtil.compare(a, b, 0);In the above example the complex properties of a and 
     *   b will be flattened by a call to toString()
     *   when doing the comparison.
     *   In this case the info property will be turned into a string
     *   when performing the comparison.
     * @return  Return 0 if a and b are null, NaN, or equal. 
     *   Return 1 if a is null or greater than b. 
     *   Return -1 if b is null or greater than a.
     * @langversion 3.0
     * @playerversion   Flash 9
     * @playerversion   AIR 1.1
     * @productversion  Flex 3
     */
    public static function compare (a:Object, b:Object, depth:int=-1) : int;

如果您不想要整个SDK，可能只需获取此功能/类并使用该源。

您可以看到来源here。大多数工作都是在函数internalCompare中完成的。

Answer 2

也许您可以将两个对象转换为字符串然后比较它们

function compareJSON(a:Object, b:Object):Boolean
{
  return JSON.stringify(a)===JSON.stringify(b);
}

Answer 3

编辑：Barış的答案是最好的选择，因为它经过了尝试和测试。以防这对某人派上用场：

鉴于JSON值仅限于一小组简单类型，因此应该可以非常轻松地通过属性进行递归。这些行中的某些内容适用于您的示例：

private function areEqual(a:Object, b:Object):Boolean {
    if (a === null || a is Number || a is Boolean || a is String) {
        // Compare primitive values.
        return a === b;
    } else {
        var p:*;
        for (p in a) {
            // Check if a and b have different values for p.
            if (!areEqual(a[p], b[p])) {
                return false;
            }
        }
        for (p in b) {
            // Check if b has a value which a does not.
            if (!a[p]) {
                return false;
            }
        }
        return true;
    }
    return false;
}

在AS3中，如何检查两个JSON对象是否相等？

3 个答案: