JS判定データはJSONタイプですか?

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var  isJson = function(obj){     var  isjson = typeof(obj) == "object"  && Object.prototype.toString.call(obj).toLowerCase() == "[object object]"  && !obj.length;    return  isjson;}転載先:https://www.cnblogs.com/toward-the-sun/p/4724604.html