javascript实现类似java中getClass()得到对象类名的方法

var getObjectClass = function (obj) { if (obj && obj.constructor && obj.constructor.toString()) {   /*    * for browsers which have name property in the constructor    * of the object,such as chrome     */   if(obj.constructor.name) {    return obj.constructor.name;   }   var str = obj.constructor.toString();   /*    * executed if the return of object.constructor.toString() is     * "[object objectClass]"    */   if(str.charAt(0) == '[')   {     var arr = str.match(//[/w+/s*(/w+)/]/);   } else {     /*      * executed if the return of object.constructor.toString() is       * "function objectClass () {}"      * for IE Firefox      */     var arr = str.match(/function/s*(/w+)/);   }   if (arr && arr.length == 2) {      return arr[1];   }  }  return undefined; };