Algorithm-implements each traversal of multidimensional arrays (JavaScript)

#  implements each traversal of a multidimensional array   <script type= "Text/javascript" >   //    var arr=[1,2,3,4,[1,2,3,4]]//   arr.foreach (function (Item,index,array)) {}    var arr=[12,3,2,3,4,[3,2,4,1],[3,3,1,32,12,4,4,52]]       Array.prototype.each=function (FN) {    try{//     1, using THIS.I, Records the position of the current traversed element, separate scope      this.i | |   (this.i=0)//     2, rigorous judgment when to use each ()://      when the array length is greater than 0, And the passed argument must be a function           if (this.length>0 &&  fn.constructor==function) {//       iterates through the array, using while,for at the bottom, and less for in                   while ( This.i<this.length) {       var e=this[this.i]//        determines whether an element is an array        if (e & & e.constructor==array) {//         Perform a recursive operation if the element is an array          e.each (FN)        }else{//          if the element is non-array, the element is passed to the FN function,//         Pass parameters (current element) to FN, and execute function fn        fn.call (null,e)         }       this.i++      }// After the        function finishes, free up memory, recycle variables       this.i=null      }    }catch (ex) {     //todo handle  the exception    }        return  This   }&nbsP;     console.log (Arr.each ())      </script> 

Algorithm-implements each traversal of a multidimensional array (JavaScript)