JavaScript 数组 filter 方法

JavaScript 数组 filter 方法

<html>
   <head>
      <title>JavaScript Array filter Method</title>
   </head>

   <body>

      <script type = "text/javascript">
         if (!Array.prototype.filter) {
            Array.prototype.filter = function(fun /*, thisp*/) {
               var len = this.length;

               if (typeof fun != "function")
               throw new TypeError();

               var res = new Array();
               var thisp = arguments[1];

               for (var i = 0; i < len; i++) {
                  if (i in this) {
                     var val = this[i];   // in case fun mutates this
                     if (fun.call(thisp, val, i, this))
                     res.push(val);
                  }
               }
               return res;
            };
         }

         function isBigEnough(element, index, array) {
            return (element >= 10);
         }

         var filtered  = [12, 5, 8, 130, 44].filter(isBigEnough);
         document.write("Filtered Value : " + filtered );
      </script>

   </body>
</html>