JavaScript 数组 some 方法

JavaScript 数组 some 方法

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

   <body>

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

               var thisp = arguments[1];
               for (var i = 0; i < len; i++) {
                  if (i in this && fun.call(thisp, this[i], i, this))
                  return true;
               }
               return false;
            };
         }

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

         var retval = [2, 5, 8, 1, 4].some(isBigEnough);
         document.write("Returned value is : " + retval );

         var retval = [12, 5, 8, 1, 4].some(isBigEnough);
         document.write("<br />Returned value is : " + retval );
      </script>

   </body>
</html>