Prototype - compact() 方法

此方法返回数组的新版本，不含任何 null/undefined 值。

语法

array.compact();

返回值

返回不含任何 null 或 undefined 值的新数组。

示例

<html>
   <head>
      <title>Prototype examples</title>
      <script type = "text/javascript" src = "/javascript/prototype.js"></script>
      
      <script>
         function showResult() {
            var oldArr =['Sam','Justin','Andrew','Dan', null, undefined];
            alert("Guys in old Arr" );
            
            oldArr.each(function(item) {
               alert(item );
            });
            var newArr = oldArr.compact();
            alert("Guys in new Arr" );
            
            newArr.each(function(item) {
               alert(item );
            });
         }
      </script>
   </head>

   <body>
      <p>Click the button to see the result.</p>
      <br />
      <br />
      <input type = "button" value = "Result" onclick = "showResult();"/>
   </body>
</html>

输出

prototype_array_processing.htm

打印页面

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