JavaScript 空数组

<html>
   <head>
      <title>JavaScript Arrays</title>
   </head>
   <body>
      <script>
         var arr = ["orange", "mango", "banana", "sugar", "tea"];
         document.write("<br />Original array: " + arr );
         arr = [];
         document.write("<br />Current array: " + arr );
      </script>
   </body>
</html>