title: javascript: how to cope with "@" and ":" in Json
body: <p>There is a json data:</p>
  
  <pre><code>var json = {  
      "entry" : [{ 
          "category" : {
              "@scheme" : "http:\/\/www.douban.com\/2007#kind", 
              "@term" : "http:\/\/www.douban.com\/2007#movie"
          }, 
          "title" : {
              "$t" : "Real Steel"
          },
          "db:attribute" : [{
              "$t" : "USA", 
              "@name" : "country"
          }]
      }]
  }
  </code></pre>
  
  <p><code>alert(json.entry[0].title.$t)</code>  can print "Real Steel". However,
  how to get the <code>http:\/\/www.douban.com\/2007#kind</code> and <code>USA</code>  in Javascript　？　</p>
  
  <p>　It contains <code>@</code> and <code>:</code>, I don't know how to cope with it.</p>