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我在 jQueryMobile 上使用 gmap4rails，但是当我重定向到显示地图的页面时，地图没有显示。当我刷新地图页面时，地图正常显示，但当我重定向到显示该页面的页面时却没有。有谁知道为什么？谢谢！下面是代码

/app/views/items/map.html.erb

<div data-role="header">
  <h1>Market</h1>
  <%= link_to 'Sell/Buy', new_item_path, "data-icon" => "plus", "class" => "ui-btn-right" %>
  <%= link_to 'Back', root_path, "class" => "ui-btn-left" %>

</div>
<div class="center-wrapper">
<div data-role="controlgroup" data-type="horizontal">
  <a href="/market" data-role="button">List</a>
  <a href="/map" data-role="button">Map</a>
</div>
</div>
<div data-role="content">

    <%= gmaps4rails(@json) %>

</div>

/app/views/layouts/application.html.erb

<!DOCTYPE html>
<html>
<head>
  <title>Project</title>
  <%= stylesheet_link_tag    "application", :media => "all" %>
  <link rel="stylesheet" 
  href="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.css" />

  <%= javascript_include_tag "application" %>

  <script src="http://code.jquery.com/mobile/1.3.1/jquery.mobile-1.3.1.min.js"></script>
  <meta name="viewport" content="initial-scale=1, maximum-scale=1">

  <%= csrf_meta_tag %>


</head>
<body>
<div data-role="page">
  <%= yield %>
  <%= yield :scripts %>
</div>
</body>
</html>

/config/routes.rb

ProjectZ::Application.routes.draw do

  ...
  match '/map', to: 'items#map'
end
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