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我正在rails上使用ruby開發一個網頁。 我發現我的一個網頁加載時間很長。 我使用Pingdom的測試吧，這裏是結果： 
Web頁面加載時間爲Rails網頁
然後我指的是這和YSlow的報告
一些F級選項：
1.Grade F於減少HTTP請求 此頁面有78個外部Javascript腳本。嘗試將它們合併爲一個。 減少頁面上組件的數量可減少呈現頁面所需的HTTP請求數量，從而加快頁面加載速度。減少組件數量的一些方法包括：合併文件，將多個腳本合併成一個腳本，將多個CSS文件合併到一個樣式表中，並使用CSS Sprites和圖像映射。
2.添加過期F級標題 有82個靜態組件沒有遠期過期日期。
3.Grade F於使用無cookie的域 但是也有一些不是免費的餅乾
4.Grade F於把在JavaScript的底部 81個組件有在的頭部發現有78個JavaScript腳本的文件
我覺得主要是混亂的java腳本或CSS造成漫長的等待時間。 建議在頁面末尾放置java腳本。
的問題是：對於Ruby on Rails的，我的JavaScript文件：應用程序\資產\ JavaScript的\ custom.js ，而我的看法頁面中：應用程序/視圖/ sth.html.erb 我不知道如何把它放在最後。
附上我在app /視圖代碼/ sth.html.erb
<h3>Project Information</h3>
<div class="project-report">
<table class="content-table">
<tr>
<td><strong>PJO Number</strong></td>
<td><%= @project.job_number %></td>
</tr>
<tr>
<td><strong>Client</strong></td>
<td><%= @project.client_name %></td>
</tr>
<tr>
<td><strong>Location</strong></td>
<td><%= @project.jobsite_location %></td>
</tr>
<br>
<td>
<tr>
<td><strong>Contacts</strong></td>
</tr>
<br>
<table class="yellow-header-table contact-table">
<tr>
<th>Name</th>
<th>Designation</th>
<th>Email</th>
<th>SMS</th>
<th>Fax</th>
</tr>
<% @project.contacts.each do |contact| %>
<tr>
<td><%= contact.contact_person_name %></td>
<td><%= contact.designation %></td>
<td><%= contact.email %></td>
<td><%= contact.phone_number %></td>
<td><%= contact.fax_number %></td>
</tr>
<% end %>
</table>
</td>
</table>
<table class="yellow-header-table">
<tr>
<th>Instrument Type</th>
<th>Total</th>
<th>Installed</th>
<th>Active</th>
<th>Remarks</th>
</tr>
<tr>
<td>first Meter</td>
<td><%= @project.quantity_active %></td>
<td><%= @project.quantity_active %></td>
<td><%= @project.quantity_active %></td>
<td><%= @project.sound_remarks %></td>
</tr>
</table>
<div style='margin-left:50px;float:left;'>
<button id="buttonN" class="btn btn-info" style="width:190px;">View Data1</button>
<button id="buttonV" class="btn btn-info" style="margin-left:50px;width:190px;">View Data2</button>
<button id="buttonR" class="btn btn-info" style="margin-left:50px;width:190px;">Generate Report</button>
</div>
<div id="report-reviewn" class="hidden" style='margin-top:55px;'>
<% if (@devices.count > 0) %>
<h4 style="width:100%">1st Devices</h4>
<table id="tableselect" class="yellow-header-table">
<tr>
<th scope="Row">Select</th>
<th>Device ID</th>
<th>Brand</th>
<th>Address</th>
</tr>
<%= form_tag viewdata_devices_path,class:"form-horizontal viewlist-form" do %>
<% @project.first_devices.each do |first_device| %>
<tr>
<th scope='col'>
<%= radio_button_tag(:deviceID, first_device.id) %></th>
<td><%= first_device.device_id %></td>
<td><%= first_device.serial_number %></td>
<td><%= first_device.brand %></td>
<td><%= first_device.last_calibration_date %></td>
<td><%= first_device.remarks %></td>
<td><%= @project.project_type %></td>
<td>
<select style='border:none;'>
<option><%= first_device.device_location %></option>
<option><%= first_device.device_latlng %></option>
</select>
</td>
</tr>
</tr>
<% end %>
</table>
<table class="table-row">
<tr>
<th> <%= text_field_tag 'startday', nil, placeholder: 'Start Date',style:'width:100px;', class: "date-picker" %></th>
<th> <%= text_field_tag 'endday', nil, placeholder: 'End Date' ,style:'width:100px;',class: "date-picker" %><th>
<%= hidden_field_tag "project_id", @project.id %>
<th> <%= submit_tag "View Data",class: "btn" %></th>
<% end %>
</tr>
</table>
<% else %>
<p style="width:100%;text-align:left;margin-left:50px;">There is no first device for this project </p>
<% end %>
</div>
<div id="report-reviewv" class="hidden" style='margin-top:55px;' >
<% if (@vdevices.count > 0) %>
<table class="yellow-header-table">
<h4 style="width:100%">second Devices</h4>
<tr>
<th scope="Row">Select</th>
<th>Device ID</th>
<th>Address</th>
</tr>
<%= form_tag viewdata_second_devices_path,class:"form-horizontal viewlist-form" do %>
<% @project.second_devices.each do |second_device| %>
<tr>
<th scope='col'>
<%= radio_button_tag(:deviceID, second_device.id) %></th>
<td><%= second_device.device_id %></td>
<td><%= second_device.serial_number %></td>
<td><%= second_device.brand %></td>
<td><%= second_device.current_trigger_value %></td>
<td><%= second_device.last_calibration_date %></td>
<td><%= second_device.remarks %></td>
<td><%= @project.project_type %></td>
<td>
<select style='border:none;'>
<option><%= second_device.device_location %></option>
<option><%= second_device.device_latlng %></option>
</select>
</td>
</tr>
<% end %>
</table>
<table class="table-row">
<tr>
<th> <%= text_field_tag 'startday', nil, placeholder: 'Start Date',style:'width:100px;', class: "date-picker" %></th>
<th> <%= text_field_tag 'endday', nil, placeholder: 'End Date' ,style:'width:100px;',class: "date-picker" %><th>
<%= hidden_field_tag "project_id", @project.id %>
<th> <%= submit_tag "View Data",class: "btn" %></th>
<% end %>
</tr>
</table>
<% else %>
<p style="width:100%;text-align:left;margin-left:50px;">There is no second device for this project </p>
<% end %>
</div>
<div id="report-reviewr" class="hidden" style='margin-top:100px;'>
<div class="report-forms report-left-align">
<span><strong>Report Type</strong></span>
<%= select_tag "report-type", options_for_select([["first", "first-report"], ["second", "second-report"]]), :prompt => "Choose Report" %>
<div id="first-report" class="report-form hidden">
<%= form_tag report_first_devices_path, class: "form-horizontal device-form", target: "_blank" do %>
<div class="control-group">
<%= label_tag "Choose Devices", nil, class: "control-label" %>
<div class="controls">
<% selected_first_device = @project.first_devices.blank? ? nil : @project.first_devices.first.id %>
<%= select_tag "devices", options_from_collection_for_select(@project.first_devices, "id", "serial_number", selected_first_device), :multiple => false %>
</div>
</div>
<div class="control-group">
<%= label_tag "Choose Time", nil, class: "control-label" %>
<div class="controls">
<%= text_field_tag "time_range", nil, class: "input-large date-picker" %>
</div>
</div>
<%= hidden_field_tag "project_id", @project.id %>
<%= hidden_field_tag "device_type", "first" %>
<div class="control-group">
<div class="controls">
<%= submit_tag "Generate Report", class: "btn" %>
</div>
</div>
<% end %>
</div>
<div id="second-report" class="report-form hidden">
<%= form_tag report_second_devices_path, class: "form-horizontal device-form", target: "_blank" do %>
<div class="control-group">
<%= label_tag "Choose Devices", nil, class: "control-label" %>
<div class="controls">
<% selected_second_device = @project.second_devices.blank? ? nil : @project.second_devices.first.id %>
<%= select_tag "devices", options_from_collection_for_select(@project.second_devices, "id", "serial_number", selected_second_device), :multiple => false %>
</div>
</div>
<div class="control-group">
<%= label_tag "Choose Time", nil, class: "control-label" %>
<div class="controls">
<%= text_field_tag "time_range", nil, class: "input-large date-picker" %>
</div>
</div>
<%= hidden_field_tag "project_id", @project.id %>
<%= hidden_field_tag "device_type", "second" %>
<div class="control-group">
<div class="controls">
<%= submit_tag "Generate Report", class: "btn" %>
</div>
</div>
<% end %>
</div>
</div>
</div>
</div>
任何人都可以給一些建議？
我已經移動了這條線，但等待時間仍然在10秒左右。我是否需要重新啓動以獲得此功能？或者可能是其他原因造成這個問題：做少量http請求/添加過期標題/縮小Javascript和CSS – Orz
是啊看到JS的名單嚇了我一跳，我不知道爲什麼我沒有把它放在我的答案。我會添加一些信息。 – SidOfc