Javascript 仅当新选项卡尚未打开时才打开它

仅当新选项卡尚未打开时，才可以打开它

index.php

$('.title').on('click', function(){
    if tab `images.php` is already open -> go to that tab
    else {window.open('images.php', '_blank')  // open a new tab
});

因此，如果新选项卡已经存在，我不想打开它

---

在这两种情况下，当前选项卡（

index.php

）保持打开状态，但不处于活动状态。

只需为窗口指定一个名称，并确保该名称不以下划线开头，否则其行为将类似于html的

\u target

属性：

$('.title').on('click', function(){
  window.open('images.php', 'myWindow')
  // it will open the same window on following clicks
});

如果不想重新加载页面，请执行以下操作：

var myWindow = null;
$('.title').on('click', function(){
  if(myWindow == null || myWindow.closed)
    myWindow = window.open('images.php', 'myWindow')
  else
    myWindow.focus()
});

您可以在从“最佳实践”部分复制的。

中阅读有关window.open的更多信息

---

相关问题可能会有帮助（如果不是重复的话）：这是否也会导致打开的页面重新加载？我如何设置窗口名称，请？@TimSch Yes。第二个参数是窗口名，如示例所示。@bhojendraurauniyar，抱歉，我不明白，我首先需要检查窗口是否打开，所以我需要在

窗口之前设置它的名称。open…

@bhojendrauniyar，未选中，但似乎可以工作。谢谢

var windowObjectReference = null; // global variable

function openFFPromotionPopup() {
  if(windowObjectReference == null || windowObjectReference.closed)
  /* if the pointer to the window object in memory does not exist
     or if such pointer exists but the window was closed */

  {
    windowObjectReference = window.open("http://www.spreadfirefox.com/",
   "PromoteFirefoxWindowName", "resizable,scrollbars,status");
    /* then create it. The new window will be created and
       will be brought on top of any other window. */
  }
  else
  {
    windowObjectReference.focus();
    /* else the window reference must exist and the window
       is not closed; therefore, we can bring it back on top of any other
       window with the focus() method. There would be no need to re-create
       the window or to reload the referenced resource. */
  };
}