关闭选项卡之前确认框 [英] Confirm box before closing a tab

问题描述

当用户尝试关闭窗口时，我想要一个确认框.

I want to have a confirm box when user tries to close the window.

window.onbeforeunload = function (evt) {
    var message = 'Are you sure you want to leave, cause there are some unsaved changes?';
    if (typeof evt == 'undefined') {
        evt = window.event;
    }
    if (evt) {
        evt.returnValue = message;
    }

    return message;
}

我要检查变量值

var sncro = 1;

如果其值不等于1，则此确认框应存在，否则无需确认.我不知道这一点.它是如此愚蠢，但我要求任何人都可以看一下代码.

If its value is not equal to one then this confirmation box should be there, else no need to have a confirmation. I'm not able to figure this. Its so silly but I request anybody can have a look on the code.

推荐答案

我假设在页面加载时，您正在设置var sncro = 1；当某些数据更改时，您可以调整此值.这是快速检查:

I assume that on page load, you are setting up var sncro=1; and when some data changes, you adjust this value. Here is the quick check:

window.onbeforeunload = function (evt) {
  if (sncro != 1) {
   var message = 'Are you sure you want to leave, cause there are some unsaved changes?';
   if (typeof evt == 'undefined') {
      evt = window.event;
   }
   if (evt ) {
      evt.returnValue = message;
   }
   return message;
  }
}

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