使用javascript测试文件是否存在 [英] Test if a file exists with javascript

问题描述

这个问题已经被问到这里和此处。但是我尝试了三个没有好运的答案。我正在使用一个名为Niagara的系统，它充当了Web服务器，这可能是这些技术不起作用的原因。尽管如此，我觉得必须有办法检查文件是否存在，而不是存在404或200或0.

This question has already been asked here and here. But I have tried three of the answers with no good luck. I am using a system called Niagara which is acting as a web server, which may be the reason these techniques did not work. Nonetheless, I feel there must be a way to check for the existence of a file, not the existence of a 404 or 200 or 0.

推荐答案

您可以使用 $。ajax

$.ajax({
  url: 'example.com/abc.html', //or your url
  success: function(data){
    alert('exists');
  },
  error: function(data){
    alert('does not exist');
  },
})

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