javascript - 如何检查jQuery或纯JavaScript中是否存在文件？(How do I check if file exists in jQuery or pure JavaScript?)

Question

如何检查服务器上的文件是否存在jQuery或纯JavaScript中？

  ask by usertest translate from so

Answer 1

With jQuery:(使用jQuery：)

$.ajax({ url:'http://www.example.com/somefile.ext', type:'HEAD', error: function() { //file not exists }, success: function() { //file exists } }); EDIT:(编辑：) Here is the code for checking 404 status, without using jQuery(这是不使用jQuery即可检查404状态的代码) function UrlExists(url) { var http = new XMLHttpRequest(); http.open('HEAD', url, false); http.send(); return http.status!=404; } Small changes and it could check for status HTTP status code 200 (success), instead.(进行较小的更改，它可以检查状态HTTP状态代码200（成功）。)