How can I get file extensions with JavaScript?

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终归单人心
终归单人心 2020-11-22 09:37

See code:

var file1 = \"50.xsl\";
var file2 = \"30.doc\";
getFileExtension(file1); //returns xsl
getFileExtension(file2); //returns doc

function getFileExt         


        
30条回答
  •  没有蜡笔的小新
    2020-11-22 10:23

    Try this:

    function getFileExtension(filename) {
      var fileinput = document.getElementById(filename);
      if (!fileinput)
        return "";
      var filename = fileinput.value;
      if (filename.length == 0)
        return "";
      var dot = filename.lastIndexOf(".");
      if (dot == -1)
        return "";
      var extension = filename.substr(dot, filename.length);
      return extension;
    }
    

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