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using prototype to construct a function

Last Modified: 2014-05-01
Can someone till me what the problem is here?
function FileName(n, d, s) {
      this.name = n;
      this.date = d;
      this.service = s;
this.prototype.logInfo = function(){
var m0140415 = new FileName("m0140415", 20140415, "morning");

// as a side not, I've tried FileName.prototype.loginfo = function()
When I purse in Firefox, it indicate undefined function, and Aptana says I need a  semi; therefore, I added the semi to end of declared function.
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