i am getting this error  in javascript  here is my code

logToFile.js

var logfile = "/usr/local/freeswitch/scripts/test.log";

var fd = new File(logfile);

i have defined but error is coming 

 logToFile.js:3 Exception: ReferenceError: File is not defined (near: "var fd = new File(logfile);")

Dont know why  ?

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