JavaScript-Encapsulated functions

1 /*gets a specified length random number*/2Csdn.random =function(len) {3     if(!len) len = 5;4     varR =math.random (). toString ();5     returnR.substr (R.length-len);6 };7 8 9 /*determine if the URL contains a string s*/TenCsdn.urlhas =function(s) { One     returnWindow.location.href.toLowerCase (). IndexOf (S.tolowercase ()) > 0; A }; -  -  the  - /*obtaining a user name from a cookie*/ -Csdn.getun =function () { -     varm = Document.cookie.match (NewRegExp ("(^|) Username= ([^;] *)(;|$)")); +     if(m)returnM[2]; -     Else return‘‘; + }; A  at  -  functionformatbytes (bytes) { -             vars = [' Byte ', ' KB ', ' MB ', ' GB ', ' TB ', ' PB ']; -             varE = Math.floor (Math.log (bytes)/Math.log (1024)); -             return(Bytes/math.pow (1024x768, Math.floor (e))). ToFixed (2) +S[e]; -         } in         functionReturnfalse () {return false; } -     } to      +  - //The typeof operator returns a string that is used to represent the data type of the expression.  the functionIsoptionalvalue (value) { *   return typeof(value) = = = ' Undefined ' | | Value = =NULL; $}

JavaScript-Encapsulated functions