What is the standard convention or rule for writing javascript for a web page and why?

What is the standard javascript convention for a web page (code will not be used anywhere else). I ask about this because I am always confused about what technique should be followed? And if we say that I need to write a generic lib code / utility, which one is the best technique? Let me know if there are other ways? I share some methods that I know of. What is the difference between each and when should you use the technique below?

example 1:

((function (mine) {
   mine.foo = 'this is a property';

   mine.bar = function(){
      return 'this is a function with ' + mine.foo;
   };
})(window.mine = window.mine || {});
alert(mine.bar());

Example 2:

 var mine = function(){};
 mine.foo = 'this is a property';    
 mine.bar = function(){
    return 'this is a function with ' + mine.foo;
 }
 alert(mine.bar());

Example 3:

var mine = {
    'foo' : ' this is a property ',
    'bar' : function(){
         return ' this is a function with '+ mine.foo;
     } 
};
alert(mine.bar());

example 4:

function Mine() {
    this.foo = 'this is a property';
}
Mine.prototype.bar = function(var1){
    return ' this is a function with '+ this.foo;
};
var mine = new Mine();
alert(mine.bar());

Example 5:

var foo = 'this is a property';
function bar(){
    return ' this is a function with '+ foo;
}
alert(bar());

thank

EDIT : JavaScript-Module-Pattern is IMO path