js闭包

var title = 'blog';
(function(title){
  $.post(url, {}, function(data){
    alert(title);//output single's blog, 我们期望的是输出 blog
  })
}(title))
title = "single's blog";
(function(title){
  $.post(url, {}, function(data){
    alert(title);//output single's blog
  })
}(title))
for(var i=0;i<3;i++)
{
   ((function(i){
        $.get('/?'+i, {}, function(data){
            alert(i); // alert(1) alert(2) alert(3)
        })
    }(i))
}