如何在jquery中访问“THIS”的不同级别？

Question

我知道下面的代码是不敛元素的最有效的方式，但是对于一个例子的缘故...

$('.myFirstClass').each(function(i){ 
    // Here is the first 'THIS' occurrence 
    $(this).find('.mySecondClass').each(function(j){ 
     // Here is the second 'THIS' occurrence 
     // How do i access the first occurrence from here? 
    }); 
}); 

Answer 1

无需存储变量。 jQuery的已经这样做了第二个参数...

$(".myFirstClass").each(function(i, j){ 
    // I am represented as this or j 
    $(j).find(".mySecondClass").each(function(a, b){ 
    // I am represented as this or b 
    // I can communicate with j 
    }); 
}); 

Answer 2

商店此之前内每一个变种。

$('.myFirstClass').each(function(i){ 
    //store this 
    var $that = $(this); 
    $(this).find('.mySecondClass').each(function(j){ 
     //$that.something 
     // How do i access the first occurrence from here? 
    }); 
}); 

Answer 3

这样的事情，

$('.myFirstClass').each(function(i){ 
    var firstClassThis = this; 
    $(this).find('.mySecondClass').each(function(j){ 
     // Here is the second 'THIS' occurrence 
     // How do i access the first occurrence from here? 
     //You can use firstClassThis here due to closure. 
    }); 
}); 

Answer 4

$('.myFirstClass').each(function(i){ 
    var me = this; 
    $(this).find('.mySecondClass').each(function(j){ 
     alert($(me).attr('id')); 
    }); 
}); 

这应该工作。