如何在jquery中访问不同级别的“THIS”？

Question

我意识到下面的代码并不是抓取元素的最有效方法，但是为了一个例子......

$('.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

像这样的东西，

$('.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 2

无需存储变量。 jQuery已在第二个参数中执行此操作...

$(".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 3

将它存储在每个内部的var之前。

$('.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 4

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

这应该工作。