javascript - JS 中 "this"的 jQuery 等价物是什么？

Question

根据标题，$('#id') 与此相同吗，例如在每个循环中？

编辑:假设我有以下代码

$('#id').each(function() {  
    var id = $(this).attr('id');  
});

我可以使用什么相当于“this”的 jQuery 来代替“this”？

我希望这更清楚。

Answer 1

在你的代码中

var $element = $('#id').each(function() {
   // here this refers to the native JS element. The same object that you get when you call document.getElementById('id');
   var id = this.getAttribute('id'); // this.id will also work

   // $(this) refers to the jQuery collection object, which is same as $('#id').
   var id = $(this).attr('id');

   // A jQuery collection is also an array of native objects, so you can also access the element using array access
   var id = $(this)[0].getAttribute('id');

   // This may not make sense in the above example, but when you have the collection as a variable, this might be the best option
   var id = $element[0].id;
});