javascript - '$（this）'和'this'有什么区别？(What's the difference between '$(this)' and 'this'?)

Question

I am currently working through this tutorial: Getting Started with jQuery(我目前正在研究本教程： jQuery入门)

For the two examples below:(对于以下两个示例：) $("#orderedlist").find("li").each(function (i) { $(this).append(" BAM! " + i); }); $("#reset").click(function () { $("form").each(function () { this.reset(); }); }); Notice in the first example, we use $(this) to append some text inside of each li element.(注意在第一个示例中，我们使用$(this)在每个li元素内附加一些文本。) In the second example we use this directly when resetting the form.(在第二个示例中，我们在重置表单时直接使用this 。) $(this) seems to be used a lot more often than this .($(this)似乎比this经常使用。) My guess is in the first example, $() is converting each li element into a jQuery object which understands the append() function whereas in the second example reset() can be called directly on the form.(我的猜测是在第一个示例中， $()将每个li元素转换为一个能够理解append()函数的jQuery对象，而在第二个示例中， reset()可以直接在表单上调用。) Basically we need $() for special jQuery-only functions.(基本上，我们需要$()用于特殊的仅jQuery函数。) Is this correct?(这个对吗？)   ask by Kevin Wu translate from so

Answer 1

Yes you only need $() when you're using jQuery.(是的，使用jQuery时只需要$() 。)

If you want jQuery's help to do DOM things just keep this in mind.(如果您想要jQuery的帮助来做DOM事情，请记住这一点。) $(this)[0] === this Basically every time you get a set of elements back jQuery turns it into a jQuery object .(基本上，每次您返回一组元素时，jQuery都会将其转换为jQuery对象 。) If you know you only have one result, it's going to be in the first element.(如果您知道只有一个结果，它将在第一个元素中。) $("#myDiv")[0] === document.getElementById("myDiv"); And so on...(等等...)