编写reptitive函数的更好方法是什么？

Question

I have code that looks like this:

$('.item-one').mouseover(function() {
    $('.img-one').addClass('fit-img');
});

$('.item-two').mouseenter(function() {
    $('.img-two').addClass('fit-img');
});

$('.item-three').mouseenter(function() {
    $('.img-three').addClass('fit-img');
});

Is there a better way to write something like the above even though it works?

Answer 1

You can use a mix of common classes to group elements and data attributes to store meta data with the element. Try this:

 $('.item').mouseover(function() { var target = $(this).data('target'); $(target).addClass('fit-img'); }); 

 .img { display: none; width: 30px; height: 30px; } .img.fit-img { display: block; } .img-one { background-color: red; } .img-two { background-color: green; } .img-three { background-color: blue; } 

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <a href="#" class="item" data-target=".img-one">one</a> <a href="#" class="item" data-target=".img-two">two</a> <a href="#" class="item" data-target=".img-three">three</a> <div class="img img-one"></div> <div class="img img-two"></div> <div class="img img-three"></div>