练习2-2,你好,请问index()-'1'的作用是什么?谢谢

来源：2-2 编程练习

weibo_执著的弧线_0

2019-03-31 14:54:58

其中代码段:$('div').eq($(this).index()-'1')

<!DOCTYPE html>
<html>

<head>
    <meta charset="UTF-8">
    <title>点击事件</title>
    <style type="text/css">
        div {
            float: left;
            margin: 10px;
            width: 100px;
            height: 100px;
            color: #fff;
            font-size: 50px;
            text-align: center;
            line-height: 100px;
            text-indent: -9999px;
            background-color: #333;
        }
    </style>
</head>

<body>
<h1>添加事件处理</h1>
<div>43</div>
<div>21</div>
<div>56</div>
<div>16</div>
<div>89</div>
<div>94</div>
<div>46</div>
<div>26</div>
<div>67</div>
<div>90</div>
<div>25</div>
<div>10</div>
<div>84</div>
<div>76</div>
<script src="https://cdn.bootcss.com/jquery/3.3.1/jquery.js"></script>
<script>
    $(document).ready(function () {
        $('div').click(function () {

            $('div').eq($(this).index()-'1').css({'textIndent':'0'}).siblings().css({'textIndent':'-9999px'});
        });


    })//此处写代码
</script>
</body>
</html>

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