SOURCE

<h2>.focusin()方法</h2>
    <div class="left">
        <div class="A ">
            点击聚焦：<input type="text" />
        </div>
    </div>
    <div class="right">
        <div class="B ">
            点击聚焦并传递参数：<input type="text" />
        </div>
    </div>
<script type="text/javascript">
        $("input:first").focusout(function() {
            $(this).css('border', '2px solid red')
            $(this).css('background', 'pink')
        })
    </script>

    <script type="text/javascript">

        function fn(e) {
            $(this).val(e.data)
        }

        function a() {
            $("input:last").focusout('慕课网', fn)
        }
        a();
    </script>

.left div,
        .right div {
            width: 500px;
            height: 50px;
            padding: 5px;
            margin: 5px;
            float: left;
            border: 1px solid #ccc;
        }
        
        .left div {
            background: #bbffaa;
        }
        
        .right div {
            background: yellow;
        }