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判断鼠标的移入方向

2024-10-07 04:38:02   219人阅读

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style media="screen">
        body {
            height: 3000px;
        }
        
        * {
            padding: 0;
            margin: 0;
        }
        
        ul {
            list-style: none;
            position: relative;
            font-size: 0;
            width: 600px;
            margin: 50px auto 0;
        }
        
        ul>li {
            position: relative;
            width: 300px;
            height: 300px;
            background-color: rgb(213, 213, 213);
            display: inline-block;
            margin: 10px;
            overflow: hidden;
        }
        
        ul>li .bg {
            position: absolute;
            width: 100%;
            height: 100%;
            left: -100%;
            top: 0;
            background-color: red;
            text-align: center;
            line-height: 300px;
            cursor: pointer;
            color: #fff;
            font-size: 20px;
        }
        
        .line {
            position: absolute;
            width: 50%;
            height: 1px;
            background: red;
            right: 0;
            top: 50%;
            transition: all .3s;
            transform-origin: left;
        }
        
        .res {
            text-align: center;
        }
        
        ul>li.fix {
            width: 200px;
            height: 300px;
        }
    </style>
</head>

<body>
    <ul>
        <li>
            <div class="bg">
                111111111111
            </div>
        </li>
        <li class="fix">
            <div class="bg">
                22222222222222
            </div>
        </li>
        <li>
            <div class="bg">
                333333333333
            </div>
        </li>

    </ul>
    <div class="res"></div>
    <script src="http://libs.baidu.com/jquery/1.8.3/jquery.min.js"></script>
    <script>
        $("li").on("mouseenter mouseleave", function(e) {
            var $bg = $(this).find(‘.bg‘);
            var w = this.offsetWidth; //获取元素宽度
            var h = this.offsetHeight; //获取元素高度
            var toTop = this.getBoundingClientRect().top + document.body.scrollTop; //兼容滚动条

            var x = (e.pageX - this.getBoundingClientRect().left - (w / 2)) * (w > h ? (h / w) : 1); //获取当前鼠标的x轴位置（相对于这个li的中心点）
            var y = (e.pageY - toTop - h / 2) * (h > w ? (w / h) : 1);
            var direction = Math.round((((Math.atan2(y, x) * 180 / Math.PI) + 180) / 90) + 3) % 4; //direction的值为“0,1,2,3”分别对应着“上，右，下，左”   // /90矩形矫正 成正方形---》 为正方形的情况
            //  Math.round(x/90) --->(0,1)  + 3 刚好对应四个象限


            var eventType = e.type;
            var res = Math.atan2(y, x) / (Math.PI / 180) + 180; // +180 ------》 （-180,180） -----》（0,360）
            // $(‘.line‘).css(‘transform‘, ‘rotate(‘ + res + ‘deg)‘);

            var dirName = [‘上方‘, ‘右侧‘, ‘下方‘, ‘左侧‘];


            if (eventType == ‘mouseenter‘) {
                $(‘.res‘).text(dirName[direction] + ‘进入‘);
                animationIn(direction, $bg);
            } else {
                $(‘.res‘).text(dirName[direction] + ‘离开‘);
                animationOut(direction, $bg);
            }
        });

        function animationIn(direction, ele) {

            switch (direction) {
                case 0:
                    ele.css({
                        left: 0,
                        top: ‘-100%‘
                    }).stop().animate({
                        top: 0
                    }, 300);
                    break;
                case 1:
                    ele.css({
                        left: ‘100%‘,
                        top: 0
                    }).stop().animate({
                        left: 0
                    }, 300);
                    break;
                case 2:
                    ele.css({
                        left: 0,
                        top: ‘100%‘
                    }).stop().animate({
                        top: 0
                    }, 300);
                    break;
                case 3:
                    ele.css({
                        left: ‘-100%‘,
                        top: 0
                    }).stop().animate({
                        left: 0
                    }, 300);
                    break;
            }
        }

        function animationOut(direction, ele) {
            switch (direction) {
                case 0:
                    ele.stop().animate({
                        top: ‘-100%‘
                    }, 300);
                    break;
                case 1:
                    ele.stop().animate({
                        left: ‘100%‘
                    }, 300);
                    break;
                case 2:
                    ele.stop().animate({
                        top: ‘100%‘
                    }, 300);
                    break;
                case 3:
                    ele.stop().animate({
                        left: ‘-100%‘
                    }, 300);
                    break;
            }

        }
    </script>

</body>

</html>

 

判断鼠标的移入方向


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