纯JS实现slideToggle动画,慢慢下拉打开

没有存放页面的地方,借用别人的:http://www.zhangxinxu.com/study/201210/slide-transition-common-method.html

(1)CSS 设置动画时间,这是必须的

-webkit-transition: height 0.6s;
-moz-transition: height 0.6s;
-o-transition: height 0.6s;
transition: height 0.6s;
(2)JS设置 obj高度
 obj.style.height
(3)通过JS计算高度
 Array.prototype.slice.call(eleMore.childNodes).forEach(function(child) {
        if (child.nodeType === 1) {
            var oStyle = window.getComputedStyle(child);
            height = child.clientHeight + (parseInt(oStyle.borderTopWidth) || 0) + (parseInt(oStyle.borderBottomWidth) || 0);
        }
    });
demo:复杂代码保存htmL可以看效果

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="Content-type" name="viewport"
          content="initial-scale=1.0, maximum-scale=1.0, user-scalable=no, width=device-width">
    <meta http-equiv="Expires" content="0">
    <meta http-equiv="Pragma" content="no-cache">
    <meta http-equiv="Cache-control" content="no-cache">
    <meta http-equiv="Cache" content="no-cache">
    <title>Title</title>
    <style>
        .box {
            width: 400px; padding: 15px;  background-color: #f0f3f9;
        }
        .container {
            height: 0; position: relative;  overflow: hidden;
            -webkit-transition: height 0.6s;
            -moz-transition: height 0.6s;
            -o-transition: height 0.6s;
            transition: height 0.6s;
        }
        .container .wrap {
            border: 20px solid #333;
        }
        :root .container .wrap {
            /* 正统slide效果 */
            position: absolute;
            bottom: 0;
        }
    </style>
</head>
<body>


HTML代码:
<p>想看美女图片?<a href="javascript:" id="button" data-rel="more">点击我</a></p>
<div id="more" class="container">
    <div class="wrap">
        <img src="http://image.zhangxinxu.com/image/study/s/s256/mm1.jpg" height="191" />
        <img src="http://image.zhangxinxu.com/image/study/s/s256/mm1.jpg" height="191" />
        <p>我就是张含韵!</p>
        <p>我就是张含韵!</p>
    </div>
</div>
<script>
    var slideToggleTrans = function(element, display) { //  display表示默认更多展开元素是显示状态还是隐藏
        element.addEventListener("click", function() {

            display = !display;

            var  eleMore = document.querySelector("#more" );

            eleMore && (eleMore.style.height = display? (function() {
                var height = 0;
                Array.prototype.slice.call(eleMore.childNodes).forEach(function(child) {
                    if (child.nodeType === 1) {
                        var oStyle = window.getComputedStyle(child);
                        height = child.clientHeight + (parseInt(oStyle.borderTopWidth) || 0) + (parseInt(oStyle.borderBottomWidth) || 0);
                    }
                });
                return height;
            })() + "px": "0px");

        });

    };

    // 应用渐进使用transition交互的slideToggle效果
    slideToggleTrans(document.getElementById("button"));

</script>


</body>
</html>


你可能感兴趣的:(纯JS实现slideToggle动画,慢慢下拉打开)