html实现点击图片放大功能

About Code

<html>
<head>
    <style>
        .over {
            position: fixed;
            left: 0;
            top: 0;
            width: 100%;
            z-index: 100;
        }

        .tempContainer {
            position: fixed;
            width: 100%;
            margin-right: 0px;
            margin-left: 0px;
            text-align: center;
            z-index: 101;
        }
    </style>
    <script src="http://code.jquery.com/jquery-1.8.0.min.js"></script>
</head>
<body>
<div class="over"></div><!--背景层-->
<div class="logoImg amplifyImg"><!--注意：此处的amlifyImg不可少-->
    <img src="test.jpg"/><!-- 此处是引入图片的路径 -->
</div>
<script>
    $(document).ready(function () {
        var imgsObj = $('.amplifyImg img');//需要放大的图像
        if (imgsObj) {
            $.each(imgsObj, function () {
                $(this).click(function () {
                    var currImg = $(this);
                    coverLayer(1);
                    var tempContainer = $('<div class=tempContainer></div>');//图片容器
                    with (tempContainer) {//width方法等同于$(this)
                        appendTo("body");
                        var windowWidth = $(window).width();
                        var windowHeight = $(window).height();
                        //获取图片原始宽度、高度
                        var orignImg = new Image();
                        orignImg.src = currImg.attr("src");
                        var currImgWidth = orignImg.width;
                        var currImgHeight = orignImg.height;
                        if (currImgWidth < windowWidth) {//为了让图片不失真，当图片宽度较小的时候，保留原图
                            if (currImgHeight < windowHeight) {
                                var topHeight = (windowHeight - currImgHeight) / 2;
                                if (topHeight > 35) {/*此处为了使图片高度上居中显示在整个手机屏幕中：因为在android,ios的微信中会有一个title导航，35为title导航的高度*/
                                    topHeight = topHeight - 35;
                                    css('top', topHeight);
                                } else {
                                    css('top', 0);
                                }
                                html('<img border=0 src=' + currImg.attr('src') + '>');
                            } else {
                                css('top', 0);
                                html('<img border=0 src=' + currImg.attr('src') + ' height=' + windowHeight + '>');
                            }
                        } else {
                            var currImgChangeHeight = (currImgHeight * windowWidth) / currImgWidth;
                            if (currImgChangeHeight < windowHeight) {
                                var topHeight = (windowHeight - currImgChangeHeight) / 2;
                                if (topHeight > 35) {
                                    topHeight = topHeight - 35;
                                    css('top', topHeight);
                                } else {
                                    css('top', 0);
                                }
                                html('<img border=0 src=' + currImg.attr('src') + ' width=' + windowWidth + ';>');
                            } else {
                                css('top', 0);
                                html('<img border=0 src=' + currImg.attr('src') + ' width=' + windowWidth + '; height=' + windowHeight + '>');
                            }
                        }
                    }
                    tempContainer.click(function () {
                        $(this).remove();
                        coverLayer(0);
                    });
                });
            });
        } else {
            return false;
        }

        //使用禁用蒙层效果
        function coverLayer(tag) {
            with ($('.over')) {
                if (tag == 1) {
                    css('height', $(document).height());
                    css('display', 'block');
                    css('opacity', 1);
                    css("background-color", "#FFFFFF");
                    css("background-color", "rgba(0,0,0,0.7)");  //蒙层透明度
                } else {
                    css('display', 'none');
                }
            }
        }
    });
</script>
</body>
</html>

over over

posted @ 2019-03-23 10:37  为牧  阅读(50582)  评论(14)  编辑  收藏  举报