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html实现点击图片放大功能

程序员文章站 2024-03-20 20:57:34
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<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>
相关标签: js html5 css