移动端点击图片放大

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <meta name="viewport" content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
</head>
<style type="text/css">
body{overflow: hidden}
*{margin:0;padding:0;list-style: none}
    /*img{width: 50%}*/
}
</style>
<body>
    <div class="add_photo">
        <ul>
            <li class="li_images">
                <img src="20171217155857.jpg" class="item_img">
            </li>
            <li class="li_images">
                <img src="images/2.jpg" class="item_img">
            </li>
        </ul>
</div>
<script src='jquery-1.11.3.js'></script>

<script type="text/javascript">
        $.fn.ImgZoomIn = function () {
            var window_h = $(window).height();
            var scroll_h = $(window).scrollTop();

            bgstr = '<div id="ImgZoomInBG" style="position: absolute;filter:Alpha(Opacity=70); opacity:0.7;z-index: 10000;background-color: #000;display: none;"></div>';
            imgstr = '<img id="ImgZoomInImage" src="' + $(this).attr('src')+'" style="cursor:pointer; display:none; position:absolute; z-index:10001;" />';
            if ($('#ImgZoomInBG').length < 1) {
                $('body').append(bgstr);
            }
            if ($('#ImgZoomInImage').length < 1) {
                $('body').append(imgstr);
            }
            else {
                $('#ImgZoomInImage').attr('src', $(this).attr('src'));
            }

            $('#ImgZoomInBG').css('top', scroll_h+'px');
            $('#ImgZoomInBG').css('width', '100%');
            $('#ImgZoomInBG').css('height', window_h+'px');

            $('#ImgZoomInImage').css('width', '100%');
            $('#ImgZoomInImage').css('height', (window_h/2)+'px');
            $('#ImgZoomInImage').css('top', (scroll_h+window_h/4)+'px');

            $('#ImgZoomInBG').show();
            $('#ImgZoomInImage').show();
        };
// PC端
        $(document).ready(function () {
            $(document).on('click','.item_img',function (){
                $(this).ImgZoomIn();
                $(document.body).css({
                    "overflow-x":"hidden",
                    "overflow-y":"hidden"
                });
            });

            $(document).on('click','#ImgZoomInImage',function(){
                $('#ImgZoomInImage').hide();
                $('#ImgZoomInBG').hide();
                $(document.body).css({
                    "overflow-x":"auto",
                    "overflow-y":"auto"
                });
            });
        });
// 手机端
        $(document).ready(function () {
            $(document).on('touchend','.item_img',function (t){
                $(this).ImgZoomIn();
                document.ontouchstart=function(){
                    return false;
                }
                t.preventDefault();
            });

            $(document).on('touchend','#ImgZoomInImage',function(t){
                $('#ImgZoomInImage').hide();
                $('#ImgZoomInBG').hide();
                document.ontouchstart=function(){
                    return true;
                }
                t.preventDefault();
            });
        });
    </script>
</body>
</html>
移动端点击图片放大

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