移动端 js 实现图片上传预览

方法一：

<html xmlns="http://www.w3.org/1999/xhtml">

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <title>测试页面</title>

        <script type="text/javascript">

        //图片预览功能

            function previewImage(file, imgNum)

            {

                var MAXWIDTH = 200;

                var MAXHEIGHT = 200;

                var div = document.getElementById('preview' + imgNum);

                if (file.files && file.files[0])

                {

                    div.innerHTML = '<img id=imghead' + imgNum + '>';

                    var img = document.getElementById('imghead' + imgNum + '');

                    img.onload = function() {

                        var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);

                        img.width = rect.width;

                        img.height = rect.height;

        //         img.style.marginLeft = rect.left+'px';

                        img.style.marginTop = rect.top + 'px';

                    }

                    var reader = new FileReader();

                    reader.onload = function(evt) {

                        img.src = evt.target.result;

                    }

                    reader.readAsDataURL(file.files[0]);

                }

                else //

                {

                    var sFilter = 'filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src="';

                    file.select();

                    var src = document.selection.createRange().text;

                    div.innerHTML = '<img id=imghead' + imgNum + '>';

                    var img = document.getElementById('imghead2');

                    img.filters.item('DXImageTransform.Microsoft.AlphaImageLoader').src = src;

                    var rect = clacImgZoomParam(MAXWIDTH, MAXHEIGHT, img.offsetWidth, img.offsetHeight);

                    status = ('rect:' + rect.top + ',' + rect.left + ',' + rect.width + ',' + rect.height);

                    div.innerHTML = "<div id=divhead" + imgNum + " style='width:" + rect.width + "px;height:" + rect.height + "px;margin-top:" + rect.top + "px;" + sFilter + src + "\"'></div>";

                }

            }

            function clacImgZoomParam(maxWidth, maxHeight, width, height) {

                var param = {top: 0, left: 0, width: width, height: height};

                if (width > maxWidth || height > maxHeight)

                {

                    rateWidth = width / maxWidth;

                    rateHeight = height / maxHeight;

                    if (rateWidth > rateHeight)

                    {

                        param.width = maxWidth;

                        param.height = Math.round(height / rateWidth);

                    } else

                    {

                        param.width = Math.round(width / rateHeight);

                        param.height = maxHeight;

                    }

                }

                param.left = Math.round((maxWidth - param.width) / 2);

                param.top = Math.round((maxHeight - param.height) / 2);

                return param;

            }

        </script>

    </head>

    <body>

        <div class="yanzRight">

            <input type="file" value="打开摄像头" title="摄像头" capture="camera" accept="image/*" onchange="previewImage(this, 5)" id="cameraInput">

                <input style="margin-top:5px;float: left;" id="st18" name="evidence" onchange="previewImage(this, 5)" type="file"/>

                <span class="dui" id="imgOrder_dui" style="display: none;"></span>

        </div>

        <div id="preview5" style="margin-left:150px;clear:both; padding-top:15px;">

            <img src="" alt="" id="imghead5" height="200" width="200" style="display:none;"/>

        </div>

    </body>

</html>

方法二：

<html xmlns="http://www.w3.org/1999/xhtml">

    <head>

        <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />

        <title>测试页面</title>

        <script type="text/javascript">

            //下面用于多图片上传预览功能

            function setImagePreviews(avalue) {

                var docObj = document.getElementById("doc");

                var dd = document.getElementById("dd");

                dd.innerHTML = "";

                var fileList = docObj.files;

                for (var i = 0; i < fileList.length; i++) {

                    dd.innerHTML += "<div style='float:left' > <img id='img" + i + "'  /> </div>";

                    var imgObjPreview = document.getElementById("img" + i);

                    if (docObj.files && docObj.files[i]) {

                        //火狐下，直接设img属性

                        imgObjPreview.style.display = 'block';

                        imgObjPreview.style.width = '150px';

                        imgObjPreview.style.height = '180px';

                        //imgObjPreview.src = docObj.files[0].getAsDataURL();

                        //火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式

                        imgObjPreview.src = window.URL.createObjectURL(docObj.files[i]);

                    }

                    else {

                        //IE下，使用滤镜

                        docObj.select();

                        var imgSrc = document.selection.createRange().text;

                        alert(imgSrc)

                        var localImagId = document.getElementById("img" + i);

                        //必须设置初始大小

                        localImagId.style.width = "150px";

                        localImagId.style.height = "180px";

                        //图片异常的捕捉，防止用户修改后缀来伪造图片

                        try {

                            localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";

                            localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;

                        }

                        catch (e) {

                            alert("您上传的图片格式不正确，请重新选择!");

                            return false;

                        }

                        imgObjPreview.style.display = 'none';

                        document.selection.empty();

                    }

                }

                return true;

            }

        </script>

    </head>

    <body>

        <div style="margin :0px auto; width:990px;">

            <input type="file"  name="file" id="doc" multiple="multiple"  style="width:150px;" onchange="javascript:setImagePreviews();" accept="image/*" />

            <div id="dd" style=" width:990px;"></div>

        </div>

    </body>

</html>

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