file上传图片预览（此方法支持app）

<div class="xiantu">
    <input type="file" id="file">
    <img src="../image/111.png" alt="" width="100%" height="100%" class="img1">
</div>

<img src="" alt="" id="divv" >

<script>
$("#file").change(function() {
    var $file = $(this);
    var fileObj = $file[0];
    var windowURL = window.URL || window.webkitURL;
    var dataURL;
    var $img = $("#divv");
    if(fileObj && fileObj.files && fileObj.files[0]){
        $img.css('display','block')
        dataURL = windowURL.createObjectURL(fileObj.files[0]);
        $img.attr('src',dataURL);
    }else{
        dataURL = $file.val();
        $img.css('display','block')
        var imgObj = document.getElementById("divv");
        imgObj.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
        imgObj.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = dataURL;

    }
});








</script>