js实现图片上传预览

     <!DOCTYPE html>

     <html>

    <head>

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

    <style type="text/css">

     #preview, .img, img

     {

     width:200px;

     height:200px;

     }

     #preview

     {

    border:1px solid #;

    }

     </style>

     </head>

    <body>

     <div id="preview"></div>

    <input type="file" onchange="preview(this)" />

     <script type="text/javascript">

     function preview(file)

     {

     var prevDiv = document.getElementById('preview');

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

     {

     var reader = new FileReader();

     reader.onload = function(evt){

     prevDiv.innerHTML = '<img' +' style='+'"width: 100px;height: 100px"'+' src="' + evt.target.result + '" />'; 

    }

     reader.readAsDataURL(file.files[]);

    }

     else

     {

     prevDiv.innerHTML = '<div class="img" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src=\'' + file.value + '\'"></div>';

     }

     }

     </script>

     </body>

     </html>
巴特西

js实现图片上传预览

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