if (fileInputObj.files && fileInputObj.files[0])
{
    var reader = new FileReader();
    reader.onload = function(evt){
        prevDiv.innerHTML = ‘<div id="flowChart"><img src="http://www.mamicode.com/‘ + evt.target.result + ‘" /></div>‘;
    }
    reader.readAsDataURL(fileInputObj.files[0]);
} else {
    //prevDiv.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";
    //prevDiv.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = http://www.mamicode.com/fileInputObj.value;
    prevDiv.innerHTML = ‘<div id="flowChart" style="filter:progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale,src=http://www.mamicode.com/‘‘ + fileInputObj.value + ‘/‘"></div>‘;
}

图片上传前/时预览