图片上传前/时预览

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

图片上传前/时预览

原文：http://www.cnblogs.com/samwang88/p/9dddf9acfc788e6c16f60221028ec345.html