 
<!doctype html> 
<html> 
<head> 
<meta content="text/html; charset=UTF-8" http-equiv="Content-Type" /> 
<title>Image preview example</title> 
<script type="text/javascript"> 
var loadImageFile = (function () { 
if (window.FileReader) { 
var oPreviewImg = null, oFReader = new window.FileReader(), 
rFilter = /^(?:image\/bmp|image\/cis\-cod|image\/gif|image\/ief|image\/jpeg|image\/jpeg|image\/jpeg|image\/pipeg|image\/png|image\/svg\+xml|image\/tiff|image\/x\-cmu\-raster|image\/x\-cmx|image\/x\-icon|image\/x\-portable\-anymap|image\/x\-portable\-bitmap|image\/x\-portable\-graymap|image\/x\-portable\-pixmap|image\/x\-rgb|image\/x\-xbitmap|image\/x\-xpixmap|image\/x\-xwindowdump)$/i; 

oFReader.onload = function (oFREvent) { 
if (!oPreviewImg) { 
var newPreview = document.getElementById("imagePreview"); 
oPreviewImg = new Image(); 
oPreviewImg.style.width = (newPreview.offsetWidth).toString() + "px"; 
oPreviewImg.style.height = (newPreview.offsetHeight).toString() + "px"; 
newPreview.appendChild(oPreviewImg); 
} 
oPreviewImg.src = oFREvent.target.result; 
}; 

return function () { 
var aFiles = document.getElementById("imageInput").files; 
if (aFiles.length === 0) { return; } 
if (!rFilter.test(aFiles[0].type)) { alert("You must select a valid image file!"); return; } 
oFReader.readAsDataURL(aFiles[0]); 
} 

} 
if (navigator.appName === "Microsoft Internet Explorer") { 
return function () { 
alert(document.getElementById("imageInput").value); 
document.getElementById("imagePreview").filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = document.getElementById("imageInput").value; 

} 
} 
})(); 
</script> 
<style type="text/css"> 
#imagePreview { 
width: 160px; 
height: 120px; 
filter: progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale); 
} 
</style> 
</head> 
<body> 
<div id="imagePreview"> 
</div> 
<form name="uploadForm"> 
<p> 
<input id="imageInput" type="file" name="myPhoto" onchange="loadImageFile();" /><br /> 
<input type="submit" value="Send" /></p> 
</form> 
</body> 
</html> 

但是需要注意的是在IE8中由于IE8自作聰明的將真實(shí)路徑隱藏起來了用alert打印的結(jié)果是C:/fakepath/*.jpg 所以導(dǎo)致該方法無法使用

解決辦法是：進(jìn)入工具 -> Internet選項(xiàng) -> 安全 -> 自定義級別 -> 找到“其他”中的“將本地文件上載至服務(wù)器時(shí)包含本地目錄路徑”，選中“啟用”即可。

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