图片上传并预览(IE，火狐浏览器兼容问题)

//上传图片预览效果的js实现

function setImagePreview() {

var docObj = document.getElementById("file1");

var imgObjPreview = document.getElementById("uploaded0");

if (docObj.files && docObj.files[0]) {

//火狐下，直接设img属性

imgObjPreview.style.width = '100px';

imgObjPreview.style.height = '100px';

//imgObjPreview.src = docObj.files[0].getAsDataURL();

//火狐7以上版本不能用上面的getAsDataURL()方式获取，需要一下方式

imgObjPreview.src = window.URL.createObjectURL(docObj.files[0]);

} else {

//IE下，使用滤镜

docObj.select();

var imgSrc = document.selection.createRange().text;

var localImagId = document.getElementById("localImag");

//必须设置初始大小

localImagId.style.width = "100px";

localImagId.style.height = "100px";

//图片异常的捕捉，防止用户修改后缀来伪造图片

try {

localImagId.style.filter = "progid:DXImageTransform.Microsoft.AlphaImageLoader(sizingMethod=scale)";

localImagId.filters.item("DXImageTransform.Microsoft.AlphaImageLoader").src = imgSrc;

} catch (e) {

alert("您上传的图片格式不正确，请重新选择!");

return false;

}

imgObjPreview.style.display = 'none';

document.selection.empty();

}

return true;

}