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js前端实现多图图片上传预览
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>测试页面</title>
<script type="text/javascript">
//下面用于多图片上传预览功能
function setImagePreviews(avalue) {
var docObj = document.getElementById("doc");
var dd = document.getElementById("dd");
dd.innerHTML = "";
var fileList = docObj.files;
for (var i = 0; i < fileList.length; i++) {
dd.innerHTML += "<div style=‘float:left‘ > <img id=‘img" + i + "‘ /> </div>";
var imgObjPreview = document.getElementById("img"+i);
if (docObj.files && docObj.files[i]) {
//火狐下，直接设img属性
imgObjPreview.style.display = ‘block‘;
imgObjPreview.style.width = ‘150px‘;
imgObjPreview.style.height = ‘180px‘;
//imgObjPreview.src = http://www.mamicode.com/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 = http://www.mamicode.com/window.URL.createObjectURL(docObj.files[i]);
}
else {
//IE下，使用滤镜
docObj.select();
var imgSrc = http://www.mamicode.com/document.selection.createRange().text;
alert(imgSrc)
var localImagId = document.getElementById("img" + i);
//必须设置初始大小
localImagId.style.width = "150px";
localImagId.style.height = "180px";
//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 = http://www.mamicode.com/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;
}
</script>
</head>
<body>
<div style="margin :0px auto; width:990px;">
<input type="file" name="file" id="doc" multiple="multiple" style="width:150px;" onchange="javascript:setImagePreviews();" accept="image/*" />
<div id="dd" style=" width:990px;"></div>
</div>
</body>
</html>
js前端实现多图图片上传预览