https://www.cnblogs.com/jzxy/articles/15556998.html
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title></title>
</head>
<body>
<input id="fileuploadBatch1" type="file" name="batchImg" multiple="multiple" onchange="multipleUploadImg(this)">
批量上传
</body>
</html>
<script>
//选择图片，马上预览
function multipleUploadImg(obj) {
var fl = obj.files.length;
console.log("obj", obj, obj.files);
for (var i = 0; i < fl; i++) {
var file = obj.files[i];
console.log(file)
var formData = new FormData();
formData.append('imgFile', file);
}
}
</script>