<div class="layui-input-block">
   <input type="file" accept="*/*" name="file" id="FileImg" onchange="xmTanUploadImg(this)">
    <img src="" id="avarimgs" width="50px" height="50px">
</div>

<script>
    function xmTanUploadImg(obj) {
        var file = obj.files[0];
        console.log("fileName:" + file.name)//文件名
        console.log("file.size = " + file.size);//文件大小
        var reader = new FileReader();
        reader.onload = function (e) {
            console.log(e)// 对象里面的target.result就是base64编码
            var img = document.getElementById("avarimgs");
            img.src = e.target.result;
//             $("#typeIcon").val(e.target.result)
        }
        reader.readAsDataURL(file)
    }
</script>