Thanks for the invitation, yes. It is available in the WeChat demo. The localid can be displayed directly in src.

I don’t know if the WeChat interface will work. But the code below will definitely work

<input type="file" accept="image/*" value="点击上传" onchange="preview($event)"/>
<img src="" id="previewImg">
<script>
    function preview($event) {
        const $target = $event.target
        if ($target.files && $target.files[0]){
            const reader = new FileReader();
            reader.readAsDataURL($target.files[0]);
            reader.onload = function(evt){
                document.getElementById('previewImg').setAttribute('src', evt.target.result)
                // 上传
                // 向服务器发送$target.files[0]
            }

        }
    }
</script>