why don't fire Unity.call(method, msg) on JS?

my html code

<script>Unity.call('CodeFromWeb','SOMETHING');</script>

my unity C# code

public void CodeFromWeb(string msg)
{
// SOMETHING.....................
}

I need to working this code. not by CallFromJS!

CWebViewPluginInterface
public void call(final String method, final String message) {
final Activity a = UnityPlayer.currentActivity;
a.runOnUiThread(new Runnable() {public void run() {
if (mPlugin.IsInitialized()) {
UnityPlayer.UnitySendMessage(mGameObject, method, message);
}
}});
}

ps.

my webview initializing code is same to sample's one. i don't forget this.

IEnumerator Start()
{
    webViewObject = gameObject.AddComponent<WebViewObject>();
    webViewObject.Init(
        cb: (msg) =>
        {
            Debug.Log(string.Format("CallFromJS[{0}]", msg));
        },
        err: (msg) =>
        {
            Debug.Log(string.Format("CallOnError[{0}]", msg));
        },
        started: (msg) =>
        {
            Debug.Log(string.Format("CallOnStarted[{0}]", msg));

            StopCoroutine(UpdateSlider());
            StartCoroutine(UpdateSlider());
        },
        ld: (msg) =>
        {
            Debug.Log(string.Format("CallOnLoaded[{0}]", msg));

#if !UNITY_ANDROID
// NOTE: depending on the situation, you might prefer
// the 'iframe' approach.
// cf. https://github.com/gree/unity-webview/issues/189
#if true
webViewObject.EvaluateJS(@"
if (window && window.webkit && window.webkit.messageHandlers && window.webkit.messageHandlers.unityControl) {
window.Unity = {
call: function(msg) {
window.webkit.messageHandlers.unityControl.postMessage(msg);
}
}
} else {
window.Unity = {
call: function(msg) {
window.location = 'unity:' + msg;
}
}
}
");
#else
webViewObject.EvaluateJS(@"
if (window && window.webkit && window.webkit.messageHandlers && window.webkit.messageHandlers.unityControl) {
window.Unity = {
call: function(msg) {
window.webkit.messageHandlers.unityControl.postMessage(msg);
}
}
} else {
window.Unity = {
call: function(msg) {
var iframe = document.createElement('IFRAME');
iframe.setAttribute('src', 'unity:' + msg);
document.documentElement.appendChild(iframe);
iframe.parentNode.removeChild(iframe);
iframe = null;
}
}
}
");
#endif
#endif
webViewObject.EvaluateJS(@"Unity.call('ua=' + navigator.userAgent)");
},
//ua: "custom user agent string",
enableWKWebView: true);

am i check some more?

Read CWebViewPluginInterface.call and the shown Unity initialization, then reproduce the JavaScript call on the target platform. Trace whether Unity.call and the C# CodeFromWeb callback are reached; done means the callback receives SOMETHING without relying on CallFromJS.