AndroidToastForJs aj;
aj = new AndroidToastForJs(WebViewActivity.this, webview);
        webview.addJavascriptInterface(aj, "AppNativeInterface");//JS交互

public class AndroidToastForJs {
    private Context mContext;
    private comdgdfg.example.android.mcworld.WebViewNoScroll mWebView;

    // 初始化方法
    public AndroidToastForJs(Context context, comdgdfg.example.android.mcworld.WebViewNoScroll myweb) {
        this.mContext = context;
        this.mWebView = myweb;
    }
    /**
     * 用于前端自己跳转h5页面方法
     * url:加载的网址
     * titleText：标题名称
     * titleType：标题栏显示类型
     * */
    @JavascriptInterface
    public void toAppHTML() {
        Toast.makeText(mContext,"调通了",Toast.LENGTH_LONG).show();
    }
}

getData = function(uid) {
        alert(uid);
        AppNativeInterface.toAppHTML();
        $.ajax({
            url:"http://192.168.1.169:9543/auth/login",
            data:JSON.stringify({
                username:"liangtou",
                password:"admin"
            }),
            type:"POST",
            contentType: "application/json; charset=utf-8",
            dataType:"json", //返回数据的类型
            success:function(re){
                console.log(re);  //在console中查看数据
                alert('success!');
            },
            error:function(re){
                alert(JSON.stringify(re));
            },
        });
    }