x5WebView?.let {
    it.webViewClient = object : WebViewClient() {
	    override fun onPageFinished(
	           view: WebView,
	           url: String
	       ) {
	           super.onPageFinished(view, url)
	           postSafeDelayed(1000) {
	               loading_pb.visibility = View.GONE
	           }
	           //頁(yè)面加載完判斷是否到底部邏輯
	           view.post {
	                view.measure(0, 0)
	                val htmlContentHeight: Int = view.getMeasuredHeight()
	                val viewHeight: Int = view.getHeight()
	                //如果html高度小于控件高度，那么說(shuō)明一屏可以展示下直接顯示關(guān)閉按鈕
	                if(htmlContentHeight <= viewHeight){
	                	// TODO 顯示關(guān)閉按鈕
	                }else{
	                //這里說(shuō)明有滾動(dòng)條，就需要監(jiān)聽(tīng)滾動(dòng)事件
	                	view?.setOnCustomScrollChangedListener(object : WebView.CustomScrollChangeListener{
                        override fun onScrollChange(
                            scrollX: Int,
                            scrollY: Int,
                            oldScrollX: Int,
                            oldScrollY: Int
                        ) {
                            Timber.w("setOnCustomScrollChangedListener 滾動(dòng)底部，html高度:${htmlContentHeight},scrollY:${scrollY}")
                            //已經(jīng)處于底端
                            if(htmlContentHeight - (viewHeight + scrollY) <= 0){
                                Timber.w("setOnCustomScrollChangedListener 到達(dá)底部")
                                //TODO 到達(dá)底部
                            }
                        }
                    })
	                }
                
				}
	       }
	   	}
  }
}