我查了定义,但所有这些看起来都令人困惑。对不起,我是一个非常新的人,如果有更简单的方法,我会这样做
答案 0 :(得分:2)
代码块是一组将作为一个单元运行的语句。
例如:
if (condition):
#statement1
#statement2
#statement3
else:
#statement4
#statement5
#statement6
您会发现语句1,2,3 具有相同的缩进,因此属于同一个块。 类似的陈述4,5,6 是另一个块。
您可以参考:
https://docs.python.org/3/reference/executionmodel.html
http://www.peachpit.com/articles/article.aspx?p=1312792&seqNum=3
答案 1 :(得分:1)
当我们说“阻止”时,我们指的是嵌套在另一个语法元素(如方法或函数)或package com.techshala.ramyakmehra.flashsalehelper;
public class MainActivity extends AppCompatActivity {
WebView wv;
@Override
public void onBackPressed() {
if (wv.canGoBack()) {
wv.goBack();
;
} else {
super.onBackPressed();
;
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
wv = ((WebView) findViewById(R.id.webview));
wv.setFocusable(true);
wv.setFocusableInTouchMode(true);
wv.getSettings().setAppCacheEnabled(true);
wv.getSettings().setUserAgentString("Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36");
wv.getSettings().setJavaScriptEnabled(true);
wv.getSettings().setBuiltInZoomControls(true);
wv.getSettings().setUseWideViewPort(true);
wv.setScrollbarFadingEnabled(false);
if (Build.VERSION.SDK_INT >= 19) {
WebView.setWebContentsDebuggingEnabled(true);
CookieManager.getInstance().setAcceptCookie(true);
}
wv.loadUrl("https://flipkart.com");
wv.setWebViewClient(new WebViewClient());
}
public void onPageFinished(WebView paramWebView, String paramString) {
if (Build.VERSION.SDK_INT >= 19) {
WebView.setWebContentsDebuggingEnabled(true);
CookieManager.getInstance().setAcceptCookie(true);
}
onPageFinished(paramWebView, paramString);
{
onPageFinished(paramWebView, paramString);
if (paramString.toLowerCase().equals("https://www.flipkart.com/account/login?ret=https%3A%2F%2Fwww.flipkart.com%2Faccount")) {
}
onPageFinished(paramWebView, paramString);
if (paramString.toLowerCase().equals("https://www.flipkart.com/account/")) {
wv.loadUrl("https://www.flipkart.com/operon-b57d-dew-bp-monitor/p/itmex9bqpzh4hdsn?pid=BPMEX9BQGRZHWXYT&lid=LSTBPMEX9BQGRZHWXYTWOV79S&marketplace=FLIPKART&srno=b_1_1&otracker=hp_omu_Deals%20of%20the%20Day_1_From%20%E2%82%B9%20749_5F6E9K1E29R8_0&fm=neo/merchandising&iid=5b332980-eab1-4e62-9cff-6946b49e71e4.BPMEX9BQGRZHWXYT.SEARCH&ppt=Store%20Browse&ppn=Search%20Page&ssid=kz8qhsw55s0000001524827753408");
}onPageFinished(paramWebView, paramString);
if (paramString.toLowerCase().contains("/p/")) {
wv.loadUrl("javascript: if ((document.getElementsByClassName('_2AkmmA _2Npkh4 _2MWPVK RpigiU') .length > 0) || (document.getElementsByClassName('_2AkmmA _2Npkh4 _2kuvG8 _7UHT_c') .length > 0)) { var listId = document.getElementsByClassName(\"niH0FQ _36Fcw_\")[0].childNodes[0].getAttribute(\"id\") .split('_')[1]; var hiddenEids = document.createElement(\"input\"); hiddenEids.setAttribute(\"type\", \"hidden\"); hiddenEids.setAttribute(\"name\", \"eids\"); hiddenEids.setAttribute(\"value\", listId); var hiddenOtracker = document.createElement(\"input\"); hiddenOtracker.setAttribute(\"type\", \"hidden\"); hiddenOtracker.setAttribute(\"name\", \"otracker\"); hiddenOtracker.setAttribute(\"value\", \"\"); var hiddenDomain = document.createElement(\"input\"); hiddenDomain.setAttribute(\"type\", \"hidden\"); hiddenDomain.setAttribute(\"name\", \"domain\"); hiddenDomain.setAttribute(\"value\", \"physical\"); var formtag = document.createElement(\"form\"); formtag.setAttribute(\"action\", \"/checkout/init\"); formtag.setAttribute(\"class\", \"buyform\"); formtag.setAttribute(\"method\", \"post\"); formtag.appendChild(hiddenDomain); formtag.appendChild(hiddenOtracker); formtag.appendChild(hiddenEids); document.body.appendChild(formtag); formtag.submit(); clearInterval(time); console.log(\"Script Activated\"); } else { console.log('button not found'); location.reload(); }");
}onPageFinished(paramWebView, paramString);
if (paramString.toLowerCase().contains("/checkout/init")) {
wv.loadUrl("javascript:setInterval(function() { if ((document.getElementsByClassName('_2AkmmA _7UHT_c').length > 0)) { document.getElementsByClassName('_2AkmmA _7UHT_c')[0].click() } if (document.getElementsByClassName('_3pZBmm _3C6tOa _1syowc').length == 0) { if (document.getElementsByClassName('_3uUUD5').length > 0) { document.getElementsByClassName('_3uUUD5')[0].click() } } }, 100)");
}
}
}
}
或if
之类的结构中的代码元素。
确切的定义取决于您的语言的语法树,即formally defined。
答案 2 :(得分:0)
所有程序都包含太多块。 块只是一个概念,你不能看作功能。 块是代码的结构,用于将代码的一部分与代码的另一部分分开。 函数是块。,类是块,内部由许多块组成。