javascript - When we store a method in a variable and then call it, Why does the context object change to the global window object? -

-

नीचे उदाहरण jqfundamentals से लिया गया है, 

  var person = {firstName: 'Boaz' , अंतिमनाम: 'प्रेषक', नमस्कार: कार्य () {लॉग ('हाय,' + this.firstName); }}; Var sayIt = person.greet; // एक चर में विधि को स्टोर करें यह (); // logs 'हाय, अपरिभाषित' - उह-ओह   
 स्पष्टीकरण के रूप में,  
 जब हम एक चर में ग्रिट () विधि को संग्रहीत करते हैं तो इसे कहते हैं और फिर कॉल करें SayIt (), संदर्भ वस्तु वैश्विक विंडो ऑब्जेक्ट में बदल जाती है, व्यक्ति ऑब्जेक्ट नहीं। चूंकि खिड़की ऑब्जेक्ट में कोई प्रॉपर्टी नहीं है, इसलिए जब हम इसे एक्सेस करने का प्रयास करते हैं तो हम अनिर्धारित होते हैं।  
 मेरी समस्या है  
 जब हम एक वेरिएबल में ग्रिड () विधि को संचित करते हैं तो इसे कहते हैं और फिर कहते हैं यह () क्यों संदर्भ वस्तु वैश्विक विंडो ऑब्जेक्ट में बदलती है?   
 
 
 यह युक्ति है,    
 P> निम्न चरणों का पालन किया जाता है जब फ़ंक्शन ऑब्जेक्ट F में निहित फ़ंक्शन कोड के लिए निष्पादन संदर्भ में प्रवेश करता है, एक कॉलर यह प्रदान किया गया, और एक कॉलर प्रदान की गई तर्क:  
     
  1.  यदि फ़ंक्शन कोड  thisArg   thisArg  पर सेट करें।  
  2.  यदि  thisArg   null  या  अपरिभाषित ,     
          
     > इसलिए जब  सख्त मोड ,  यह  में  अपरिभाषित  संदर्भित होगा, अन्यथा यह वैश्विक ऑब्जेक्ट को संदर्भित करेगा।

Comments

Post a Comment

Popular posts from this blog

asp.net - Procedure or function "Procedure name" expects a parameter "Param name" which was not supplied occurs rarely -

-
I have a VB Net has a web service function that will send criteria to an SQL server stored function. Everything works perfectly for two months in the deployment machine. but now error The process or function GetEmployeeDetails is expected to have a parameter @progress which was not supplied 'P> posted on the machine Just came once. Everything works fine before and after the error. Web service code: public function GetLocation (ByVal as the oldNumber integer, ByVal integer as NewNumber, ByVal as the location string, Byval progress form In the form of a string, byVal name as string, byVal ID as string, try the string as Command1 = New SqlCommand ("GetEmployeeDetails" Connection1) with Command1. CommonType = CommandType Stored Surechers Parameter.ed ("@ old number", SQLDB type.int). Value = old number. Parameter.ed ("New Numer", SQLDB type.ins). Value = Newamer. Parameter. Add ("@Space", SQLBT Ype.VarChar, 10). Value = loc...
Read more

sql server ce - Is there some way to make sqlce3.5 and 4.0 co-exist in the C# project -

-
Currently, my user needs to downgrade their database from sqlce4.0 to sqlce3.5 for our application. , I found a post and it basically caters to my requirement except that the user needs intervention of both solutions, ideally I will target this target to automatically (i.e. users To create without any interference) I want to code a small tool to achieve this goal. So my idea is: 1. Since I know the schema of this DB, so I make an Sclc 3.5 empty DB first. 2. Then open the old SQL 4.0 db and the new escrow 3.5 db at the same time. , And then ask sqlce4.0 DB from the table table and insert them into the new sqlce3.5 dB. It sounds good, but when I try with the C # project, it seems that it can only add an SKL accessory reference (either V5 or V4.0). I know this ninth place has improved pollution. But how can I solve it? 3. Or if I have to export the data to the SQL file and then import it into SQL 3D DD? If some console utility is to impede which supports importing SQL data in sqlce...
Read more

jsp - No mapping found for HTTP request with URI with annotation config Spring MVC and Jetty -

-
Image
I'm only using annotation configuration, the server starts, but when I use some pages error is displayed: Warning: no mapping found for HTTP request with URI [/WEB-INF/view/main.jsp] name 'org.springframework.web.servlet.DispatcherServlet -D7259e with DispatcherServlet in Controller mapping works fine, but no JSP page is full. I am using Jetty 9.2.0.M0 and Spring MVC 4.0.4 release. JetTyP Config: Private Static Last String CONTEXT_PATH = "/"; Private Static Last String MAPPING_URL = "/ *"; Private Zero Server (Int port) throws exceptions {server server = new server (port); Server.addLifeCycleListener (New LifeCycleListener ()); Server.setHandler (getServletContextHandler (getContext ())); Server.start (); Server.join (); } Private static ServletContextHandler getServletContextHandler (WebApplicationContext context) throws IOException {LOGGER.info ( "ServletContextHandler is ready"); CircleContaxHandler themeHandler = new circactont...
Read more