Apply, call
In JS, call and apply are meant to change the context in which a function is run, in other words, to change the this point within the function body.A big feature of JS is the notion that the context and runtime context and context can be changed when the function is defined.
function fruits () {}
fruits.prototype = {
color: ' Red ',
say:function () {console.log (' my color is ' + This.colo
Angularjs $scope inside the $watch (), $digest () and $apply () are the core functions of ANGULARJS, learning Angularjs must understand these functions.
When you bind a variable in $scope to view, Angularjs automatically creates a "Watch" inside it. "Watch" is used to monitor the change of variables in the ANGULARJS scope. You can create "watch" by calling the $scope. $watch () method.
$scope. The $digest () function iterates through all the watches
Take an example, explain the Call,apply,bind method in JavaScript, for everyone's reference, the specific contents are as follows
Why What's call,apply,bind doing? Why do you want to learn this?
This is generally used to specify the environment, which is usually problematic before it is learned.
var a = {
User: "Dream child",
fn:function () {
console.log (this.user);
}
}
Few simple JavaScript operations will use the call and apply functions, and in other larger operations such as Web application development, JS Framework development may often encounter these two functions. On the interpretation of these two functions, there are a lot of information on the Internet, but I think a lot of information is either scripted or highly similar, lack of grounding gas interpretation. I then tried to explain the two functions in a
Scala is a static type of scripting language built on the JVM, and scripting languages always have some conventions to enhance flexibility. Flexibility allows the person who has mastered it to be a duck in the hand, as well as a beginner. For example, Scala has such a convention in the method invocation for the DSL to mate:
In the case where the receiver of the method call is defined, the point and parenthesis can be omitted when the method has only one argument. such as "0 to 2", the actual ful
A.call and apply method detailed--------------------------------------------------------------------------------
Call Method:
Syntax: Call ([thisobj[,arg1[, arg2[, [,. argn]]]]
Definition: Invokes one method of an object, replacing the current object with another object.
Description: The call method can be used to invoke a method instead of another object. The call method can change the object context of a function from the initial context to the
The first argument to call () and apply () is the object of the function to invoke, which is the value of this keyword in the function body.
The remaining arguments for call () are the values passed to the function to be invoked.
The structure is as follows: Call ([thisobj[,arg1[, arg2[, [,. argn]]]]
The first parameter of the call () method is the same as the Apply () method, but the arguments passed to
First, overview:
The specific meaning of the Python apply function is as follows:Apply (func [, args [, Kwargs]]) functions are used to invoke functions indirectly when function arguments already exist in a tuple or dictionary . Args is a tuple that contains the arguments that are passed by location that will be supplied to the function. If args is omitted, no arguments are passed, Kwargs is a dictionary that contains the keyword parameters.The retur
One, the object inheritance in JS
There are three ways of inheriting in JS
1.js Prototype (prototype) Implementation inheritance
Copy Code code as follows:
2. Constructor implementation inheritance
Copy Code code as follows:
3.call, apply to implement inheritance
Copy Code code as follows:
Ii. use of Call and apply (detailed introduction)
JS call and
:" +arguments.callee.length);
}
}
Recursive computation
var sum = function (n) {
if (n
return 1;
Else
return n +arguments.callee (n-1)
}
A more general recursive function:
var sum = function (n) {
if (1==n) return 1;
else return n + sum (n-1);
When invoked: Alert (SUM (100));
Inside the function contains a reference to sum itself, the function name is just a variable name, within the function call sum is equivalent to call
A global variable, it is not very good to reflect the ca
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Tools Software Tutorials
Users who are still in the membership period after October 20, 2016 will receive a full refund: the user purchased within the last 3 months will be automatically returned through the original purchase channel; More than 3 months to buy or through the Apple product channel to buy users, manual in the official website member record "", "" or kefu@360.cn customer service bo
Copy Code code as follows:
Callee can print its own
function Calleedemo () {
alert (Arguments.callee);
}
Used to validate parameters
function Calleelengthdemo (arg1, arg2) {
if (arguments.length==arguments.callee.length) {
Window.alert ("Verify parameter and argument length is correct!") ");
Return
} else {
Alert ("Actual parameter length:" +arguments.length);
Alert ("Parameter length:" +arguments.callee.length);
}
}
Recursive computation
var sum =
In JavaScript, a function is an object. The this point in a function object determines how the function is invoked. You can use Apply,call and bind to change the point of this in the function object, before you say the difference or summarize the similarities of the three:1, are used to change the function of this object to point to.2, the first argument is the object to point to.3, all can use the subsequent parameters to pass the parameter.
Call Me
) {if (n return 1;Elsereturn n +arguments.callee (n-1)}A more general recursive function:
var sum = function (n) {if (1==n) return 1;else return n + sum (n-1);
When invoked: Alert (SUM (100));Inside the function contains a reference to sum itself, the function name is just a variable name, within the function call sum is equivalent to callA global variable, it is not very good to reflect the call itself, then use callee will be a better way.
Apply and
The first argument for call and apply is the parent object that is to invoke the function, which is the invocation context, which is used in the function body to obtain a reference to it.
For example, if you want to invoke the function f with the object O method, you can use the call and apply methods as follows:
Copy Code code as follows:
F.call (o);
F.apply (o);
The following code
PowerPoint 2013 ways to apply built-in theme styles
1, Start PowerPoint 2013, on the Design tab, click the other button in the subject group
, select the topic you want to use in the list of open topics to apply it to the slide, as shown in Figure 1.
Figure 1 Applying a theme
2, if you need to apply external theme styles, you can clic
What is the payment Bora staging
The payment of Bora phase combined with sesame information for the high credit group to provide phased services. Any sesame credit score of more than 650 people can log in to pay PO online application, online audit, through the loan, credit line with the user's good credit and gradually improve the maximum loan of 10000 yuan in cash.
Payment Bora Staging Features
1, to the stage is for the high credit group to provide phased service platform;
2, Se
apply filter conditions to quickly find the information they need.
1. Select "New" in the "File" menu and choose to create a new page or a new Web site.
2. In the task pane, select site mode (Web site Template).
3. Select the Database Interface Wizard (db Interface Wizard).
4. Select "Add to current Web site" and select "OK" button. Next, follow the instructions in the wizard to step through the steps to create the database and page.
Note: After co
) {
if (arguments.length==arguments.callee.length) {
Window.alert ("Verify parameter and argument length is correct!") ");
Return
} else {
Alert ("Actual parameter length:" +arguments.length);
Alert ("Parameter length:" +arguments.callee.length);
}
}
Recursive computation
var sum = function (n) {
if (n return 0;
Else
return n +arguments.callee (n-1)
}
A more general recursive function:
Copy Code code as follows:
var sum = function (n) {
if (n
asp.net|web| Control translation: t.t (tpoi)
in this article, I'll show you how to use the Web classes in the. NET Framework class Library to create and apply styles (style) for Web server controls.
System.Web.UI.WebControls.Style class
The style class is defined in the System.Web.UI.WebControls namespace to describe the style of a WEB server control. The properties of this class can set the appearance of Web server controls, or multiple W
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