function apply

Pager 1. function Call the function and change the point of This2. Grammar function name. Call (Thisarg,arg1,arg2 ...) 3. Parameters　　　 The value of this point in the Thisarg function arg1,arg2 ... Starting with the second argument

Apply, callIn JavaScript, call and apply are meant to change the context in which a function is run, in other words, to change the direction of this within the function body.A major feature of JavaScript is the notion that a function has a "context

Previous wordsNow, the preprocessor (such as sass) seems to have become standard for developing CSS, just as jquery was developed as standard for JS a few years ago. JS's queryselector draw on the idea of jquery's selector, CSS selectors also draw

Array_change_key_case ($arr, Case_lower | | Case_upper) returns an array whose key names are all uppercase or lowercase Array_rand ($arr, num) randomly extracts one or more cells from an array Shuffle (& $arr) scrambling the array Array_chunk ($arr,

arr1 = [' A ', ' B ', ' C ']ARR2 = [' 1 ', ' 2 ', ' 3 ']Inserts the array arr2 into the array arr1 after the second element B;Ideas:Inserting a specific position, we first think of splice, but not directly splice (2, 0, arr2), the result: [' A ', '

In the use of Python for system management, especially the simultaneous operation of multiple file directories, or remote control of multiple hosts, parallel operation can save a lot of time. When the number of objects is small, can be directly used

Set_error_handler () PHP provides a functional function of custom error handling handles Set_error_handler () from 4.1.0, but very few scripting people know. Set_error_handler This function is a good way to prevent the wrong path from leaking, and

Original blog: https://www.cnblogs.com/pssp/p/5216085.htmlThe first thing to say is thatthe point of this is not deterministic at the time of the function definition, and only when the function is executed can you determine who the this is pointing

properties inside the function: arguments and this are two special objects inside the function arguments:function recursion (num) {if (num=1) {return 1; }else{return num*recursion (num-1); }} Another notation: function recursion (num) {if (num=1)

Select title:Fill in the blanks questions:Question and Answer question:1. What is JavaScript? (This is the basic problem, for many programmers is also send sub-problem!) ）JavaScript is a client and server-side scripting language that can be inserted

Recently in the interface code used to Json_encode, found on the internet said Json_encode encoding set to UTF-8 Chinese will not garbled, verified that this method is really effective, but do not know why, the code after a period of time is not

The Set_error_handler () function sets the user-defined error-handling function. This function is used to create the user's own error handling for the Run-time period. The function returns the old error handler, or null if it fails. Let's take a

6. Execution Environment and scope (1) Execution Environment (execution context): All JavaScript code runs in an execution environment, and when control is transferred to JavaScript executable code, it enters an execution environment. The

The first thing you have to say is that this point is not certain when the function is defined, only when the function is executing to determine who it is pointing to, and actually this is ultimately pointing to the object that called it (there are

First, the cause That day to Prototype.js opened to see, only to see a few lines on the full head fog, the reason is not very familiar with the object-oriented JS, so Baidu +google a handful, finally count small have harvest, write this

Concept : Threads are multitasking structures that share process address space to create a thread-related function : 1. int pthread_create (pthread_t *thread, const pthread_attr_t *attr, void * (*start_routine) (void *), void *arg); Parameter 1:

This article illustrates the use of PHP to return JSON data functions and share them for your reference. The specific methods are as follows: Json_encode () function usage: echo json_encode (Array (' A ' => ' bbbb ', ' C ' => ' ddddd ');

Recently in the interface code used to Json_encode, found on the internet that Json_encode encoding set to UTF-8 Chinese will not garbled, after the verification of this method is indeed effective, but do not know why, the code in the use of a

Gd_info function: Get information on the currently installed GD librarygetimagesize function: Gets the size of the imageImage_type_to_extension function: Gets the file suffix of the image typeImage_type_to_mime_type function: To determine the MIME

Classification of objectsObject lookup, that is, within the scope of a piece of executable code, to find an object that is currently needed. In Web effects, the objects that need to be looked up can be grouped into 3 different types: Variable