math functions in javascript with examples

From the very beginning, when I got started with js, I felt flexible. Everyone's writing methods were different. For example, a function has N types of writing: 1. function From the very beginning, when I got started with JavaScript, I felt flexible. Everyone's writing methods were different. For example, a function had N writing methods. For example: function showMsg () {}, var showMsg = function () {}, showMsg = function (){} There seems to be no di

it is a number, false is returned; otherwise, true is returned.* IsFinite (x) is used to check whether the parameter x is infinite or small. if it is infinite or small, true is returned.* ParseInt (x) is used to parse a string and return an integer.* ParseFloat (x) is used to parse a string and return a floating point number.* EncodeURI () and encodeURIComponent () perform special UTF-8 encoding on the string to avoid special characters for the browser to understand. The difference between the

This article mainly introduces the setTimeout () and clearTimeout () usage in js, and analyzes the functions and usage skills of setTimeout () and clearTimeout () in the form of instances, for more information about setTimeout () and clearTimeout () usage in js, see the examples in this article. Share it with you for your reference. The specific analysis is as follows: The setTimeout () method is used to

Object creation: When a function object is created, the function object produced by the functions constructor runs code similar to this: Copy Code code as follows: This.prototype={constructor:this}; Suppose function f f when constructing an object in new form, the object's constructor is set to this F.prototype.constructor If the function modifies the prototype of the function before the object is created, it affects the Const

)(); If you write xw. say. bind (xh) directly, there will be no results. Do you see the difference? Both call and apply are direct calls to functions, while the bind method returns a function. Therefore, you need to () to call the function later. So what is the difference between call and apply? Let's rewrite the example a little. Var xw = {name: "", gender: "male", age: 24, say: function (school, grade) {alert (this. name + "," + this. gender + ", t

Really to explain this thing, only to find that it is not so simple, spent some time, wrote a few small demo, let us come to a probe. Well, to artificial mirror, know gains and losses, it seems that this sentence is very reasonable. Royal CasinoIf it is a global function, this is equivalent to the Window object, and the various properties or methods defined in the function can be accessed outside the function, provided that the function needs to be called.If you use new to instantiate an object,

This article describes the functions and examples of isPrototypeOf functions in JavaScript. This article describes the functions and usage of isPrototypeOf functions and examples, you c

this, and the second is the sayColor array of function arguments. call (o2, 1, 2); // multiple parameters can be passed. The first one is the object that assigns a value for this, followed by a comma (,) for the function arguments. Basic packaging type There is a problem in the first article of this series: IV, Var obj1 = {}; obj1.name2 = "Zhang San"; var str1 = "test"; str1.name2 = "Li Si"; alert (obj1.name2 + "" + str1.name2 ); Why is this? Because the string packaging class is accessed wh

1. FunctionsThe definition of a function in the mass-user is this: a function is an event-driven or reusable block of code that executes when it is invoked. Admittedly, we don't get anything of value from this abstract definition. Here are some examples of how a function can be defined:function Add (NUM1, num2) { return NUM1 + num2;} var add = function (NUM1, num2) { return num1 + num2;} This is the more common two kinds of The following two spec

. The Math and Error objects do not have a valueOf method.Three. FunctionsA. The function is declared by using the Functions keyword followed by a set of parameters and the body of the function.function Sayhi (name,message) {Alter ("Hello" +name+ "," +message);}function invocation: Called by the function name, followed by a pair of parentheses and arguments.Sayhi ("Nike", "How is you today?");Any

. The most common method is to use a function statement to define a function, such: The Code is as follows: Function abc (){// Code to process}Function abc () {// code to process}Of course, your function can also contain parameters or even return values.View plaincopy to clipboardprint?Function abc (x, y ){Return x + y;}Function abc (x, y) {return x + y ;} However, no matter how you define your Function, the JS interpreter translates it into a Function object. For example, if you define the

This article introduces anonymous functions and closures in detail, provides detailed examples and precautions. It is a very good article and is recommended to you. 1. Anonymous Functions Functions are the most flexible objects in JavaScript. Here we will only explain the us

Before you mention the above concepts, first of all, let's talk about the implied parameters of functions in javascript: arguments Arguments The object represents the function being executed and the arguments of the function that called it. [function.] Arguments[n] Parameter function: option. The name of the Function object that is currently executing. N: Options. The 0-based parameter value index to pas

Javascript implements simple full-selection and inverse-selection functions, and javascript implements full-selection. This article provides examples to illustrate the code used in javascript to implement simple full-selection and reverse-selection

The implementation of this effect is key to the use of date objects and settimeout. A total of three examples, HTML structure as follows, do not add CSS style. Main experience of JavaScript implementation Window.onload=function () { var P1=document.getelementbyid ("P1"), P2=document.getelementbyid ("P2"); P3=document.getelementbyid ("P3"); Showtime1 (); Showtime2 ();

This article mainly introduces the solutions that javascript cannot use in trim functions under IE, and describes the solutions for javascript and jQuery respectively, it has good reference value for WEB Front-end javascript designers to conduct browser compatibility debugging. If you need it, you can refer to the

-order functionsIncreasingly complex, the need to introduce higher-order function abstractions is the occurrence of repetitive or similar code. We then revert to the previous function:var Moqi = function (p1) { this. Add = function (p2) { return function ( P3) { return', ' ' +p3; } }; return This . Add;};And then create a new function. var moqi = Function (p1) { this . Add = function (p2) { this . Add1 = function (p3) { return p1 +

This article mainly introduces the solutions that javascript cannot use in trim functions under IE, and describes the solutions for javascript and jQuery respectively, it has good reference value for WEB Front-end javascript designers to conduct browser compatibility debugging. If you need it, you can refer to the

Functions are the basis for modular programming, and for writing complex AJAX applications, you must have a deeper understanding of the functions.The functions in JavaScript are different from those of other languages, and each function is maintained and run as an object. By the nature of the function object, it is convenient to assign a function to a variable or

and after the space is reversed order.Because $ has a special meaning in the replacement text, we need to write $$ if we want to use the $ character, for example:var reg = /(\w+) \s (\w+)/;var str = ' Cainiao Gaoshou '; var newstr = str.replace (Reg, ' $$ $$ ');d ocument.write ( NEWSTR);The result is: $ $.2.3. Search () method and 2.4. Split () methodSimilarly, the search method of the string and the split method can also use regular expressions in the following form:Str.search (REG);Search