return nan

JavaScript Data type:There are 5 different types of data in JavaScript: String Number Boolean Object function 3 Types of objects: Object Date Array 2 data types that do not contain any values:

Conversion functions:JS provides two conversion functions for parseint () and parsefloat (). The former converts the value into an integer, which converts the value into a floating-point number. Only these methods are called on the string type, and

1,eval () functionThis function is to get the string of arguments, and it as a JS to deal with, so there may be someone use this to sabotage (such as injecting JS script files, etc.), so the best way is to use as little as possible, or you can use

ECMA: European Association of Computer ManufacturersISO/IEC: International standardization and International Electrotechnical CommissionDOM Level (10*) Document Object model1:dom core (Map-based XML document) and Dom HTML (based on the DOM core)2:

1. JavaScript data types　There are 6 data types in JavaScriptBoolean String number Undefined NullObjectThe object type contains an array (arrays) function (functions) and other general pairs.The number (Numbers) type can be an integer (intergers) or

Note: This article belongs to the personal summary, the knowledge point is not complete, the wrong place, also hope forgive me. (I will revise it in the future, correction)This book: the introduction of JS and the use of HTML in the skip. (Straight

1. Using "Use strict" on the top of the script or in the first line of the function will enable strict mode or execute in strict mode2. Define the variable that holds the object and initialize it to null3.null = = Underfined,is true;4.typeof Null,is

ToCharArray ToCharArray () converts this string to a new character array. Return: a newly assigned character array whose length is the length of this string, and the

Today saw a JS topic ["1","2","3"]. Map(parseint), the answer that emerges from the back of my mind is [all-in-one], but after seeing the right answer, I don't know why the answer would be [1,nan,nan ], read the explanation

There are three functions in JS that can convert non-numeric types to numeric types: number (), parseint (), parsefloat (). the first function, the transformation function number () , can be used for any data type, while the other two functions

JavaScript -- Date and Time Today, I will review JS and prepare for the next project: // JavaScript Document // The first part // creation Date object // var box = new Date (); // create a Date object // var box = new Date (Date. parse ('2014/1/12

JavaScript learning Notes: Data Types and javascript learning notes I. Classification Basic data types: undefined, null, string, Boolean, and number Complex data type: object Object Attributes are defined in the form of unordered names and value

Six Types of javascript data and special notes This article mainly introduces six types of javascript data and special notes. For more information, see Six common data types in js: String, Null, Number, Boolean, and Object.   1. Notes for

However, parseInt ("08", 10) can return 8.To clarify the differences between the two,See the difference between parseInt and Number written by others:ParseIntParses a string argument and returns an integer of the specified radix or base.Core

There are three main methodsConversion functions, forced type conversion, and weak type conversion using js variables.1. conversion functions:Js provides two conversion functions: parseInt () and parseFloat. The former converts the value to an

This is currently the world's shortest Javascript Method for Determining IE browsers from Russia! It has been tested in various versions of IE and other popular browsers. Although Microsoft has realized the Bug Based on IE, it has never been

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JavaScript basicsI. Features of JavaScript Browser scripting language, which can be mixed with HTML code Superior Cross-platform performance and can be written on Windows.linux Good security Good compatibility Two.

Today simply summed up some of the JS things, combing the whole system, each time the summary will have a different harvest;JS Summary Onefirst, "get the Element":1, through Id:var Obtn=document.getelementbyid (' btn1 ');var

JavaScript to deal with very numeric valuesNumber (): Any data type converted to numeric value;parseint (), parsefloat (): Converts a string into a numeric value;Conversion rules:Number ():1) If it is a Boolean value, True and false are converted to