javascript complete reference

This article mainly introduces the grouping matching and reverse reference of JavaScript Regular Expressions. For more information, see Syntax Metacharacters (pattern): used for group matching repeatedly Attribute $1 ~ $9 if it exists, it is used to obtain the matched substring in the corresponding group. \ 1 or $1 is used to match the content in the first group. \ 2 or $2 is used to match the content in t

The ECMAScript variable may contain values for two different data types: the base type value and the reference type value.Primitive type values refer to simple data segments that are stored in the stack's memory, meaning that this value is completely stored in a single location in memory.The reference type value refers to the object that is stored in the heap memory, meaning that the variable is actually a

the entire pattern. The remainder is the capturing group string that matches the string for the entire pattern (if not, there is only one item) PS: for exec () and test (), if the regular expression has G mode, the next time the expression is called again, the match is started from the last match, and if the G mode is not used, Call the regular expression again and match from the beginning.inherited methods: (Tolocalstring (), toString (), ValueOf ())The first two returns the literal of the reg

[Javascript advanced programming] excerpt 2 Chapter 5 reference type, Chapter 5 javascriptChapter 5 reference types 1. There are two ways to create an Object: The first is to use the new operator: varperson = new Object (); The second method is to use the literal representation of the object: var person = {name: 'test'}; (note that the last attribute is not follo

Summary of common operation methods for various reference types in JavaScript, and summary of javascript Object Type Array typeRe-sorting method: compareAscending Order: function compare(value1, value2){ if (value1 Descending order: function compare(value1, value2){ if (value1 Slice:Slice (start, end); slice () method returns all items starting from the specifi

This article mainly introduces the reference and transfer of JavaScript Object parameters. If you are interested, you can refer to a problem encountered today and how to change the parameters to the external function, such: 《script》 var myname = "wood"; A(myname); document.write(myname); function A(n) { n = "Yao"; }《script》 The output result is still wood, indicating that after myname is passed i

----------If this value is Boolean ' String '----------if this value is string strings ' Number '----------if this value is a numeric type # "Object"----------if this value is an object or null "Function"----------if this value is a function But strictly speaking, a function is an object in ECMAScript, and each function is an instance of this class of functions, and since the function is an object, then it is a reference type, so a function is on

this tool is called extrusion (crunching), and simply deletes all comments and line breaks. The documentation for this tool is said to save 20%~50% bandwidth. Using the crunch mode, you can see that the size of the JavaScript file is reduced by 30%. The highest level of compression in this tool is called compression (compressing), is a real compression mechanism for the actual compression of JavaScript so

First, single selection 1. Which of the following statements will result in a run-time error: (a) A.var obj = ();//Syntax error B.var obj = [];//Create array C.var obj = {};//Create object D.var obj =//; Reason: var obj = new Array (); is right; JavaScript braces represent creating objects. var obj = {id:1, name: "Jacky"};alert (Obj.name); The example above indicates the creation of an object with a property ID (value of 1), property name (value is J

The complete implementation method of JavaScript + CSS infinitus classification effect, This article describes the complete implementation of JavaScript + CSS infinitus classification. We will share this with you for your reference. The details are as follows: CSS style: A {

ArticleDirectory 1. Embrace Javascript Ii. Value Type and reference type topic Iii. Javascript value types and reference types 4. How to understand the value type and reference type and Examples 1. Embrace Javascript