JavaScript prototypes and built-in objects 1

Prototype definition

• Each object has a prototype
• The prototype is still an object
• Simulating the implementation of object-oriented inheritance

Prototype chain

• The prototype of the object is also a prototype
• Objects can inherit properties on the prototype in addition to their own properties

Get prototypes

• Object. Proto
• constructor. prototype

Properties of the manipulation prototype

• The prototype itself is the object, the same object as the operand

Determines whether a property is self-contained or a prototype inherits

• hasOwnProperty ()

Create an object in ECMA5 and specify the object's prototype

• Object.create ();

Boolean Creation method

• Direct amount Var b=true;
• Conversion function Var B1=boolean (true);
• constructor var b2=new Boolean (False)

Property

• Constructor return Object type

Method

• ToString () turns the Boolean value to a string and returns the result
• ValueOf () returns the original value

Number Creation Method

• Direct volume
• Conversion functions
• constructor function

Property

• Number.MAX_VALUE
• Number.min_value

Method

• ToFixed () retains decimals for the specified number of digits, reserved integers by default
• Toexponential () is expressed in the form of scientific notation.
• ToString () is converted to a string. You can convert decimal to any binary string

How string is created

• Direct volume
• Conversion functions
• constructor function

Property

• Length string Lengths

Method

• CharAt (index) returns the character at the specified position, which can be substituted with the [] operator
• charCodeAt (Index) returns the encoding of the character at the specified position
• String.fromCharCode () converts Unicode encoding to characters
• Concat () joins one or more strings, which can be replaced by the + operator
• IndexOf () returns the position of the first occurrence of a character (string) in a string
• LastIndexOf () returns the position of the last occurrence of a character (string) in a string
• SUBSTR (start [, length]) intercepts the string
• SUBSTRING (start [, end]) intercepts the string
• Slice () with substring
• Split () splits a string into an array of root arrays in the same way Arr.join () opposite
• toUpperCase () Converts a string to uppercase
• toLowerCase () Converts a string to lowercase
• Trim () Remove spaces on both sides of the string
• Replace ()
• Match ()
• Search ()

Date Creation Date

• constructor var date=new date ()

Method

• GetYear ()
• getFullYear () A.D.
• GetMonth () starting from 0
• GetDay () Day (days of the week)
• GetDate () Day (date)
• GetHours ()
• Getminutes ()
• Getseconds ()
• Getmilliseconds () MS
• GetTime () from January 1, 1970 0:0 0 seconds to present the number of milliseconds
• getTimezoneOffset () The offset unit of the standard Time zone is the minute
• getUTCHours () Standard Time zone
• Getutc .....
• setUTCHours ()
• Set ...
• SETUTC ...
• TOUTCSTIRNG ()

Time stamp

• Number of seconds or milliseconds since the beginning of Unix
• Unix 1970

Math Property

• Pi π

Method

• ABS () to find absolute value
• sqrt () to find the square root
• Pow () to ask several Parties
• Max () to find the maximum value
• Min () to find the minimum value
• Round () rounded rounding
• Floor () Rounding and rounding
• Ceil () into a rounding
• Random () returns the decimal number between 0~1

JavaScript prototypes and built-in objects 1