What are the common methods of JavaScript built-in objects?

Commonly used methods of built-in objects: concat(), join(), pop(), shift(), slice(), splice(), push(), sort(), reverse(), toLocaleString( ), escape(), eval(), etc.

The operating environment of this tutorial: windows7 system, javascript version 1.8.5, Dell G3 computer.

Commonly used built-in objects in JS: Array object, Date object, string object, Global object

Commonly used methods in Array object:

• concat( )　Indicates merging several arrays into one array

• join()　　Set the separator to connect the array elements into a string

• pop() Remove the last element of the array

• shift() Remove the first element of the array

• slice(start, end) Return to the array A section of

• splice() can be used to delete, insert, or replace

• push() to the array Add a new element and return the latest length

• sort() Sort the array

• reverse() Reverse the order of the array

• toLocaleString() Convert the array to a local string

Commonly used methods of Global objects:

Global properties and functions can be used All built-in JavaScript objects

• escape() 　 Encoding string

• eval() 　　 Parse the string into JavaScript code and execute it

• isNaN()　　　　　　　　　　　　　　　　　

  ##parseFloat() 　 Parse a string and return a floating point number

• number() 　 Convert the value of the object to a number

• string()　　Convert the value of the object to a string
Common methods of String object

• 
  

  charAt()　　　　　 Return the specified index The character at the position

indexOf() 　　 　　 Search the string from front to back to see if it contains the specified string

• lastIndexOf()　　　Search the string before to see if it contains the specified string

• ##concat()　　　　Concatenate two or more strings

• match()　　　　Use The regular expression pattern performs a search on a string and returns the result containing the search result

• replace()　　　　Replaces a substring that matches the regular expression

• search()　　　　 Retrieve substrings in a string that match a regular expression. If no match is found, -1 is returned.

• slice(start, end) Intercept the substring according to the following table

• substring(start, end) Intercept the substring according to the following table

• ##split() Split the string into multiple substrings according to the specified delimiter and return the element group

• substr( start, length)　　Truncate the string according to its length

• toUpperCase()　　　　 Return a string in which all letters in the string are converted to uppercase letters.

• toLowerCase() Returns a string in which all letters are converted to lowercase letters.

• Methods of Math object

• ceil()　 Round up.

floor()　 Round down.

• round()  Rounding.

• random() Get a random number.

• Methods of Date object

• getDate function: Returns the "day" part of the date, with values ​​ranging from 1 to 31.

getDay function: Returns the day of the week, the value is 0~6, 0 means Sunday.

• getHours function: Returns the "hour" part of the date, the value is 0~23.

• getMinutes function: Returns the "minutes" part of the date, the value is 0~59.

• getMonth function: Returns the "month" part of the date, with values ​​ranging from 0 to 11.

• getSeconds function: Returns the "seconds" part of the date, the value is 0~59.

• getTime function: Returns the system time.

• getTimezoneOffset function: Returns the time difference in this area (the regional time difference between local time and GMT Greenwich Mean Time), in minutes.

• getYear function: Returns the "year" part of the date. The return value is based on 1900, for example, 1999 is 99.

• parse function: Returns the number of milliseconds since 0:00 on January 1, 1970 (local time)

• setDate function: Set date The "day" part has a value of 0 to 31.

• setHours function: Set the "hour" part of the date, the value is 0~23.

• setMinutes function: Set the "minutes" part of the date, the value is 0~59.

• setMonth function: Set the "month" part of the date, the value is 0~11. Among them, 0 represents January, ..., and 11 represents December.

• setSeconds function: Set the "seconds" part of the date, the value is 0~59.

• setTime function: Set time. The time value is the number of milliseconds since 00:00 on January 1, 1970.

• setYear function: Set the "year" part of the date.

• toGMTString function: Convert the date into a string, which is GMT Greenwich Mean Time.

• setLocaleString function: Convert the date into a string, which is the local time.

• ##UTC function: Returns the number of milliseconds (GMT) since 0:00 on January 1, 1970.

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