Summary of commonly used methods in javascript
concat() connects elements to the array
join() converts all elements of the array into strings and connects them together
splice() inserts, deletes, and replaces array elements
push() adds elements to the end of the array
pop() removes the last element of the array
shift() removes the first element of the array
unshift() inserts an element at the head of the array
slice() returns a part of the array
every() tests whether the assertion function is true for each array element
some() tests whether at least one array element can make the assertion function true
foreach() specifies a function for each element of the array
filter() returns an array that satisfies the assertion function Element
indexOf() finds matching elements in the array
lastIndexOf() searches in reverse in the array
map() calculates new elements from the elements of the array Array elements
reduce() calculates a value from the elements of the array from left to right
reduceRight() reduces the array from right to left and calculates a value
sort() sorts the array elements in the original array
reverse() reverses the order of the array elements in the original array
toLocaleString() converts the array into a localized string
toString() converts the array into a string
split() splits the string into array elements
var date = new Date() constructor
Date .now() returns the current time, the number of milliseconds since the beginning of the epoch
Date.parse() parses a string representation of a date and time, and returns the internal millisecond representation of the date
get [UTC]Date() returns the day value of the month of the Date object, local or world time
get[UTC]Day() returns the day value of the week of the Date object, local or world time
get[UTC]FullYear() returns the year of the date, in complete 4-digit format, local or world time
get[UTC]Hours() returns the hour value of the Date object, local or world Time
get[UTC]Milliseconds() returns the millisecond value of the Date object, local or world time
get[UTC]Minutes() returns the minute value of the Date object, local or world time
get[UTC]Month() returns the month value of the Date object, local or world time
get[UTC]Seconds() returns the seconds value of the Date object, local or world time
getTime() returns the internal millisecond representation of the Date object. Note that this value has nothing to do with the time zone. Therefore, there is no separate getUTCTime method
getTimezoneOffset() returns the current date between the local representation and the UTC representation. The difference in minutes. Note that the return value depends on whether daylight saving time on the specified date is valid
getFullYear() returns the year value of a Date object
getMonth() returns the month value of a Date object
getDate() returns the day value of the month of a Date object
getDay() returns the day value of the week of a Date object
getHours() returns the hour value of a Date object
getMinutes() returns the minutes value of a Date object
getSeconds() returns the millisecond value of a Date object
getTime() returns a Date object in millisecond form
getMilliseconds() returns the millisecond value of a Date object
toJSON() serializes a Date object to JSON and uses toISOTring()
decodeURI() to decode the characters in a URI
decodeURIComponent() decodes characters in a URI component
encodeURI() escapes characters in a URI
encodeURIComponent() escapes characters in a URI component
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