JS Fourth Day Study summary

1, assignment value, reference pass value

2 various objects (built-in objects and custom objects)

3.string objects:

Property	Method
Stringobj.length Get length	Stringobj.charat (Index) Returns a character that specifies the subscript
&NBSP;	stringobj.indexof (substr) < Span style= "font-family: Arial" > find character string first present position
	Stringobj.lastindexof (SUBSTR) Find where the string last appears
	String.substr (Startindex[,length]) intercepts substrings from the original string
	Stringobject.substring (Startindex[,endindex]) intercepts substrings from the original string
	Stringobject.split (Sep) splits a string into an array
	Stringobject.localecompare (target) compares the order of two strings
	Stringobject.replace (the regular expression , the character to be replaced ) replaces one string with another character string

4.Array Objects

Property	Method
arrayobject.length < Span style= "FONT-SIZE:12PX; Color: #888888 "> Get the length of the array	arrayobject.shift () < Span style= "FONT-SIZE:12PX; Color: #888888 "> Delete the first element in the array and return it
	arrayobject.unshift ( element 1, element 2) add one or more array elements to the beginning of the array
	arrayobject.pop () Delete the last element of the array and return it to
	arrayobject.push () add one or more array elements to the end of the array and return the new length to
	arrayobject.join ([Sep]) merging an array into a string
	arrayobject.reverse () Flips the array
	Arrayobject.sort (SortBy) Sorting an array element

5. Date Object

method name	function
Dateobject.getfullyear ()	get 4
Dateobject.getmonth ()	get month The return value is Span style= "Font-family:calibri" >0 (January) to 11
Dateobject.getdate ()	get one day in one months The return value is Span style= An integer between "Font-family:calibri" >1 ~
Dateobject.gethours ()	return 0~23 hour
dateobject.  getminutes ()	return 0~59 minute
Dateobject.getseconds	Returns the number of seconds 0~59
dateobject.   getmilliseconds ()	return milliseconds  0~999
Dateobject.getday ()	return one day of the week   return value: 0~6
Dateobject.gettime ()	return timestamp   from 1970 year 1 month 1 # 0 0 sub 0 seconds start to present in milliseconds

Find where the string last appears

JS Fourth Day Study summary