JS Object 1 String Object 2 time Date object 3 numeric object

1 string objects directly to character manipulation

var str = "This, yes, no, yes, word, character, string";
String to array string. Split (delimiter)
var arr = Str.split (",");//parameter is delimiter
Console.log (arr); ["This", "yes", "word", "symbol", "string"]
Array to string array. Join (String connector)
var str1 = Arr.join ("-");
Console.log (STR1); This-yes-word-character-string

Determines whether a string contains a returned subscript that contains no return-1
var i = str.indexof ("i");
Returns the last occurrence of the subscript
var i = str.lastindexof ("yes")

var str = "HELLO word";
String to uppercase lowercase
Alert (Str.touppercase ());
Alert (Str.tolowercase ());

Intercepts string strings. substr (from where to start, intercept a few)
Alert (STR.SUBSTR (0,5));

Use an example to determine if a number is a palindrome number

Thinking Var a=1234,

var a=a+ "";

1 numbers to the array b=a.split (",");

2 inverse array c=b.reverse ();

3 array to string var a1=c.join ("")

42 Strings Compared if (a = = A1) {
Alert ("palindrome number")
}
2 Time Date Object new Date ()

var mydate = new Date ();
Mydate.getyear (); Get Current year (2-bit)
Mydate.getfullyear (); Get the full year (4-bit, 1970-????)
Mydate.getmonth (); Get the current month (0-11, 0 for January)
Mydate.getdate (); Get current day (1-31)
Mydate.getday (); Get Current week x (0-6, 0 for Sunday)
Mydate.gettime (); Gets the current time (the number of milliseconds since 1970.1.1)
Mydate.gethours (); Get current number of hours (0-23)
Mydate.getminutes (); Gets the current number of minutes (0-59)
Mydate.getseconds (); Gets the current number of seconds (0-59)
Mydate.getmilliseconds (); Gets the current number of milliseconds (0-999)
Mydate.tolocaledatestring (); Get Current date
var mytime=mydate.tolocaletimestring (); Get current time
Mydate.tolocalestring (); Get Date and time
3 Mathematical Objects Math.random ()

JS Object 1 String Object 2 time Date object 3 numeric object