Attributes and usage of string, function, and array

/* Array */
Array. Reverse () // sorts the array in reverse order and changes it to a new array.
Array. Sort () // sorts the array by characters and changes it to a new array.
S = array. Push ("str1", "str2") // Add an array from the back. S is the Add record.
S = array. Pop () // Delete the array from the back, and s is the deleted record
S = array. Shift () // Delete the array from the front, and s is the deleted record
S = array. unshift ("str1", "str2") // Add an array from the front. S is the Add record.
S = array. splice (, "AA", "BB") // Delete two arrays from behind the third array, and add a new array at this position. S: Add record
S = array. Slice (2, 4) // starts from the second end of the array and obtains the fourth value. The array itself has not changed.
S = ar1.concat (AR2) // Add array AR2 to array AR1 to generate a new array S.
S = array. Join ("#") // concatenate array elements with # To form a string and return it to S.

/* Function */
Sample: function test (arg1, arg2)
Use: Test ("DDD", "Sss", "fff ")
// Test. Arity: // number of parameters set by the function (return value ).
Test. Length: // number of parameters set by the function (return value ).
Test. Caller: // call the test () function (returned function, supported by IE ).
Test. Apply (OBJ, [arg1, arg2]) // make the specified object (OBJ) have the attributes and methods of test.
Test. Call (OBJ, arg1, arg2) // make the specified object (OBJ) have the attributes and methods of test.
Arguments: // The number of actually passed parameters (returned array ).
Arguments. callee: // The currently executed function (return function ).
(New test). constructor: // view the structure (return function) of the new instance (test ).

/* String */
Str. Slice (3,-5) // start from the end of the third string and obtain the-5 (the fifth to the last. Parameter 2 must be greater than parameter 1 or be negative ).
Str. substring (6th) // starts from the end of the third string and obtains values.
Str. substr () // starts after the third string and takes 6 Characters backward.
Str. charcodeat (4) // returns the 10-digit encoding of the 5th strings.
Str. charat (4) // returns 5th strings.
Str. tolowercase () // convert all to lowercase characters.
Str. touppercase () // All are converted to uppercase/lowercase characters.
Str. Split (",") // use "," to split the string and return an array.
Str. Search ("AAA") // finds the position of AAA in the string, which is generally used together with a regular expression.
Str. indexof ("AAA") // locate the position of AAA in the string.
Str. lastindexof ("AAA") // search for the position where "AAA" appears in the string.
Str. Match ("AAA") // extracts "AAA" from STR, returns NULL or an array, which is generally used together with a regular expression.
Str. Replace ("AAA", "BBB") // Replace the first "AAA" with "BBB", which is generally used together with a regular expression.
String. fromcharcode (39080) // returns a 10-digit encoded character.
Str1 = str2.concat (str3) // Add str3 to str2 to generate a new string str1.

(From 51js rimifon (unknown ))