Straighten out JavaScript (11)-array

Array direct quantity

 
VaR arr; arr = ['A', 'bb', 'cc']; alert (ARR. tolocalestring (); // AA, BB, ccarr = [11, 22, 33]; alert (ARR. tolocalestring (); // 11.00, 22.00, 33.00/* the array element can be of any type, including the array itself */ARR = ['A', 'bb ', 123]; alert (ARR. tolocalestring (); // AA, BB, 123.00 alert (ARR [0]); // aaalert (ARR [1]); // bbalert (ARR [2]); // 123/* The dimension can be set first, and then assigned a value */ARR = [,]; arr [0] = 11; arr [1] = 22; arr [2] = 33; alert (ARR. tolocalestring (); // 11.00, 22.00, 33.00/* First give an empty array, and then specify the Dimension */ARR = []; alert (ARR. length); // 0arr. length = 3; arr [0] = 11; arr [1] = 22; arr [2] = 33; alert (ARR. tolocalestring (); // 11.00, 22.00, 33.00/* The available Length attribute changes the array size */ARR = [,]; arr. length = 2; alert (ARR. tolocalestring (); // 1.00, 2.00

  
 

Create three types of array objectsCubeMethod

VaR arr; arr = new array (11, '22', true); alert (ARR. tolocalestring (); // 11.00, 22, truearr = new array (3); arr [0] = 11; arr [1] = '22 '; arr [2] = true; alert (ARR. tolocalestring (); // 11.00, 22, truearr = new array (); arr. length = 3; arr [0] = 11; arr [1] = '22'; arr [2] = true; alert (ARR. tolocalestring (); // 11.00, 22, true

  
 

Join: Array to string

 
VaR arr, STR; arr = new array ('A', 'B', 1, 2, 3); STR = arr. join (); alert (STR); // A, B, 1, 2, 3/* can specify the separator */STR = arr. join ('*'); alert (STR); // a * B * 1*2*3

  
 

Reverse, sort: Inversion and sorting

 
VaR arr; arr = new array ('C', 'D', 'E', 'A', 'B'); arr. reverse (); alert (ARR. tolocalestring (); // B, A, E, D, Carr. sort (); alert (ARR. tolocalestring (); // A, B, C, D, E

  
 

Concat: Add and return a new array

VaR arr; arr = [1, 2, 3] arr = arr. concat (4, 5); alert (ARR. join (); // 1, 2, 3, 4, 5

  
 

Push, pop: Add and delete elements from the end, return new length by push, and return deleted elements by pop.

 
VaR arr; arr = [1, 2, 3, 4, 5] arr. pop (); alert (ARR. join (); // 1, 2, 3, 4arr. push (7, 8, 9); alert (ARR. join (); // 1, 2, 3, 4, 7, 8, 9arr. push (0, ['A', 'B']); alert (ARR. join (); // 1, 2, 3, 4, 7, 8, 9, 0, A, Barr. pop (); alert (ARR. join (); // 1, 2, 3, 4, 7, 8, 9, 0arr. pop (); alert (ARR. join (); // 1, 2, 3, 4, 7, 8, 9

  
 

Unshift, shift: Insert and delete from the beginning; unshift returns the new length; shift returns the deleted Element

 
VaR arr; arr = [1, 2, 3] arr. unshift (5, 6); alert (ARR. join (); // 5, 6, 1, 2, 3arr. shift (); arr. shift (); alert (ARR. join (); // 1, 2, 3arr. unshift ([5, 6, 7, 8]); alert (ARR. join (); // 5, 6, 7, 8, 1, 2, 3arr. shift (); alert (ARR. join (); // 1, 2, 3

  
 

Splice: Delete, replace, and insert. If yes, the array of the deleted element is returned.

VaR arr; arr = [1, 2, 3, 4, 5, 6, 7, 8] arr. splice (4, 3); // delete three alert (ARR. join (); // 1, 2, 3, 4, 8arr. splice (3, 3, 'A', 'B', 'C'); // replace three alert (ARR. join (); // 1, 2, 3, a, B, Carr. splice (3, 0, 7, 8, 9); // insert 3 Records starting from 3rd (0); insert the second value to 0 alert (ARR. join (); // 1, 2, 3, 7, 8, 9, a, B, c

  
 

Slice: Extract sub-array; return new array

 
VaR arr; arr = [1, 2, 3, 4, 5, 6, 7, 8] arr = arr. slice (2, 5); alert (ARR. join (); // 3, 4, 5/* indicates the number of backend columns */ARR = [1, 2, 3, 4, 5, 6, 7, 8] arr = arr. slice (2,-2); alert (ARR. join (); // 3, 4, 5, 6arr = [1, 2, 3, 4, 5, 6, 7, 8] arr = arr. slice (-3,-1); alert (ARR. join (); // 6, 7

  
 

Tostring, valueof

VaR arr; arr = [1, 2, 3, 'A', 'B', 'C'] Alert (ARR); // 1, 2, 3, A, B, calert (ARR. tostring (); // 1, 2, 3, a, B, calert (ARR. valueof (); // 1, 2, 3, a, B, calert (ARR. tolocalestring (); // 1.00, 2.00, 3.00, a, B, c

  
 

Multi-dimensional array traversal and Simulation

 
VaR arr; arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]; alert (ARR [1] [1]); // 5arr = new array (1, 2, 3), new array (4, 5, 6), new array (7, 8, 9 )); alert (ARR [1] [1]); // 5 alert (ARR) // 1, 2, 4, 5, 6, 7, 8, 9for (I = 0; I <arr. length; I ++) {document. write (ARR [I] + '<B>'); //, 3/, 6/, 9} arr =, 9]; for (I in ARR) {document. write (ARR [I] + '<br>'); // 1/2/3/4/5/6/7/8/9} arr = new array ([, 3], [, 5, 6], [7, 8, 9]); For (I in ARR) {document. write (ARR [I] + '<br>'); //, 3/, 6/, 9} for (I in ARR) for (J in arr [I]) document. write (ARR [I] [J] + '<br>'); // 1/2/3/4/5/6/7/8/9