Js_Array array object

The Array object in js is a dynamic Array and does not need to specify the size in advance. [Javascript] 1. varnamesnewArray (); 2. names [0] & quot; tomy & quot; 3. names [1] & quot; jerry & quot; 4. names [2] & quot; lily & quot; 5.for( Array object in vari0; js is a dynamic Array and does not need to specify the size in advance.
[Javascript]
1. var names = new Array ();
2. names [0] = "tomy ";
3. names [1] = "jerry ";
4. names [2] = "lily ";
5. for (var I = 0; I 6. alert (names [I]);
7 .}
Write a function to calculate the maximum value of an array.
[Javascript]
1. // define a function
2. function getMax (arr ){
3. var max = arr [0]; // returns the first number in the array to max.
4. for (var I = 0; i5. if (arr [I]> max) {// if the current value is greater than max
6. max = arr [I]; // then, max is the current value.
7 .}
8 .}
9. return max; // return the value of max.
10 .}
11. // define an array
12. var num = new Array ();
13. num [0] = 3;
14. num [1] = 1;
15. num [2] = 5;
16. num [3] = 2;
17. // calculate the maximum value
18. alert (getMax (num ));
 
Reverse the order of the elements of a string array, thought: swap the I and the length-i-1 (js has a reverse function reverse, but here we write one by ourselves)
[Javascript]
1. // borrow the num Array
2. // output the original
3. document. write (num );
4. // define the function www.2cto.com
5. function myreverse (arr ){
6. for (var I = 0; i7. var temp = arr [I];
8. arr [I] = arr [arr. length-i-1];
9. arr [arr. length-i-1] = temp;
10 .}
11 .}
12. // Process
13. myreverse (num );
14. // output after processing
15. document. write (num );
 
Output A String Array as a | split string. (Js has a join function. num. join ("|") concatenates an array with a separator into a string, which we can write here .)
[Javascript]
1. // define a function
2. function myjoin (arr ){
3. if (arr. length <= 0 ){
4. return "";
5 .}
6. var s = arr [0];
7. for (var I = 1; i8. s = s + "|" + arr [I];
9 .}
10. return s;
11 .}
12. // define an array
13. var name = new Array ();
14. name [0] = "tomy ";
15. name [1] = "mary ";
16. name [2] = "peter ";
17. // call the Function
18. alert (myjoin (name ));
 
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