Mutual conversion between JavaScript Array and string

The array class can be defined as follows:

VaR avalues = new array ();

If you know the length of the array in advance, you can use the parameter to pass the length

VaR avalues = new array (20 );

------------------ The following two definitions are the same -------- 1 -----------

VaR acolors = new array ();

Acolors [0] = "red ";

Acolors [1] = "green ";

Acolors [2] = "blue ";

Alert (acolors [0]); // output "red"

------------------------------------------------- 2 -----------

VaR acolors = new array ("red", "green", "blue"); // It is equivalent to array-defined arrays.

Alert (acolors [0]); // output "red" too

--------------------------

(1) convert array to string

The output of the above two array definitions is the same, and a comma separator is found in the middle.

Alert (acolors. tostring (); // output "red, green, blue ";

(2) convert string to array

We found that the array is converted to a string, with one separator ',' added between the arrays. Therefore, the string to be converted to an array must have a separator. It can be a comma or another separator.

VaR scolors = "red, green, blue ";

VaR acolors = scolors. Split (','); // the string is converted to an array.