Interesting JavaScript Array definition method _ basics

Copy Code code as follows:

var person = new Array ();
PERSON[0] = 120;//defines a person's weight of 120 kg
PERSON[1] = 21;//Defines the age of the person 21 years old
document.write ("body weight =" +person[0]+ "age =" +person[1])/output weight and age of person

Another interesting way to define arrays:

Copy Code code as follows:

var person = new Array ();
person["weight"] = 50;
Person["age"] = 40;
document.write ("body weight =" +person["Weight"]+ "age =" +person["ages"));

The above method, called an associative array, is indexed by a specific value. In fact, numeric arrays can be treated as a special case of associative arrays.

Using associative arrays instead of numeric arrays means that we can refer to them by the names of the elements rather than by a subscript number, which greatly improves the readability of the script.