Statement and create an array of JavaScript--

We know that Object is using the new keyword or literal notation declared and created.

So the type of application can also be declared with --Array created in a similar way.

A, new keyword to create an array: new Array ();

var colors = new Array();
console.log(colors);
console.log(colors.length);
colors[0] = '1';
colors[1] = 2;
console.log(colors);

Second, the length of the display declares the array, such as new Array (10);

var colors2 = new Array(20);
console.log(colors2);
console.log(colors2.length);
colors2[20] = '2';
the console.log (colors2); // before blank 20 is twenty-one 2 
the console.log (colors2 [20 is]); // twenty-one 2 
the console.log (colors2.length); // The total length is 21

Third, Array () method was added directly to the initial value, such as new Array (1,2,3);

var colors3 = new Array(1, '2', 3.0);
console.log(colors3);
console.log(colors3.length);
colors3[3] = colors2;
console.log(colors3);
console.log(colors3.length);

Note: Representation II and III require separate areas, when we use the brackets Array () is only one in number, it indicates that the second method, the array length digital representation; when new Array () is placed 3 ' 'string, said three methods, the initial length of the array 1.

var CC = new new the Array (3); // declare an initial array of length 3 
var dd = new new the Array ( '3'); // declare an array of a first length and a value of 3 
console .log (cc);
console.log(dd);

Fourth, the proof can have omit the new keyword Array, Array (), Array (3), Array ( '3') are legal

Five, Array also has a literal representation

var colors4 = [ 'Red', 2, 4.0]; // create an array of length 3 of 
the console.log (colors4);
 var colors5 = []; // array of length 0 
colors5 [0] = '1' ; // Add a 
colors5 [0] =. 3; // modify first 
the console.log (colors5); // [. 3] 
the console.log (colors5.length);