Several methods for creating common js objects and js objects

Several methods for creating common js objects and js objects

1. Create an object literally

Var obj = {a: 1, B: 2 };

Note:An object literal is an expression that creates and initializes a new object and calculates each attribute value of the new object. Therefore, if the object literal volume is used in the loop body, a new object will be created every cycle.

2. Create an object using the new operator

Var obj = new Object (); // create an empty Object var ary = new Array (); // create an empty Array Object

Note:The new operator is followed by a function call, which is called a constructor. The original type in js contains built-in constructor, and you can also define the constructor yourself.

3. Create an object by executing the function immediately

Var obj = (function () {return {x: 1, y: 2 };}());

Note:You must have a return statement inside the function to be executed immediately. The returned content is the object to be created.

4. create an Object through Object. create ()

Var obj = Object. create ({x: 1, y: 2 });

Note:Object. create () is a static function. After passing in the prototype Object, you can create an Object that inherits the prototype Object. For example, in the preceding example, the obj Object inherits the x and y attributes.

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