[Study Notes] JavaScript coding specification-type, Study Notes javascript

[Study Notes] JavaScript coding specification-type, Study Notes javascript

• Type

Basic Type: when accessing the basic type, the type value should be operated directly.

String number boolean null undefined

Var a = 0; var B = a; B = 8; console. log (a, B); // 0, 8

Note:

1. Call the console in JavaScript to write logs.

2. Open the IE developer tool before you can use the console. By default, an error occurs when you access the console object of IE.

Composite Type: when accessing composite type, you should operate its reference

Object array function

Var a = [1, 2]; var B = a; B [0] = 9console. log (a [0], B [0]); // 9