JS advanced programming before three chapters

Source: Internet
Author: User

1. Simple to accept JS history

2. Introduction JS use and head defer type async async and so on

3.js Basic Syntax

1.typeof is an operator is not a function, there are five basic types Undefined Null Boolean String number a complex type Object

2. undefied NULL

3. True false, all values in JS can be converted to these two values

4. String non-empty strings (' ') number 0 or Nan object except null, underfied

5.NaN non-numeric is any number divided by 0, IsNaN () function

6.number () parseint parsefloat

7. toString (), null and undefined without this function string function

8. Object has constructor hasownproperty ispropertyof toString valueOf propertyisnumberable

4. Operators

5. The properties of the for in iteration object have no order

6. Label Continue break

7. Functions

JS advanced programming before three chapters

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