JS Reference type Learning

Source: Internet
Author: User

Today is the first day to write a blog!

It's so hard to understand what kind of feeling it is. Tt,c++ and Java are not the foundation.


1: Object is a value of reference type

2.Object type (base type)

Methods of accessing properties: Person.name;

person["name"]//for property names with illegal characters

3.Array Type:

The A.length property is not just readable and can be used to add or remove items.  Eg:var Num=[red,blue,green];  color.length=2; Alert (color[2]);//undifined

B. Detecting array: instanceof array. or Array.isarray

The C.tostring method returns a comma-delimited string------------the Color.join ("|")//"Red|blue|green" default comma. ------------------valueof Returns an array

D.lifo and FIFO

Push (), pop (), shift () front end add unshift () front end delete;

Eg:var colors=new Array ();

var count=colors.unshift ("Red", "green");

Count=colors.unshift ("Black")//black,red,green

E. Reorder reverse () reverse order; sort () compares a string to accept a comparison function. The first parameter should return a negative number before the second, returning 0 as the same, or a positive number

function Compare (value1,value2) {

return value2-value1; Positive order


F. Operation Method Concat ()//stitching does not affect the original array

Slice () Eg:var colors=["Red", "green", "blue", "yellow", "purple"] Colors.slice (1,4)//green,blue,yellow Baotou not wrapped tail

Splice () Eg:var colors=["Red", "green", "Blue"] colors.splice ("Red", "purple")//red red purple;

G. Location method: IndexOf lastIndexOf not found return-1, will use = = =;

H. Iterative methods, the values of the array are not modified every filter ForEach map some

I. Attribution method: Reduce reduceright//start with the last item

eg var values[1,2,3,4,5]; var sum=values.reduce (function{(Prew,cur,index,array)

Return prew+cur})//sum=15;

4.Date type

5.RegExp type g: Global----------I: Ignore case mode--------------m multiline mode (\ escaped)



JS Reference type Learning

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