The Knowledge collation of JS Foundation

First, the Operation style:

. Style Action Inline style

. className Modify Class

Second, Operation Properties

1.. Simpler, manipulating existing properties

2. [] More flexible, point can do, square brackets can do. A string is placed in square brackets, the square brackets can be placed in a variable, and a point cannot.

Third, the way to get the elements

document.getElementById get an element by ID

Obj.getelementsbytagname get a set of elements by tag name

Obj.getelementsbyclassname gets an incompatible set of elements through class through class. Incompatible: ie6,7,8

Iv. detection data type: typeof data type: Number Numeric Boolean Boolean value string string undefined undefined object function

V. Get non-inline styles:

function GetStyle (obj,sname) {

Return Obj.currentstyle?obj.currentstyle[sname]:getcomputedstyle (Obj,false) [SName];

}

Six, get random number math.random () get 0-1 decimal between, including 0, never include 1

function rnd (n,m) {

Return parseint (N+math.random () * (m-n));

}

Seven, Timer:

The event is measured in milliseconds

SetInterval (fn,ms) Continuous execution

SetTimeout (FN,MS) executes once

* * First clear and then open.

Viii. Date Object

var odate = new Date (); Get

Odate.getfullyear () Get year

Odate.getmonth () Gets the month, to +1

Odate.getdate () Get Day

Odate.getday () Gets the week, Sunday is 0

Odate.gethours () when acquired

Odate.getminutes () Get points

Odate.getseconds () Get seconds

Odate.gettime (0 get timestamp timestamp: January 1, 1970 0:0:0:0 to the number of milliseconds now experienced

Set Odate.setfullyear (Y,M,D); Odate.setfullyear (Y,M); Odate.setfullyear (y);

Odate.setmonth (M,D); Month to-1 odate.setmonth (m);

Odate.setdate (d); Set Day

Odate.sethours (H,M,S,MS); Odate.sethours (h,m,s); Odate.sethours (H,M); Odate.sethours (h);

Odate.setminutes (M,S,MS); Odate.setminutes (m,s); Odate.setminutes (m);

Odate.setseconds (S,MS); Odate.setseconds (s);

Date objects will carry their own

The array of arguments argument parameters.

When the number of arguments is not fixed, use this thing.

Problems of the Ten and I

1. Add event in loop, use I in Event

FIX: Custom attribute enclosing space

2. Loop add timer, use I in timer

Solution: Closed Space

Xi. closed Space: Save a name. (function () {}) ();

The role of closed spaces: 1. Solve the problem of I. 2. Resolve the problem of variable name conflicts.

12. Eval to turn a string into an executable statement

Brackets are needed when evaljson.

var str = ' {a:1,b:2} ';

Eval (' (' +str+ ') ');

13, the JSON loaded things

No length subscript is name with for...in loop

14. Batch Set style

function SetStyle () {

if (arguments.length==2) {

for (var name in arguments[1]) {

Arguments[0].style[name]=arguments[1][name];

}

}else{

ARUGMENTS[0].STYLE[ARGUMENTS[1]]=ARGUMENTS[2];

}

}

The length of the array can be changed

Empty array: arr.length=0;

arr = [];

Arr.splice (0,arr.length);

while (arr.length) {arr.pop (); Arr.shift (); }

16. Get Browser Information: window.navigator.userAgent

The Knowledge collation of JS Foundation