JavaScript

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Method Name: Gotop ()Function Description: Click on an element, call Method Gotop (), fixed interval, scroll to the top of the screenDate: 2016.06.06 16:02Author: [Email protected]JavaScript Interrupt function Usage setinterval ()--back to top

Issue 1: Scope(function() { var a = b = 5;}) (); Console.log (b); // non-strict status display 5// A is a local variable, B is a global variable // Strict state display B is not defined( function () { ' use strict '; var a = window.b = 5

Program Ideas:1. Create an Interrupt Objectvar IR = setinterval (MyMethod (), 1000);1000 means 1s interval, 1ms per unit2. Create callback functionint i = 1;function MyMethod () {i++;}3, in order to let each 1s output call once mymethod (), and then

Bubble sort: The elements in an array are arranged in order from large to small or from small to large.var array=[9,8,7,6,5,4,3,2,1];First round comparison: 8,7,6,5,4,3,2,1,9 exchanged 8 times i=0 j=array.length-1-iSecond round comparison: 7,6,5,4,3,

1.void operatorECMAScript 262 Specification, the void description is as follows:The void OperatorThe production unaryexpression : void unaryexpression is evaluated as follows: Let expr is the result of evaluating unaryexpression. Call

JavaScript code always seems to be more chaotic than Java, C #, and probably not familiar with JavaScript programming, so a good JavaScript debugger is especially important. At present, most of the internet and books have seen:First: Microsoft

This is bound at run time, not at write time, and its context depends on the various conditions of the function call. This does neither point to itself nor to the lexical scope of the function. This is the binding that occurs when a function is

1, the two most basic ways to create objects: constructors | | Literal quantityconstructor function:var New = "Chen1zee1"= 18;Literal:var person = {name: "Chen1zee1", Age:18,} Cons: When you create many objects using, constructors, and

1 /**2 * Created by 2016/6/4.3 */4 functionBox () {5 varobj =Newobj ();6Obj.name = "Lee";7Obj.run =function(){8 return This. name+ "Run";9 };Ten returnobj; One } A varB =Box (); - //The Factory mode creation object creates obj

Using typeof in JavaScript to judge data types, you can only distinguish between the basic types, "number", "string", "Undefined", "Boolean", "Object" five.For arrays, functions, and objects, their relationships are complex, and using typeof will

As you may know, the execution environment of the JavaScript language is "single thread".The so-called "single thread" means that only one task can be completed at a time. If you have multiple tasks, you must queue, complete the previous task,

Defined:The way to define a string is to assign a value directly, for example: Var mystr= "Javascript is good!"; To access the properties of a string: Length Property Eg:var myl=mystr.length;//The myl length is 19 (spaces,

Frontend Optimization-server-reduces Http and server-side requests On the page, all images except content images are modified. Removing meaningless modifiers or replacing the show with css is an effective way to reduce the number of HTTP requests.

Clear float impact and clear floating float impact Floating will cause the parent element to collapse: Solution: Parent element overflow: hidden, Insert the child element clear at the end, Why does parent element overflow: Den den solve

CSS clear floating, cssclear clear floating 1. clear in CSS has four parameters: None: both sides are allowed to float. Left: float on the left is not allowed. Right: float on the right is not allowed. Both (default); float is not allowed. 2. clear

Bootstrap source code analysis-scrollspy (rolling listening) and bootstrapscrollspySource code file: Scrollspy. js implementation function 1. When the hashkey set in the rolling area is from the vertex to the valid position, it is associated with

The jsp page is automatically displayed as "Miscellaneous (Quirks)" In IE8 text mode, leading to incorrect display. ie8quirks Recently, when modifying the responsive page of a website, the modification process is pasted and copied, causing some

Summary of daily css skills (2) -- confusion caused by inline-block, cssinline-block I,Problem description In normal la S, the frequency of inline-block usage is very high, mainly because you can set the width and height of Row labels. I found two

JavaScript jQuery events, animations, extensions, javascriptjqueryEvent Because JavaScript runs in a single thread mode in the browser, after the page is loaded, once all the JavaScript code on the page is executed, it can only rely on the trigger