JavaScript

One: Event flowThe event flow describes the order in which events are received from the page.Event bubbling DivID= "One"> DivID= "both"> DivID= "three">ClickDiv> Div> Div> document.getElementById ("one").

Definition and usageThe toLowerCase () method is used to convert a string to lowercase.GrammarStringobject.tolowercase ()return valueA new string in which all uppercase characters of stringobject are converted to lowercase characters.InstanceIn this

Factory mode is one of the most commonly used instantiation object patterns, and is a pattern that replaces the new operation with a factory method. In Factory mode, we create the object without exposing the creation logic to the client, and by

(function(global) {varid = 0, container = Document.head | | document.getElementsByTagName (' head ') [0]; functionJsonp (options) {if(!options | |!options.url)return; varScriptnode = document.createelement ("Script"), URL=Options.url, Data=

Array de-weight involves a lot of basic knowledge, summed up the following 6 methods: Double for loop, push new array; Double for loop, splice original array; Single for loop, traversing object properties; A single for loop,

First, the implementation of the environmentThe execution environment (also called the execution context, execution context) is one of the most important concepts in JavaScript. The execution environment defines which variables or functions have

What is a dithering function? We need to understand this concept before learning JavaScript to shake the function. Many people confuse the concept of shaking with throttling, but these two concepts are well understood.The Debounce function is a

1: Closures1. Concept: Closures are functions that can read other functions ' internal variables. In JS, only sub-functions inside the function can read local variables, so the closure can be understood as "a function defined inside a function".2.

1, the understanding of JSA, developed by Netscape (Netscape) b, which is a cross-platform scripting language C, applied to Web pages, to operate the browser and Web content D, JavaScript was originally designed to verify the correctness of HTML

1. Character SetThe JavaScript program is written in Unicode (two-byte notation) character set.2. Case-sensitive　　JavaScript is a case-sensitive language. HTML is case-insensitive, due to the fact that the two are closely related and differentiated.3

HTML DOM (Document Object model)When a Web page is loaded, the browser creates a Document object model for the page.The HTML DOM model is constructed as a tree of objects.HTML DOM TreeWith the programmable object model, JavaScript has the ability to

JS generally has two values of different data types:Basic types (including Undefined,null,boolean,string,number), passed by value;Reference types (including arrays, objects) are passed by address, and reference types are in-memory addresses when

script> function show(){ var a=b=c=d=5; } show(); alert(a);//弹a时报错（not defined），而b、c、d都能弹出5script>Because the assignment is a right-to-left combination:var a=b=c=d=5;Equivalent to var a=(b=(c=(d=5))); , where only A is declared, B,c and D are

Slot in Vue uses slots to distribute content, vueslot The subject of this article from: https://cn.vuejs.org/v2/guide/components.html#%E4%BD%BF%E7%94%A8%E6%8F%92%E6%A7%BD%E5%88%86%E5%8F%91%E5%86%85%E5% AE %B9 label is a placeholder. It helps you

Vue converts a timestamp to a custom time format. 1. First create a date. js file and write the following code: Export function formatDate (date, fmt) {if (/(y + )/. test (fmt) {fmt = fmt. replace (RegExp. $1, (date. getFullYear () + ''). substr (4

Vue2.0 custom pie chart (Echarts) component method, vue2.0echarts 1. Custom chart Components Echarts. vue 2. Page call Digoal. vue return 3, The above vue2.0 custom pie chart (Echarts) component method is to share with you

Perfectly solves the problem of incorrect select drop-down box options in iview. When using iview, I encountered such a problem by using the select drop-down box component in the Model. But when the pop-up box needs to scroll more than one screen,

Html ceiling effect, html ceilingI. HTML In HTML, you need to give the div an id Ii. CSS 3. JS1 and process-oriented 2. Object-oriented 1) Encapsulation Method /** Encapsulate the ceiling function, which must be implemented in combination with css. *

Use js to dynamically create tags and set attributes. When writing jsp pages, we often encounter this situation: the number of data retrieved from the backend is uncertain, so we are not sure how to design it when writing jsp pages on the front end.

JS changes page color source code sharing, js page color source code Let's take a look at the specific demonstration. The following is the complete HTML page code. You can test it. Document