what is best javascript book

BOM is the browser object model, DOM is the Document Object Model, the former is to operate on the browser itself, and the latter is to operate on the content in the browser (can be seen as a container. This article will introduce you to the difference between javascriptbom and dom. If you are interested, learn about i

BOM is the browser object model, DOM is the Document Object Model, the former is to operate on the browser itself, and the latter is to operate on the content in the browser (can be seen as a container. This article will introduce you to the difference between javascriptbom and dom. if you are interested, learn about i

to the engine, provided that the program is running in a non-strict mode.Next, if the RHS query finds a variable, but you try to make an unreasonable operation on the variable, such as trying to make a function call to a value of a non-function type, or referencing a property in a value of null or undefined type, the engine throws another type exception, It's called TypeError.Referenceerror is related to t

Now backbone, Emberjs, Spinejs, Batmanjs and other MVC frameworks have come to the attack. Commonjs, AMD, Nodejs, Requirejs, Seajs, Curljs and other modular JavaScript are coming. Web front-end has evolved into a large front-end, the Web front-end development faster. 1 Let's see what modularity is? Modularization is

I think the fundamental difference is that undefined is a JS language type, while undeclared is a JS syntax error.--------------------------------- Answer part 1 ---------------------------------------In JS, there are two undefined and null values for 'null', among which undefined is useful. Undefined

Original linkIn the JavaScript world, there are two words that are often mentioned, that is shim and polyfill, what are they referring to, and what is the difference? In this article, we will briefly give you a brief introduction of their relationship and differences.ShimA s

The String. fromCharCode (252) of javascript is different from the chr (252) of PHP. What should I do? Javascript String. fromCharCode (252) And PHP What should I do if the results of chr (252) are different? Reply content: JavascriptString. fromCharCode (252)And PHPW

Scopes are a set of rules that determine where and how to find variables, functions, and so on (identifiers). If the purpose of the lookup is to assign a value to a variable, the LHS query is used, and if the purpose is to get the value of the variable, the RHS query is used.The assignment operator causes the LHS query

Reply content:A problem to see the weak search function ... The problem is in the hidden section: The top three of the highest attention levels are: C,python,javascript. How do you see this phenomenon? I said, "PHP is the best language." A: Ordinary language may be a little artifice, PHP is artifice. I'm here to

What are the common errors of Javascript in IE ?? The object is missing! JavaScript php lacks objects Query0 = mssql_query ("select * from tb_xm where xm_pcid = '1 '"); $ Y = 1; While ($ myrow0 = mssql_fetch_array ($ query0 )){ ?> Function datawrite (){ If (xmlHttp. readyState = 4 | xmlHttp. readyState = 0 ){ XmlHttp

in JavaScript, the difference between "= =" and "= = =" is determined by the type of data: For basic data types such as String/number, there is a difference between different types of comparisons, and the "= =" is converted to the same data type and then compared, and if the data types on both sides of "= = ="

] () output is 6 How did it come true? has the Let saved ten states? this is because The JavaScript engine internally remembers the value of the last loop, and when it initializes the variable I of this round, it is calculated on the basis of the previous cycle. var a = [];for (var i = 0; i A[i] = function () {Consol

JavaScript is also an object-oriented language, but it is a prototype-prototype language, not a class-based language. In JavaScript, classes and objects don't look much different. What is prototype: function defines an object th

The VOID operator evaluates the given expression and returns directly to the undefined The void operator is usually used only to get The original value of the undefined, typically using void (0)(equivalent to void 0). In the above case, you can also use the global variable undefined instead (assuming it is still the default value). The result of this code

What is the difference between the trinocular operator and the If else in JavaScriptToday wrote a picture of a small demo of the carousel, used to judgeTry it first. If else, the code is as follows:if (n >= count-1) {n = 0;}else{n + +;}Then the code is finished, ready to optimize the code, the paragraph changed to the

Configuration is: php+apache+mysql+windows The second-level menu is the result of JS+CSS completion: The page shown on the phone below, the level two menu on the left is not open (JavaScript script is not loaded at all, because the mouse hover does not open the level two men

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 automatically parsed as global variables.script> function show(){ var a=5,b=6,c=7; } show(); alert(c);//弹出a、b、c全都报错script>This

Recently learning JavaScript, there is a very strange problem, first put out the code:functionBinarySearch () {vararr = [0,1,2,3]; varres = Actbinarysearch (0,3,2, arr); document.write ("res);}functionActbinarysearch (Left,right,val,arr) {if(Left >Right ) {document.write ("Do not find"); return-1; } varMidindex = Math.floor ((left+right)/2);varMidval =Arr[midindex]; if(Val midval) {Actbinarysearch (left,

compatibleAjaxobj = new XMLHttpRequest ();} else{Ajaxobj = new ActiveXObject ("Microsoft.XMLHTTP");}Ajaxobj.open ('post ', ' Http://www.***.com/data.json ', true);Get method, request URL data address, true for asynchronous request (default true,false is synchronous request)Ajaxobj.send (write the data to be sent here)//data to be sentAjaxobj.onreadystatechange = function () {if (ajaxobj.readystate ==4 ajaxobj.status = = 200) {Console.log (Ajaxobj.re

What does it mean when a decimal is added to a 16-bit floating-point number in a JavaScript timer? Take a look at this: var startNum = 1; setInterval(function () { startNum += 0.1; console.log(startNum); }, 500); Print it out like this:1.11.20000000000000021.30000000000000031.40000000000000041.50000000000000041.6000000000000005