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VariablePerson=null; Empty variablesCarname= "Volvo"; Assign to an undeclared variable, it will become a global variable, even inside the functionWindow.carnam; All data variables belong to the Window objectCharacter accessing a string: Using the location indexvar carname = ' Volvo XC60 ';var character = carname[7];var y = new String ("John"); Do not use this method to declare variablesData typetypeof [1,2,

FunctionThere is a certain function of the code body of the collection, the basic structure:function functionname () {Execute code}Base function, invocation:function Hanshu () {alert " this is the first function "}Hanshu (); function callCategory: Functions with Parameters:function Hanshu (a) {alert A}//A is a formal parameter, formal argument.Hanshu (b)//b is an argument, the actual parameter. function Hanshu sum (A, B) {alert (a+b)} sum (2,3)//parameters are assigned when called,function with

$age =array ("Peter" and "a", "Ben" = "Notoginseng", "Joe" and "43");$age =array ("Bill" = "+", "Steve" = "Notoginseng", "Peter" and "43");foreach ($age as $x = + $x _value) {echo "key=". $x. ", value=." $x _value;echo "}? >[variables to be defined outside the string?]-Object properties and objects---object methods commonly used for objectsPHP functionsThe real power of PHP comes from its function: it has more than 1000 built-in functions.To return a value to a function, use the return statement

Numbers can be numbers or objectsNumbers can be initialized with private data, just like x = 123;JavaScript numeric object initialization data, var y = new number (123);Instance var x = 123; var y = new number (123); typeof (X)//returns number typeof (Y)//returns Object Instance var x = 123; var y = new number (123); (x = = y)/is false because x are a number and Y is a object. JavaScript string (String) objectA String object is used to process an existing b

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JavaScript is a product that follows the ECMAScript standard, the standard of natural ECMAScript to follow. Let's take a look at the definition and usage of the VAR keyword The Var statement is used to declare a variable. The creation of a JavaScript variable is also called a "declaration" variable: Copy Code code as follows: var carname; Variable is empty (no value) after the variable declaration. To copy the variable, the operation is as follows: Copy Code

Tutorial In ASP, you can invoke the program from VBScript and other means. Instance: Forms using Method= "get" How to use the Request.QueryString command to interact with the user. Forms using Method= "post" How to use the Request.Form command to interact with the user. Forms that use radio buttons How to use Request.Form to interact with the user through radio buttons.

");$result =array_intersect ($a 1, $a 2);Print_r ($result);echo "/*** Array_key_exists ()-Determine if the array key name exists*/function function: Determine whether the specified key name or index exists in the array, only one-dimensional array is applicable.$a =array ("Volvo" = "XC90", "BMW" and "X5");if (array_key_exists ("BMW", $a)) {echo "Key exists! ";} else {echo "key does not exist! ";}echo "/*** Array_merge ()-Merging arrays*/function functi

For ... In declares a loop/iterate operation for an array or an object's properties.1. For an array, iterate over the array element, and for the object, iterate over the object's attributes;var xvar mycars = new Array ()Mycars[0] = "Saab"MYCARS[1] = "Volvo"MYCARS[2] = "BMW"for (x in Mycars){document.write (Mycars[x] + "}The output is:SaabVolvoBMW2. Examples of objects:var obj = {W: "Wen",J: "Jian",B: "Bao"}for (var v in obj) {document.write (v) + "}Th

automatically declared as a global variable.This statement:Carname= "Volvo";A global variable is declared carname, even if it executes within the function.JavaScript operatorsoperator = is used to assign a value.operator + is used to add values.operator = Used to assign a value to a JavaScript variable.The arithmetic operator + is used to add up the value.y=5;z=2;After the above statement is executed, the value of X is 7.JavaScript arithmetic operato

code.GrammarBreak LabelName;Continue labelname;Continue statements (with or without label references) can only be used in loops.The break statement (without a label reference) can only be used in loops or switch.With a label reference, the break statement can be used to jump out of any JAVASCRIPT code block:Instancecars=["BMW", "Volvo", "Saab", "Ford";List{document.write (Cars[0] + "document.write (Cars[1] + "document.write (cars[2] + "Break list;doc

will return a value, and let the function end.function myFunction () { var x=5; return x;}The above function returns the value 5.Example:function MyFunction (b) { return A *b;} document.getElementById ("Demo"). innerhtml= MyFunction (4,3);The InnerHTML of the "demo" element will be: 12You can also use the return statement only if you want to exit the function. The return value is optional:function MyFunction (b) { if (a>b) { return; } x=a+B}If a is greater than B, t

can use local variables with the same name in different functions, because only the function that declares the variable can recognize the variable.As soon as the function is complete, the local variable is deleted.1.4 Global JavaScript variablesVariables declared outside of a function are global variables, and all scripts and functions on a Web page can access it.Lifetime of 1.5JavaScript variablesThe lifetime of JavaScript variables begins at the time they are declared.Local variables are dele

-collar workers, ordinary workers, jobless, high-end business people, etc. Age → Youth (18-30), middle-aged (30-45), middle age (45-60) Region → South, north To draw a relatively accurate consumer group. 3. Analyze the buyer's appeal and consider the selling point Analysis of the different people's consumption psychology, people's needs are different levels, these levels are only met at the bottom level, there will be a higher level of demand, they ar

to the development of Internet applications, but after reading the book, it becomes very clear.1.6 PHP EverywhereUbiquitous is the passionate word that is often used, by July 1999, there will be about 600,000 of Web sites using php,1999 Summer's big development of Linux and open code campaigns is likely to make a breakthrough for the PHP community. You can see its development trend chart on the HTTP://WWW.PHP.NET/USAGE.PHP3 site.In addition, the PHP mailing list receives approximately 80 emails

. Let's see how it works: Console.time (' Timer1 ');var items = [];for (var i = 0; i Items.push ({index:i});}Console.timeend (' Timer1 '); Run produces a result: 6. Get the stack trace information for the function With the JavaScript framework, a lot of code is introduced. Create the view and trigger the event, and finally you want to know the procedure for the function call. Since JavaScript is not a very structured language, it is sometimes difficult to know when something is going on. You ca

Title: There is a table in the system Wcemploy (employee number, name, department name, job, salary)I. Please write out the statement of the building form1 CREATE TABLE Wcemploy (2 int auto_increment PRIMARY KEY, 3 Char (8null,4 Char (+), 5 Char (8), 6 Double 7 )Two. Inserting data1 Insert intoWcemployValues(NULL,'Zhang San','Workshop One','Fitter',6000)2 Insert intoWcemployValues(NULL,'John Doe','Workshop One','Electrician',8000)3 Insert intoWcemployValues(NULL,'Harry','W

, ' Skoda ', 9000);INSERT into Cars VALUES (4, ' Volvo ', 29000);INSERT into Cars VALUES (5, ' Bentley ', 350000);INSERT into Cars VALUES (6, ' Citroen ', 21000);INSERT into Cars VALUES (7, ' Hummer ', 41400);INSERT into Cars VALUES (8, ' Volkswagen ', 21600);COMMIT;BEGIN TRANSACTION;CREATE TABLE Orders (Id integer PRIMARY KEY, orderprice integer CHECK (orderprice>0),Customer text);INSERT into Orders (Orderprice, Customer) VALUES ("Williamson");INSERT

Summary of js Loops There are two types of js native loops: General for loops and for... in loops. There is also a common jQuery. each () loop. I. js native loop. for loop, the Code is as follows: var myArray = [1, 2, 3]; for (var I = 0; I "); I ++;} console: BMW Volvo Saab Forddo-while loop: var x =" "; var I = 0; do {x = x + "the number is" + I +""; I ++; console. log (x);} while (I 　　 A　　 B　　 C $ ("Li "). each (function () {alert ($ (this

://daker.me/assets/images/avatar.png" /> You can also use the prerendering feature to make your website faster. The browser can obtain and render the entire page in the background, and the page will be displayed when the user clicks the corresponding link. The Code is as follows:1 "prerender" href= "http://daker.me/2013/05/hello-world.html" /> 3. Download attributes With the Download attribute of HTML5, developers can Download objects directly instead of downloading objects on a specific page