JavaScript code must be executed through the html/xhtml document, and the first way is to put the JS code between the to put the , allowing the browser to load the page fasterPS: Browser page load order: Please read this articleJS Note: 1,///2,/* 3, JS can be used JS allows programmers to directly assign values to variables without prior declaration, the most efficient declaration and assignment practices: var mood= "Happy", age=33;JS is a weakly typed language, meaning that programmers can cha
() { if(document.getElementById) { statements using getElementById }} Although it is a simple if statement, it ensures that the "old" browsers do not cause problems with my scripting code, so that the script has good backwards compatibility.Browser sniffing technology: addresses backward compatibility issues by extracting information from a browser vendor.Performance considerations: Determining the optimal performance of script execution1. Minimize access to the DOM and minimize markup2. M
The Style property is an object and can only return inline styles.When you need to reference a CSS property with a minus sign in the middle, the DOM asks for the hump naming method, that is, the CSS property font-family becomes the DOM attribute fontFamliy:element.style.fontFamilyRegardless of the number of hyphens in the CSS style attribute's name, the DOM is all represented by the Hump naming method, which is the CSS property backg-color corresponding to the DOM attribute backgroundcolor.CSS3
content "Hello world" is created.InsertBefore: Insert a new element in front of an existing element, when calling this method, you must know three things: 1, new element: The element you want to insert (newelement) 2, Target element: Before which element (targetelement) you want to insert this new element 3, parent element: The parent element of the target element (parentelement) Syntax: Patentelement.insertbefore (newelement,targetelement) We don't have to figure out what the parent element is
2.1 tags. If embedded code is included, only the external script file is downloaded and executed, and the embedded code is ignored.2.3 Document ModeThe first two document modes: Promiscuous mode and Standard mode2.4JavaScript Advanced Programming (Third Edition) Chapter II using JavaScript in HTML
to the value of the attribute node. After making changes to the document through SetAttribute, you will still see the value of the property before the change through the browser's view source option to view the document's source code, that is, the changes made by setattribute are not reflected in the source code of the document itself. This "duplicity" phenomenon stems from the DOM's working mode: loading the static content of the document, and then dynamically refreshing, dynamic refresh does
Problem DescriptionBeg sn=2+22+222+...+22 ... A value of 222 (with N 2). For example: 2+22+222+2222+22222 (n=5), n is entered by the keyboard.InputNOutputAndSample Input5Sample Output24690My Code:1#include 2 voidMain ()3 {4 intN,a=2, t,sum=0, I;5scanf"%d",n);6t=A;7 for(i=1; i)8 {9sum=sum+T;Tent=t*Ten+A; One } Aprintf"%d", sum); -}Other code:1#include 2 3 using namespacestd;4 5 intMain ()6 {7 Longsum=0;8 intt=2;9 intN;TenCin>>N; One for(intI=0; ii) A { -Sum + =T;
1, P103A directory scanner. #include 2, P112Use the MMAP function program to modify the contents of the file, map the file to memory, and change it as an array!#include The exercises in the third chapter of the fourth edition of Linux programming
1, P128A program that gets the date-time format to get the date of the time.#include 2, P130, 132A program that creates temporary files, obtains user information, and outputs logs.#include 3, P141A resource that restricts the CPU consumption of the program.#include "Fourth edition of Linux Programming", chapter Fourth of the exercises
Sixth. Referencing an array to process bulk data1. Definition of array: type-character array-name [constant-expression]1) define an array in the main function, the constant expression cannot contain the variableint a[3+5]; // Legal int N; int a[n]; // Not legal2) in the function being called, the length can be a variable or a very expressive expressionvoid int N) { int a[2// Legal, because the value of n is constant when executing a function }3) in the C language, the array name repr
array. This method has no return value.
Map (): Each item in the array is a given function that returns an array of the results of each function call.
Some (): Runs the given function for each item in the array, and returns True if the function returns true for either item.
1 var numbers = [1,2,3,4,5,4,3,2,1];2 3 var everyresult = numbers.every (function (item, index, array) {4 return (item > 2);5 });6 7 alert (Everyresult); False8 9 var someresult = num
The title description has n integers, so that the previous number in the order to move backward m position, the last m number into the front number of m, see figure. Write a function: To achieve the above function, in the main function input n number and output adjusted n number. Enter the number of input data n n integer moved position m output moving N number sample input101 2 3 4 5 6 7 8 9 102Sample output1#include 2 #defineN 1003 4 //Move Once5MoveintA[],intN)6 {7 intI, temp = a[n-1];8
The title describes the value of sn=1!+2!+3!+4!+5!+...+n!, where n is a number. Input n output and sample input5Sample output1531#include"stdio.h"2 3 intMainintargcChar Const*argv[])4 {5 6 inti, N;7 Long Long intSn =0, factor =1;8scanf"%d", n);9 Ten for(i =1; I ) One { ASn + =factor; -Factor = factor * (i +1); - } the -printf"%lld\n", Sn); - return 0; -}1014 C Language Programming Tutorial (third
The title describes the print out of all "daffodils", the so-called "Narcissus number" refers to a three-digit number, the number of its members of the cubic and equal to that of itself. For example: 153 is a narcissus number, because 153=1^3+5^3+3^3. Output:Input no output All narcissus number, from small start. One per line1#include 2 3 intMainintargcChar Const*argv[])4 {5 inti;6 for(i = -; I +; i++)7 {8 intGE = i%Ten;9 intBai = I/ -;Ten intShi = (I/Ten) %
Title Description Enter a line of characters, respectively, the number of letters, numbers, spaces and other characters. Input line character output statistic sample inputaklsjflj123 sadf918u324 asdf91u32oasdf/. '; 123Sample output23 16 2 41#include"stdio.h"2 3 intMainintargcChar Const*argv[])4 {5 Chars[Bayi];6 intI, Char_count =0, Num_count =0, Space_count =0, Other_count =0;7 //scanf ("%s", s);8 gets (s);9 Ten for(i =0; S[i]! =' /'; i++) One { A if(S[i] >='A' S[i]
The title description writes a function, entering a four-digit number, which requires the output of these four numeric characters, but spaces between each of the two digits. If you enter 1990, you should output "1 9 9 0". Enter a four-digit output to increase the space output sample input1990Sample output1#include 2 3 voidFuncintN)4 {5 intGE = nTen;6 intQian = n/ +;7 intBai = (N-qian * +) / -; 8 intShi = (N-qian * +-Bai * -) /Ten; 9 Tenprintf"%d %d%d%d\n", Qian, Bai, Shi, ge); On
integer (depending on the case, usually 1)
fromCharCode (), receives one or more character encodings, converts to strings, and performs the opposite operation with charCodeAt ()
URI (Universal Resource Identifier)
Methods: Encodeuri,encodeuricomponent,decodeuri,decodeuricomponent, encoding and decoding, decoding methods can only identify their corresponding coding methods
Eval (), converts the string parameter that is brought into the executable statement and inserts it into the current pos
method is actually a property, Just the value type of the attribute is a function, we also call it a method:
Category
Properties/Methods
Description
Property
Constructor
Point to the function used to create the current object
Method
hasOwnProperty (PropertyName)
Checks whether the given property is in the current object instance
propertyIsEnumerable (PropertyName)
Checks whether a given property can be enumerated by
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