In js, arrays have many operations, including array creation, sorting, length, value, deletion, access, and other data operation methods. Below I will summarize js Array Operations, for more information, see.
Js array definition:
The Code is as follows:
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Method 1.Var mycars = new Array ()Mycars [0] = "Saab"Mycars [1] = "Volvo"Mycars [2] = "BMW"Method 2.Definition and initialization together:Var mycars = new Array ("Saa
Optional. Comparison functions. If this parameter is omitted, the elements are listed in ascending order of ASCII characters.
Array definition:
Method 1.
Var mycars = new Array ()Mycars [0] = "Saab"Mycars [1] = "Volvo"Mycars [2] = "BMW"
Method 2.
Definition and initialization together:
Var mycars = new Array ("Saab", "Volvo", "BMW ")
Or another method:
Var mycars = ["Saab", "
Arrays are an important data storage type in javascript. Next I will summarize how to create, define, delete, and modify an array length instance in js.
Define an array
The Code is as follows:
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Var a = new Array ("a", "B", "c ");Method 1.Var mycars = new Array ()Mycars [0] = "Saab"Mycars [1] = "Volvo"Mycars [2] = "BMW"
Method 2.
Definition and initialization together:
The Code is as follows:
Copy co
";cars[1]="BMW";cars[2]="Volvo";
Or (condensed array): assign a value when creating an array object.
The Code is as follows:
Var cars = new Array ("Audi", "BMW", "Volvo ");
Or (literal array): it can be used directly without creating variables. However, note that the parentheses () are used to create an object. Instead, brackets ([]) are used to directly assign values. this error is easy if you are not ca
]="Volvo";
Or (condensed array): assign a value when creating an array object.Copy codeThe Code is as follows:Var cars = new Array ("Audi", "BMW", "Volvo ");Or (literal array): it can be used directly without creating variables. However, note that the parentheses () are used to create an object. Instead, brackets ([]) are used to directly assign values. this error is easy if you are not careful.InstanceCopy
(!obj_text.length)//If there is no text box, add a text box so that it can be edited
$ (this). The HTML ("input type=' text ' value='" +$ (This). Text () + "'>");
else//If a text box already exists, display it as a value modified by the text box
$ (this). html (Obj_text.val ());
});
$ (this). Parent (). Siblings ("TD."). 1-item ' "). each (function () {//Gets the other cells of the current row
Obj_text = $ (this). Find ("select"); Determine if a text box is in the cell
if (!obj_t
1 // Echo's notation 2 Echo "5 + ten =" . " ; 3 Echo "5+10 ; 4 Echo "5+10 = {$a} In PHP, there are three types of arrays:
Indexed array-an array with a numeric index
Associative array-An array with the specified key
Multidimensional arrays-An array that contains one or more arrays
PHP indexed ArrayThere are two methods of creating an indexed array:Indexes are automatically assigned (index starting from 0):$cars=array("Volvo", "B
following example shows how to use the echo command to display strings and variables:$txt 1= "Learn PHP";$txt 2= "w3school.com. cn"; $cars =array ("Volvo", "BMW", "SAAB");echo $txt 1;echo "echo "Study PHP at $txt 2";echo "My car is a {$cars [0]}";?>PHP Print StatementPrint is also a language structure and can be used with or without parentheses: print or print (). Display stringThe following example shows how to use the Print command to display diffe
Array definitionWe use the keyword new to create an array object. The following code defines an array object named MyArray:
The Var myarray=new array () has two methods of assigning values to an array (you can add as many values as you want, as you can define any number of variables you need).
1:
The code is as follows
Copy Code
var mycars=new Array ()mycars[0]= "Saab"mycars[1]= "Volvo"mycars[2]= "BMW" can also use an in
JS array use method and example tutorialDefining arraysAn array object is used to store a series of values in a separate variable name.
We use the keyword new to create an array object. The following code defines an array object named MyArray:
The Var myarray=new array () has two methods of assigning values to an array (you can add as many values as you want, as you can define any number of variables you need).
1:var mycars=new Array ()mycars[0]= "Saab"mycars[1]= "
Reprint Address: http://blog.csdn.net/wangyuchun_799/article/details/38460515
Introduction
The main purpose of this article is to explain the mixed use of JavaScript arrays and objects, because of the weak check characteristics of JS, so in the JS array can store different types of variables, such as you can put numbers, strings, characters, objects and other content in the same array. objects can do the same thing, except that an object can specify an alias for each member of the object, so th
The article is mainly about how to define the array, as well as the dynamic modification of the length of the data.
JS Array Assignment
var myarray = [];
Myarray[myarray.length] = ' new element ';
Modify JS Array length
var myarray = [1,2,3];
Myarray.length//3
Myarray.length = 2; Delete the last element
Myarray.length =//Add elements to the array; The elements have the undefined value.
Defining arrays
An array object is used to store a series of values in a sepa
The main purpose of this article is to explain the mixed use of JavaScript arrays and objects, because of the weak check characteristics of JS, so in the JS array can store different types of variables, such as you can put numbers, strings, characters, objects and other content in the same array. objects can do the same thing, except that an object can specify an alias for each member of the object, so that the data is easier to read when programming, such as:
var arr1 = ["Flying Fish",
为文本来处理。1.1.6, semicolon??分号用于分隔 JavaScript 语句。??通常我们在每条可执行的语句结尾添加分号。??使用分号的另一用处是在一行中编写多条语句。1.2, variable 1.2.1, variable use声明(创建) JavaScript 变量var carname;变量赋值 carname="Volvo";例, 标签页需要在script之上 1.2.2, variable naming rules1. Camel Marking method?? The first letter is lowercase, and the next letter begins with an uppercase character. For example:?? ?? var mytestvalue = 0, Mysecondvalue = "HI";2. Pascal Marking method?? The first letter is capitali
!Compare for And whileIf you have read the previous chapter about the for loop, you will find that the while loop is much like the for loop.For statement instanceThe loop in this example uses a for loop to display all the values in the cars array:cars=["BMW", "Volvo", "Saab", "Ford";var i=0;for (; Cars[i];){document.write (Cars[i] + "i++;}While statement instanceThe loop in this example uses a while loop to display all the values in the cars array:car
1.JavaScript Strings (String) objectA String object is used to handle an existing block of characters.1.1 JavaScript stringA string is used to store a series of characters like "John Doe".A string can use either single or double quotation marks:var carname="Volvo XC60"; var carname='Volvo XC60';You use the location (index) to access any character in the string:var character=carname[7];The index of the strin
var carname= "Volvo"; var carname;The value of the variable is not changed after re-declaring the variable, and here is the Volvovar carname= "Volvo";d Ocument.getelementbyid ("Demo"). Innerhtml=carname;Change the value of a paragraph elementIf document.write is executed after the document has finished loading, the entire HTML page will be overwritten:JavaScript Learning Essays
first of all, let's talk about why digital photos are late. Many photography beginners feel that the better the camera, the less the later, the better the photographer's shooting technology is not needed later, in fact, these two views are not entirely correct. Mainly due to the digital camera photosensitive principle of congenital deficiencies, electronic sensors in terms of latitude do not compare with the chemical film, it is often felt that digital photos are often not enough real, lack of l
PHP-sorting functions for arraysIn this section, we will learn the following PHP array sorting functions:Sort ()-sorts an array in ascending orderRsort ()-sorts the array in descending orderAsort ()-sorts associative arrays in ascending order based on valuesKsort ()-Sorts the associative array in ascending order, based on the keyArsort ()-sorts associative arrays in descending order by valueKrsort ()-Sorts the associative array in descending order, based on the keySorting an array in ascending o
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